December Weather in Rockport, United States

Last updated: February 24, 2025

December in Rockport, United States is characterized by a stark contrast in temperatures, with maximums reaching 14°C (58°F) and minimums plummeting to a chilly -14°C (7°F). The month averages around 3°C (38°F), marking a decisive shift into winter. Rainfall is not uncommon, totaling approximately 140 mm (5.5 in) over 10 days, which contributes to a humidity level hovering at 81%. This blend of cool temperatures and precipitation presents a typical yet captivating winter climate for residents and visitors alike, making it an intriguing time to experience the region's seasonal charm.

December Temperature in Rockport

As December rolls in, Rockport experiences a significant drop in temperatures, ushering in the heart of winter. With a minimum temperature of -14°C (7°F) and an average hovering around 3°C (38°F), the month sets a chillier tone compared to the preceding autumn. Daytime highs reach around 14°C (58°F), providing a slight reprieve from the cold, yet the overall climate reflects a trend towards colder conditions that peak in January. This gradual decline from the milder temperatures of November aligns with Rockport’s seasonal shifts, highlighting the stark contrasts characteristic of the region's winter months. As snow may begin to blanket the landscape, December serves as a reminder of nature's cyclical rhythm, inviting residents and visitors alike to embrace the cozy spirit of the season.

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

The chart illustrates December temperature patterns in Rockport, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec343437445261686965574638
Data source: Temperature data for Rockport generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Rockport

December in Rockport brings a notable shift in precipitation, with an average of 140 mm (5.5 in) of rainfall spread over about 10 days. This marks a dip from the more intense October average of 161 mm, yet it still highlights December as a robust month for precipitation compared to the drier summer months. The increase in rainfall as the year draws to a close suggests a climatic transition, setting the stage for winter conditions and reflecting a broader trend of heightened precipitation in the fall and winter seasons. As the landscape shakes off the autumn leaves, the rains of December help nurture the region's resilience heading into the new year.

December Precipitation Trends in Rockport

The chart displays monthly precipitation patterns in Rockport, 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.
JanFebMarAprMayJunJulAugSepOctNovDec891091061569283985486161112140
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in Rockport

In Rockport, the December humidity stands at a comfortable 81%, continuing the trend of higher levels seen in the colder months. As the year progresses from the peak humidity of 86% in January, a gradual decline occurs until it reaches its lowest point in July at 67%. This seasonal shift showcases a significant drop through the warmer months of May to August, where humidity sinks to the mid-60s. Interestingly, as the year wraps up, November experiences an uptick to 84%, indicating a cooling pattern that carries into December. Overall, the humidity levels reveal a clear pattern: a steady decrease in the summer followed by a resurgence in the fall and winter months, creating a refreshing coastal atmosphere during the final stretch of the year.

December Average Humidity in Rockport

This chart illustrates the average monthly humidity levels in Rockport, 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.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%82%80%72%72%67%66%71%79%84%81%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Rockport

In December, Rockport experiences a low UV Index of 2, indicating minimal risk of harm from unprotected sun exposure. With a burn time of 45 minutes, residents and visitors can enjoy the outdoors comfortably, without the urgent need for sunscreen that prevails during the summer months. This marks a significant drop from the very high levels seen in late spring and summer (May through August), where the UV Index typically peaked at 9 or 10. As the year winds down, the trend reflects a gradual decrease in UV radiation, underscoring the importance of seasonal awareness in sun protection. For more insights on UV exposure throughout the year, check out Rockport UV Index.

Maximum UV Index Levels in Rockport for December

The chart shows the monthly maximum UV Index (UVI) for Rockport 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.
JanFebMarAprMayJunJulAugSepOctNovDec2457910997632
Data source: Rockport 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 Rockport

As the year draws to a close, December in Rockport showcases a charming blend of winter serenity and inviting sunshine, offering residents and visitors a cozy glow with 173 hours of sunlight. While this is a dip from the sunlit bounty of summer months—peaking at 342 hours in July—it still holds its own, completing a gentle decline that starts after the rich springtime radiance of 303 hours in May. December's moderate sunshine serves as a beautiful reminder that even in winter, the warmth of the sun can brighten the shorter days, bridging the gap to the invigorating light of the new year.

Monthly Sunshine Duration in Rockport: December Highlighted

The December sunshine duration represents the total number of hours Rockport 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.
JanFebMarAprMayJunJulAugSepOctNovDec148h187h256h247h303h333h342h335h281h229h198h173h
Data source: Rockport December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Rockport During December

In Rockport, December tends to usher in cloudier days, with the probability of sunny weather dipping to just 30%. This marks a notable decline from the sunniest months of March, boasting a 60% chance, and November, which retains a relatively higher 53%. As the year winds down, the trend shows a gradual reduction in sunshine, particularly evident compared to earlier months like September and October, where the chances of sun are higher at 47% and 39%, respectively. This seasonal shift suggests that if you're hoping for bright December days in Rockport, it's best to keep your expectations grounded in the reality of more overcast skies.

Percentage of Sunny Days in December in Rockport

The chart illustrates the percentage of sunny days in Rockport 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 Rockport experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec38%32%60%41%40%41%34%33%47%39%53%30%
Data source: Rockport December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Rockport in December

In Rockport, United States, December ushers in a season of shorter days, mirroring the daylight duration of January with approximately 9 hours of light. As the year progresses, daylight gradually increases, peaking in June at 15 hours, before starting to recede again in the late summer months. This cyclical pattern highlights a transformation from the longer, sun-drenched days of late spring and summer to the more subdued light of winter. By the time December rolls around, the daylight hours have dwindled back to their early-winter levels, inviting cozy indoor activities as the community embraces the shorter days.

Average Daylight Hours in Rockport for December

The chart illustrates the variation in daylight duration in Rockport throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 26m10h 33m11h 57m13h 24m14h 38m15h 14m14h 55m13h 49m12h 26m10h 59m9h 44m9h 5m
Data source: Rockport daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Rockport

As December unfolds in Rockport, the winds begin to pick up, averaging 7.0 m/s (16 mph), making it a brisk and invigorating month. This slight increase from the previous months signals the return of stronger gusts as winter approaches, contrasting with the calmer breezes of mid-summer, where wind speeds dipped to averages of 4.7 m/s (10 mph) in August. Interestingly, December's winds demonstrate a trend of stability, maintaining a consistent flow that echoes the strengths seen earlier in the fall months. Overall, the transition showcases a seasonal shift, inviting both locals and visitors to embrace the winter charm of this coastal gem with its refreshing air and scenic vistas.

Average December Wind Speed in Rockport

The chart displays monthly wind speed patterns in Rockport, 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.
JanFebMarAprMayJunJulAugSepOctNovDec7.27.17.56.26.05.95.04.75.76.56.87.0 m/s
Data source: Rockport December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Rockport Compares to Other Months

The weather in Rockport 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 Rockport and find detailed weather information for every month.

In December, temperatures typically range from a minimum of -14°C (7°F) to a maximum of 14°C (58°F), with an average temperature of 3°C (38°F). This month sees a significant amount of precipitation, measuring around 140 mm (5.5 in) over approximately 10 days, while the humidity levels average at 81%. In contrast, January experiences slightly colder temperatures, with a minimum of -16°C (4°F) and an average of 1°C (34°F), although it retains the same maximum of 14°C (58°F). Precipitation decreases to 89 mm (3.5 in) over 9 days, and humidity rises to an average of 86%. For more detailed information, you can check Rockport weather in January.

December and February both experience chilly temperatures, but December tends to be slightly warmer on average, with an average temperature of 3°C (38°F) compared to February's 1°C (35°F). The minimum temperatures are quite similar, averaging -14°C (7°F) in December and -13°C (9°F) in February. Both months see a fair amount of precipitation, with December receiving 140 mm (5.5 in) over about 10 days, while February has 109 mm (4.3 in) spread across 11 days. Humidity levels are also comparable, with December at 81% and February slightly higher at 84%. For more detailed insights into the weather conditions in February, you can visit Rockport weather in February.

In comparing the weather between December and March, both months exhibit similar average temperatures, hovering around 3°C (38°F). December experiences slightly lower minimum temperatures, dipping to -14°C (7°F), while March has a minimum of -11°C (12°F). Precipitation is also noteworthy, with December receiving 140 mm (5.5 in) and March slightly less at 106 mm (4.2 in), although both months have precipitation on about 10 days. Humidity levels remain comparable as well, with December at 81% and March at 82%. For a detailed look at March weather specifics, you can refer to Rockport weather in March.

When comparing the weather in December and April, notable differences emerge. December typically experiences colder temperatures, with a minimum of -14°C (7°F) and an average around 3°C (38°F), while April sees milder conditions, with minimums around -1°C (31°F) and an average of 7°C (44°F). Precipitation levels are relatively similar, with December receiving around 140 mm (5.5 in) over approximately 10 days, compared to April's 156 mm (6.1 in) over 13 days. Humidity remains fairly consistent between the two months, at 81% for December and 80% for April. For more detailed insights into April's climate, check out Rockport weather in April.

In December, temperatures can drop significantly, with a minimum reaching as low as -14°C (7°F) and an average around 3°C (38°F), compared to May, where the minimum is a milder 3°C (39°F) and the average rises to 11°C (52°F). December experiences higher precipitation levels at 140 mm (5.5 in) over 10 days, while May sees less, with only 92 mm (3.6 in) over the same number of days. Furthermore, humidity is noticeably higher in December at 81%, compared to May's more comfortable 72%. For those interested in more details about May weather, you can visit Rockport weather in May.

December and June present stark contrasts in weather conditions. In December, temperatures can drop as low as -14°C (7°F) with an average temperature around 3°C (38°F), while June offers a milder climate with temperatures starting at a minimum of 9°C (49°F) and peaking at 23°C (73°F). Precipitation levels also vary, with December experiencing 140 mm (5.5 in) of rain over about 10 days, compared to June's 83 mm (3.3 in) spread over 9 days. Additionally, December's higher humidity at 81% contrasts with June's relatively comfortable 72%. For more detailed insights, visit Rockport weather in June.

When comparing the weather in December and July, notable differences emerge in both temperature and humidity levels. December experiences a starkly colder climate, with average temperatures hovering around 3°C (38°F), and dipping as low as -14°C (7°F) at times. In contrast, July showcases a much warmer atmosphere, with average temperatures around 20°C (68°F) and highs reaching up to 27°C (81°F). Additionally, December sees higher humidity at 81% compared to 67% in July. Precipitation is fairly consistent, with both months experiencing rain on about 10 days, though December tends to have slightly more overall precipitation at 140 mm (5.5 in) compared to July's 97 mm (3.8 in). For more details on the weather in July, you can explore Rockport weather in July.

December and August present stark contrasts in weather conditions. In December, temperatures can plunge as low as -14°C (7°F) at night, with an average temperature of around 3°C (38°F) and daytime highs reaching up to 14°C (58°F). This month typically experiences 140 mm (5.5 in) of precipitation over about 10 days, accompanied by high humidity at 81%. In contrast, August offers a warm and pleasant climate, with nighttime lows around 16°C (61°F) and average temperatures peaking at 21°C (70°F) during the day, with maximums hitting 27°C (81°F). The total precipitation in August is significantly lower at 54 mm (2.1 in), spread over just 7 days, and the humidity is more comfortable at 66%. For a closer look at weather specifics during this month, visit Rockport weather in August.

In December, temperatures can drop significantly, with a minimum of -14°C (7°F) and an average of 3°C (38°F), while September enjoys milder conditions, ranging from a minimum of 12°C (54°F) to a maximum of 25°C (77°F). Precipitation is also more frequent in December, with about 140 mm (5.5 in) spread over 10 days, compared to the 86 mm (3.4 in) experienced in September over just 7 days. Furthermore, humidity levels are higher in December at 81%, while September has a more comfortable humidity of 71%. For more detailed information on September weather, you can refer to Rockport weather in September.

December and October weather show distinct contrasts. In December, temperatures can plummet to a minimum of -14°C (7°F), with an average of around 3°C (38°F) and a maximum of 14°C (58°F). The month tends to be quite wet, receiving about 140 mm (5.5 in) of precipitation over 10 days, accompanied by high humidity levels of 81%. In contrast, October experiences milder temperatures, ranging from a minimum of 3°C (38°F) to a maximum of 21°C (69°F), with an average temperature of 14°C (57°F). Rainfall is slightly higher at 161 mm (6.3 in) over 13 days, but the humidity is slightly lower at 78%. For more details on October weather, check Rockport weather in October.

In December, temperatures tend to drop significantly compared to November, with a minimum of -14°C (7°F) and an average of 3°C (38°F), whereas November offers a milder minimum of -9°C (16°F) and an average of 8°C (46°F). The maximum temperatures in December reach 14°C (58°F), which is slightly lower than November's peak of 18°C (65°F). Precipitation also increases in December, totaling 140 mm (5.5 in) over 10 days, compared to November's 112 mm (4.4 in) across 11 days. Humidity remains relatively high in both months, with December at 81% and November at 84%. For more detailed information about November weather, check out Rockport weather in November.

Compare Rockport's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Rockport

As December unfolds in Rockport, the weather showcases a marked shift from the milder months, making way for a chillier ambiance that often envelops the town. Daytime temperatures can reach a comfortable high, but nights turn brisk, with lows plunging into icy territory. While precipitation lingers in the air, it contributes to the stark beauty of the season, with a significant portion of the month marked by rainy days. The average humidity hovers at a notable level, further emphasizing the crispness of the winter air. Overall, December’s climate offers a distinct contrast to the warmer months, inviting residents and visitors alike to embrace the unique character of Rockport’s winter wonderland. For more insights into the local weather patterns throughout the year, visit Rockport Climate.