December Weather in Bethlehem, United States

Last updated: February 24, 2025

In Bethlehem, United States, December brings a chill, with maximum temperatures averaging 13°C (56°F) and dipping as low as -30°C (-21°F). The month showcases an average temperature of -6°C (22°F), creating a frosty atmosphere for residents and visitors alike. Rain and snowfall contribute to the region's 100 mm (3.9 in) of precipitation over 15 days, adding to the winter wonderland aesthetic. The humidity level peaks at 85%, enhancing the crispness of the air and making it essential to bundle up during outdoor activities. Despite the cold, December in Bethlehem is a picturesque experience.

December Temperature in Bethlehem

In December, Bethlehem, United States, experiences the onset of winter with notable temperature fluctuations. The month typically sees minimum temperatures dipping to -30°C (-21°F), while average conditions hover around -6°C (22°F), providing a stark contrast to the milder autumn months. Despite these chilly averages, the maximum temperature can reach a pleasant 13°C (56°F), offering brief respites from the cold. This pattern reflects a broader trend of declining temperatures as the year concludes, with December being significantly colder than the preceding months of November and October. As festive lights adorn the town, the crisp winter air encapsulates the spirit of the season, making it a unique time to experience Bethlehem's charm amidst the chill.

December Weather in Bethlehem: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Bethlehem, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec172027405362676558473222
Data source: Temperature data for Bethlehem generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Bethlehem

December in Bethlehem marks a significant point in the precipitation pattern of the year, with an average rainfall of 100 mm (3.9 in) over 15 days. As winter settles in, this month features a blend of chilly air and moisture, contributing to a notable increase in precipitation compared to the drier months of September (69 mm) and October (140 mm). Interestingly, December’s rainfall aligns closely with November’s totals, indicating a persistent trend of dampness as the year concludes. The consistent precipitation days throughout December not only provide necessary moisture but also set the stage for the coming winter months, reinforcing Bethlehem’s climate as a dynamic transition from autumn’s crisp days to the winter chill.

December Precipitation Trends in Bethlehem

The chart displays monthly precipitation patterns in Bethlehem, with values for each month alongside December's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec8685771251041091199169140116100
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Bethlehem

In Bethlehem, December ushers in a humidity level of 85%, mirroring the elevated moisture of the preceding months. As the year winds down, the humidity remains notably high, reflective of winter's chill that often comes with dampness. This trend is consistent, with the winter months from November to February showcasing the highest humidity levels, ranging from 86% to 89%. As the seasons shift toward spring, humidity levels gradually decline, hitting their annual low in June at 72%. The pattern emphasizes a significant correlation between the colder months and increased humidity, creating a unique, atmospheric blend that characterizes Bethlehem's winter climate.

December Average Humidity in Bethlehem

This chart illustrates the average monthly humidity levels in Bethlehem, with December's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how December's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%85%84%78%72%75%74%77%85%86%85%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Bethlehem

In Bethlehem, United States, the UV Index experiences a noticeable decline as winter settles in. Starting the year with a low UV Index of 2 in December, residents can enjoy outdoor activities with a significantly reduced risk of sunburn, as burn time stretches to 45 minutes. This marks a stark contrast to the summer months, where the index peaks at 10 in June, indicating a very high exposure risk and the need for diligent sun protection within just 15 minutes. As the year progresses from the spring months of March through May, the index steadily rises, reaching its peak during the sunniest days. By the end of the year, however, the focus shifts back to safer levels, allowing for more leisurely time spent outdoors with lower sun intensity. For more detailed information about UV levels throughout the year, explore Bethlehem UV Index.

Maximum UV Index Levels in Bethlehem for December

The chart shows the monthly maximum UV Index (UVI) for Bethlehem in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec2468910997532
Data source: Bethlehem December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

December Sunshine in Bethlehem

December in Bethlehem, United States, offers a serene transition into winter with 136 hours of sunshine, a dip from the vibrant autumn months. As the year progresses, daylight varies significantly, beginning with 111 hours in January and peaking in the sun-drenched days of July and August, boasting over 300 hours each month. This trend underscores a gradual increase in sunlight as spring unfolds, with March and May basking in 226 and 250 hours, respectively. November's 151 hours hints at the shorter daylight that December embraces, yet still offers a charming glow amidst the festive atmosphere. Overall, Bethlehem’s annual cycle reveals a warm embrace of sunlight during the summer, tapering into the peaceful, reflective days of winter.

Monthly Sunshine Duration in Bethlehem: December Highlighted

The December sunshine duration represents the total number of hours Bethlehem experiences direct sunlight during the month of December, excluding cloudy or obstructed periods. This chart compares the sunshine duration of December with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec111h154h226h206h250h308h318h322h275h183h151h136h
Data source: Bethlehem December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Bethlehem During December

In Bethlehem, United States, the likelihood of sunny weather in December is relatively low at 26%, making it one of the least sunny months of the year. The trend shows a gradual decline in sunny days as the calendar moves from autumn to winter; for instance, November enjoys a more favorable 45% chance of sunshine, but this drops significantly as December sets in. Comparing December to other months, it stands out with a notably lower chance of sun, particularly when contrasted with the more vibrant possibilities seen in March (46%) and even May (32%). As winter approaches, the trend indicates that residents can expect more overcast days and less radiant sunshine to brighten their month.

Percentage of Sunny Days in December in Bethlehem

The chart illustrates the percentage of sunny days in Bethlehem throughout the year, with December highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Bethlehem experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec28%27%46%30%33%37%22%31%36%29%45%26%
Data source: Bethlehem December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Bethlehem in December

In Bethlehem, United States, December brings the shortest daylight of the year, with only 8 hours of sunshine. This decline falls in line with the winter season, following a gradual decrease from the previous months. After enjoying the longest days in June and July at 15 hours, daylight begins to diminish, reaching 14 hours in May and slowly tapering down to 9 hours by November. The trend clearly highlights how the days shorten significantly as the year draws to a close, emphasizing the contrast between the vibrant longer days of summer and the cozy, introspective winter months. As daylight gradually makes its return in January, residents can look forward to the gradual lengthening of days in the coming months.

Average Daylight Hours in Bethlehem for December

The chart illustrates the variation in daylight duration in Bethlehem throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 17m10h 28m11h 57m13h 29m14h 47m15h 26m15h 5m13h 55m12h 27m10h 55m9h 35m8h 54m
Data source: Bethlehem daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Bethlehem

As December settles in over Bethlehem, United States, residents can expect the wind to pick up slightly, with an average speed of 2.8 m/s (6 mph). This marks a notable increase compared to the somewhat lighter breezes of summer, particularly July and August, when the winds dropped to their calmest at 2.0 m/s (5 mph) and 1.9 m/s (4 mph), respectively. The transition from fall to winter typically brings a more invigorating atmosphere, as seen in the steady increase from November's 2.5 m/s. These December winds offer a gentle reminder of the changing seasons, adding a brisk, refreshing touch to the festive month as families prepare for the holidays. Overall, this trend reflects a gradual rise in wind speeds as colder months approach, inviting residents to embrace the chill with cozy attire and warm gatherings.

Average December Wind Speed in Bethlehem

The chart displays monthly wind speed patterns in Bethlehem, with values for each month shown alongside December's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how December's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec2.32.63.32.82.42.72.01.92.52.22.52.8 m/s
Data source: Bethlehem December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Bethlehem Compares to Other Months

The weather in Bethlehem changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of December's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Bethlehem and find detailed weather information for every month.

In December, temperatures in Bethlehem can drop to a minimum of -30°C (-21°F) and average around -6°C (22°F), with a maximum reaching 13°C (56°F). The month experiences about 100 mm (3.9 in) of precipitation over 15 days, and humidity levels hover around 85%. In contrast, January is slightly colder, with minimum temperatures reaching -31°C (-23°F) and an average of -8°C (17°F), while the maximum is marginally lower at 12°C (54°F). Precipitation decreases to 86 mm (3.4 in) across 12 days, accompanied by a slight increase in humidity to 91%. Overall, January tends to be colder and slightly drier compared to December. For more specifics on January weather, check out Bethlehem weather in January.

Comparing the weather in December and February, December typically experiences colder temperatures, with a minimum of -30°C (-21°F) and an average of -6°C (22°F), while February has slightly milder conditions, with a minimum of -27°C (-16°F) and an average of -7°C (20°F). Both months see relatively similar maximum temperatures, with February peaking at 16°C (62°F) compared to December's 13°C (56°F). Precipitation is somewhat consistent, with December receiving about 100 mm (3.9 in) over 15 days and February having slightly less at 85 mm (3.4 in) over 13 days. Humidity levels also remain high, with December at 85% and February slightly higher at 89%. For more details, you can explore Bethlehem weather in February.

In December, the weather can be quite frigid, with temperatures ranging from a minimum of -30°C (-21°F) to an average of -6°C (22°F), reaching a maximum of 13°C (56°F). The month typically sees about 100 mm (3.9 in) of precipitation over 15 days, with humidity levels hovering around 85%. In contrast, March brings slightly warmer conditions, with temperatures ranging from a minimum of -22°C (-8°F) to an average of -3°C (27°F), reaching a higher maximum of 18°C (65°F). Precipitation decreases to 77 mm (3.0 in) over 11 days, yet the humidity remains consistent at 85%. For more details on weather conditions, check out Bethlehem weather in March.

December and April present markedly different weather conditions. In December, temperatures can plummet to a minimum of -30°C (-21°F), with an average around -6°C (22°F) and a maximum of 13°C (56°F). This month also experiences a substantial amount of precipitation, totaling 100 mm (3.9 in) over approximately 15 days, accompanied by high humidity at 85%. In contrast, April offers a much milder climate, with temperatures ranging from a minimum of -12°C (10°F) to a pleasant average of 4°C (40°F), peaking at 24°C (76°F). Despite slightly increased precipitation in April, at 125 mm (4.9 in) across 16 days, the humidity stays relatively constant at 84%. For more detailed insights on April weather, you can check Bethlehem weather in April.

December and May present stark contrasts in weather conditions. In December, temperatures can plummet to a chilling minimum of -30°C (-21°F), with an average hovering around -6°C (22°F) and a maximum of just 13°C (56°F). This month also experiences substantial humidity at 85% and sees precipitation on about 15 days, totaling around 100 mm (3.9 in). In contrast, May welcomes milder temperatures, with minimums around -3°C (27°F), an average of 12°C (53°F), and a maximum soaring to 31°C (87°F). Although slightly more precipitation is recorded in May—104 mm (4.1 in)—it falls on only 13 days, and the humidity is lower at 78%. The shift from December's frigid embrace to May's warmer climate highlights the seasonal diversity in Bethlehem weather. For more details on May's climate, check Bethlehem weather in May.

December and June present a stark contrast in weather conditions. In December, temperatures can plummet to a chilling minimum of -30°C (-21°F), with an average of -6°C (22°F) and a maximum reaching just 13°C (56°F). The month experiences significant precipitation, totaling around 100 mm (3.9 in) over 15 days, coupled with high humidity at 85%. In contrast, June offers milder temperatures, with a minimum of -1°C (31°F), an average of 17°C (62°F), and a maximum of 31°C (88°F). The precipitation in June is slightly higher at 109 mm (4.3 in) over 12 days, but the humidity is lower at 72%. For a closer look at the weather specifics, check out Bethlehem weather in June.

When comparing December and July in Bethlehem, the contrast is striking. December experiences frigid temperatures, with lows plummeting to -30°C (-21°F) and average highs reaching just 13°C (56°F), accompanied by high humidity levels of 85%. This month also sees considerable precipitation, with around 100 mm (3.9 in) over 15 days. In contrast, July brings warmer, more pleasant weather, featuring minimum temperatures of 7°C (44°F) and average highs soaring to 33°C (91°F). The humidity is relatively lower at 75%, and while it has slightly more precipitation at 119 mm (4.7 in), it falls over just 14 days. For more details on July weather, you can check Bethlehem weather in July.

When comparing the weather between December and August, a stark contrast is evident. December experiences much colder temperatures, with minimums plummeting to -30°C (-21°F) and average temperatures hovering around -6°C (22°F). In contrast, August sees significantly milder conditions, with minimum temperatures of 4°C (40°F) and averages reaching 18°C (66°F). Precipitation levels are relatively similar, with December receiving about 100 mm over 15 days, while August totals around 91 mm across 13 days. Additionally, humidity levels are higher in December at 85% compared to August's 74%, contributing to the chill in the air. For more detailed insights, you can explore Bethlehem weather in August.

In December, weather conditions in Bethlehem are notably colder, with temperatures ranging from a frigid minimum of -30°C (-21°F) to a maximum of 13°C (56°F) and an average temperature of -6°C (22°F). This month experiences significant humidity at 85% and an average precipitation of 100 mm (3.9 in) over 15 days. In contrast, September offers much milder conditions, with temperatures varying from a minimum of -5°C (23°F) to a comfortable maximum of 29°C (85°F), averaging around 15°C (58°F). September also sees less precipitation, totaling 69 mm (2.7 in) over 9 days, coupled with lower humidity at 77%. For more details on September weather, visit Bethlehem weather in September.

In contrast to December, October experiences milder temperatures, with daytime averages around 8°C (47°F) compared to December's average of -6°C (22°F). While both months have similar humidity levels at 85%, October sees a broader temperature range, reaching up to 24°C (76°F) during the day, whereas December's maximum is only 13°C (56°F). Precipitation in October is slightly higher, with 140 mm (5.5 in) over 14 days, compared to December's 100 mm (3.9 in) spread over 15 days. For a closer look at Bethlehem's October weather, you can visit Bethlehem weather in October.

In comparing the weather between November and December, December tends to be significantly colder, with average temperatures dropping to -6°C (22°F) compared to November's average of 0°C (32°F). Although December has slightly less precipitation at 100 mm (3.9 in) compared to November's 116 mm (4.6 in), both months experience precipitation on about 15 days. Humidity levels remain relatively consistent, with December at 85% and November at 86%. This shift towards colder weather in December can make for a stark contrast to the milder conditions of November, as detailed further in this resource: Bethlehem weather in November.

Compare Bethlehem's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Bethlehem

December in Bethlehem brings a notable chill, setting itself apart from the milder months of the year. With average temperatures dipping as low as -6°C (22°F), the biting cold often feels more pronounced than in previous months. In addition, the heightened humidity levels at 85% can make the winter air feel even crisper. Despite the potential for snow and the picturesque winter landscape, precipitation occurs on about 15 days throughout the month, contributing to the overall 100 mm of moisture that many residents prepare for. For anyone looking to understand the broader patterns in weather, be sure to check out Bethlehem Climate.