December Weather in Custer, United States

Last updated: February 24, 2025

In Custer, United States, the weather in December presents a notable contrast, with temperatures ranging from a maximum of 19°C (67°F) to a minimum of -25°C (-13°F), resulting in an average temperature of -2°C (29°F). The month sees 27 mm (1.1 in) of precipitation, occurring on approximately 6 days, contributing to a humidity level of around 75%. This blend of chilly temperatures and moisture creates a defining winter experience, perfect for those who appreciate the serene beauty of the season.

December Temperature in Custer

In Custer, United States, December ushers in the chill of winter with minimum temperatures averaging around -25°C (-13°F), while the mercury typically hovers at an average of -2°C (29°F). As the month progresses, daytime highs can reach up to 19°C (67°F), providing a brief respite from the cold. Compared to previous months, December marks a pronounced drop in temperatures, setting the stage for the deep freeze of January and February. This month acts as a bridge, transitioning from the briskness of late fall to the harsh realities of winter. Despite the cold, December’s sunny days can result in pleasant afternoons, a phenomenon that many locals cherish amid the frosty backdrop.

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

The chart illustrates December temperature patterns in Custer, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec262134395064696659423529
Data source: Temperature data for Custer 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 Custer

In Custer, December marks a transition into the winter months with average precipitation of 27 mm (1.1 in), falling on approximately 6 days. This amount is modest when compared to the wetter months of spring and early summer, particularly April and May, which receive significantly higher totals of 84 mm (3.3 in) and 112 mm (4.4 in) respectively. Nonetheless, December's precipitation contributes to the cumulative annual total, showcasing a consistent trend where precipitation gradually decreases from the peak spring months to the drier winter season. As the year winds down, these wetter spells become less frequent, encouraging a shift towards the tranquility of winter’s embrace, while ensuring that the landscape remains nourished for the coming year.

December Precipitation Trends in Custer

The chart displays monthly precipitation patterns in Custer, 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.
JanFebMarAprMayJunJulAugSepOctNovDec16324884112881147649532327
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in Custer

In December, Custer's humidity levels settle at a moderate 75%, reflecting a slight decrease from the higher mid-year peaks of July and August, which both boast humidity levels of 85%. This month marks a return to more temperate conditions, following a gradual decline from the summer's high humidity through the fall. While January opens the year at a slightly higher 73%, it illustrates a broader trend: Custer experiences its highest humidity during the summer months, peaking in June and July, and consistently shows a pattern of increased moisture levels during spring and summer, before tapering off in the fall and winter months. Overall, December's humidity indicates a comfortable climate, setting the stage for the crispness of winter while still retaining a hint of moisture in the air.

December Average Humidity in Custer

This chart illustrates the average monthly humidity levels in Custer, 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.
JanFebMarAprMayJunJulAugSepOctNovDec73%78%64%66%74%84%85%85%76%71%73%75%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Custer

As December arrives in Custer, the UV Index drops significantly to a moderate 2, signaling a period of lower sun intensity and a low exposure category. This trend marks a shift from the extreme values observed during the summer months, where July and June flaunted an index of 11, demanding a mere 10 minutes of burn time. With the colder months settling in, December's burn time extends to a more forgiving 45 minutes, allowing residents and visitors to enjoy the outdoors with less concern for skin damage. This seasonal pattern underscores the importance of adjusting sun safety measures throughout the year. For more detailed information about UV levels, visit Custer UV Index.

Maximum UV Index Levels in Custer for December

The chart shows the monthly maximum UV Index (UVI) for Custer 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.
JanFebMarAprMayJunJulAugSepOctNovDec356991111108632
Data source: Custer 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 Custer

In Custer, December brings a cozy charm with 211 hours of sunshine, a gentle decline from the 230 hours observed in November. As the year wraps up, the daylight hours gradually diminish, yet they still offer a spirited backdrop against the backdrop of winter scenery. This decrease in sunshine contrasts with the abundant daylight of the summer months, peaking in July and June with 384 and 374 hours, respectively. The trend showcases nature's rhythmic transition, where each season paints the landscape differently — from the sun-drenched days of summer to the quieter, reflective light of December. As the community prepares to embrace the festivities of the holiday season, the softer light of December encourages moments of warmth and togetherness amidst the cooling temperatures.

Monthly Sunshine Duration in Custer: December Highlighted

The December sunshine duration represents the total number of hours Custer 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.
JanFebMarAprMayJunJulAugSepOctNovDec171h217h267h287h305h374h384h355h290h252h230h211h
Data source: Custer December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Custer During December

In Custer, the likelihood of sunny weather in December stands at 46%, a slight dip compared to previous months. As the year progresses, we see a general trend of increasing sunshine, peaking during the summer months of July and August at 62% and 72%, respectively. Following the vibrant summer, there's a gradual decline in sunny days as autumn sets in, with November still holding a respectable 51%. Although December's chances of sun are lower than earlier months, the overall trend suggests a consistent rhythm of sunshine throughout the year, inviting residents and visitors to embrace the beauty of every season—even in the quieter days of winter.

Percentage of Sunny Days in December in Custer

The chart illustrates the percentage of sunny days in Custer 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 Custer experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec49%43%57%47%40%65%62%72%66%60%51%47%
Data source: Custer December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Custer in December

As December arrives in Custer, the daylight hours begin to wane, offering only 8 hours of sunshine—a notable decline compared to the vibrant 15 hours experienced in the peak of June and July. This downward trend in daylight is part of a natural progression throughout the year, with daylight gradually increasing from January’s 9 hours to its peak in the heart of summer, before retracting again as autumn gives way to winter. By the end of the year, the shift becomes most pronounced, highlighting the seasonal rhythm that characterizes Custer's climate. As daylight fades in December, residents experience a cozy ambiance that sets the stage for festive celebrations, even as they eagerly anticipate the gradual return of longer days in the coming months.

Average Daylight Hours in Custer for December

The chart illustrates the variation in daylight duration in Custer throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 19m10h 29m11h 58m13h 28m14h 44m15h 23m15h 2m13h 53m12h 26m10h 56m9h 38m8h 57m
Data source: Custer daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Custer

As December arrives in Custer, the wind begins to pick up, with an average speed of 3.9 m/s (9 mph), the highest of the year. This marks a notable increase from the more tranquil breezes of the summer months, which lingered at a consistent 2.8 m/s (6 mph) from June through September. Following a slight rise in the fall months, where winds edged back up to 3.7 m/s (8 mph) in November, December's gusts signal the onset of winter, bringing both a chill and a spirited energy to the landscape. The trend suggests a transition from the calmer, breezy days of earlier months to the brisk winds that characterize the winter season, inviting both adventure and serenity to Custer's cold, vibrant December.

Average December Wind Speed in Custer

The chart displays monthly wind speed patterns in Custer, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.72.93.43.33.02.82.82.82.83.43.73.9 m/s
Data source: Custer December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Custer Compares to Other Months

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

In December, temperatures in Custer can range from a minimum of -25°C (-13°F) to a maximum of 19°C (67°F), with an average of -2°C (29°F). The month sees about 27 mm (1.1 in) of precipitation across 6 days, with humidity levels around 75%. In contrast, January experiences slightly colder conditions, featuring a minimum temperature of -28°C (-18°F) and a maximum of 15°C (59°F), with an average of -3°C (26°F). Precipitation is reduced to 15 mm (0.6 in) over just 5 days, and humidity remains relatively stable at 73%. For a closer look at January weather specifics, visit Custer weather in January.

December and February present a stark contrast in weather conditions, both characterized by cold temperatures but with some distinct differences. In December, temperatures range from a minimum of -25°C (-13°F) to a milder average of -2°C (29°F), with occasional highs reaching 19°C (67°F). Precipitation is relatively light at 27 mm (1.1 in) over 6 days, with a humidity level of 75%. Conversely, February sees even colder temperatures, with minima dropping to -33°C (-27°F) and an average of -6°C (21°F), while the maximum temperature slightly declines to 17°C (63°F). Precipitation increases to 32 mm (1.3 in) over 7 days, accompanied by a higher humidity of 78%. For more detailed information about February weather, you can check Custer weather in February.

In December, the weather is generally milder compared to March, with average temperatures around -2°C (29°F) and a maximum of 19°C (67°F), although it can drop to -25°C (-13°F) at its lowest. Precipitation in December is relatively low at 27 mm (1.1 in) over about six days, accompanied by a humidity level of 75%. In contrast, March experiences slightly colder average temperatures of 1°C (34°F) with a low of -29°C (-21°F) and a maximum of 22°C (72°F). The month sees increased precipitation, totaling 48 mm (1.9 in) over eight days and lower humidity at 64%. For a more detailed look at the weather conditions in March, you can visit Custer weather in March.

In December, temperatures can plummet to a chilling minimum of -25°C (-13°F), with an average of -2°C (29°F) and a maximum reaching 19°C (67°F). Precipitation is relatively low at 27 mm (1.1 in), occurring over about 6 days, and the humidity stands at a brisk 75%. In contrast, April sees a significant warming trend, with minimum temperatures at -23°C (-10°F) and an average of 4°C (39°F), peaking at a pleasant 25°C (77°F). However, it is also wetter, with precipitation amounting to 84 mm (3.3 in) over approximately 12 days, and humidity dipping to 66%. For more detailed information on April weather, check out Custer weather in April.

December and May present contrasting weather conditions. In December, temperatures can plummet to a minimum of -25°C (-13°F) and typically average around -2°C (29°F), with a maximum reaching 19°C (67°F). The month experiences low precipitation of about 27 mm (1.1 in) over just 6 days, accompanied by a humidity level of 75%. In stark contrast, May brings much milder temperatures, with a minimum of -7°C (19°F) and an average of 10°C (50°F), peaking at a warm 29°C (85°F). May is considerably wetter, accumulating 112 mm (4.4 in) of precipitation over 18 days, while maintaining a similar humidity level of 74%. For more details about the weather during May, you can visit Custer weather in May.

December and June present starkly contrasting weather patterns. In December, temperatures can plummet as low as -25°C (-13°F), with an average around -2°C (29°F) and occasional highs reaching up to 19°C (67°F). This month sees relatively low precipitation at 27 mm (1.1 in) over about 6 days, accompanied by a humidity level of 75%. In contrast, June enjoys a much milder climate, with minimum temperatures of 3°C (38°F) and an average of 18°C (64°F), peaking at a warm 34°C (94°F). Rainfall increases significantly to 88 mm (3.4 in) across approximately 14 days, and the humidity rises to 84%. For a more detailed look at June weather, you can explore Custer weather in June.

December and July present stark contrasts in weather. In December, temperatures can plunge as low as -25°C (-13°F), with an average of -2°C (29°F) and a peak of 19°C (67°F). The month sees relatively light precipitation of 27 mm (1.1 in) over about 6 days, coupled with a humidity level of 75%. In contrast, July boasts significantly warmer temperatures, with a minimum of 7°C (45°F), an average of 20°C (69°F), and soaring up to 35°C (96°F). Rainfall is more abundant during this month, totaling 114 mm (4.5 in) over 16 days, alongside a higher humidity of 85%. For more detailed information on July weather, you can visit Custer weather in July.

In December, temperatures can plunge to a chilling minimum of -25°C (-13°F), with an average of -2°C (29°F) and a maximum reaching up to 19°C (67°F). The month sees relatively low precipitation at 27 mm (1.1 in) over 6 days, accompanied by a humidity level of 75%. In contrast, August boasts much milder conditions, with minimum temperatures around 4°C (40°F) and an average of 19°C (66°F), peaking at a warm 34°C (94°F). However, it experiences more rainfall, totaling 76 mm (3.0 in) spread over 13 days, and slightly higher humidity at 85%. For a closer look at weather specifics, check Custer weather in August.

In comparing the weather of December and September, notable differences arise in both temperature and precipitation. December generally experiences much colder temperatures, with an average of -2°C (29°F) and extremes ranging from -25°C (-13°F) to a maximum of 19°C (67°F). In contrast, September sees a milder climate with an average temperature of 15°C (59°F) and a maximum that can soar to 36°C (97°F). Additionally, precipitation is slightly higher in September, with 49 mm (1.9 in) falling over 8 days, compared to December’s 27 mm (1.1 in) over 6 days. Humidity levels are quite similar between the two months, hovering around 75% in December and 76% in September. For more detailed insights about the weather during this time, check out Custer weather in September.

In comparing December and October weather, we see notable differences in temperature and precipitation. December experiences a broader temperature range, with minimums reaching as low as -25°C (-13°F) and a maximum of 19°C (67°F), resulting in an average of -2°C (29°F). In contrast, October has milder temperatures, with lows around -21°C (-5°F) and highs peaking at 28°C (82°F), averaging at a much warmer 6°C (43°F). Precipitation is also more pronounced in October, totaling 53 mm (2.1 in) over 8 days, compared to December's 27 mm (1.1 in) over just 6 days. Interestingly, humidity levels are slightly higher in December at 75%, compared to October's 71%. For a detailed look at weather patterns, you can explore Custer weather in October.

December weather shows a broader temperature range compared to November, with minimums dipping to -25°C (-13°F) and maximums reaching up to 19°C (67°F). In contrast, November features a milder average temperature, ranging from a minimum of -21°C (-5°F) to a maximum of 24°C (75°F). Precipitation is slightly higher in December at 27 mm (1.1 in) compared to November's 23 mm (0.9 in), with both months experiencing rain on about six days. Humidity also remains relatively consistent, with December at 75% and November at 73%. For a detailed look at November's weather, visit Custer weather in November.

Compare Custer's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Custer

As December settles in, Custer transforms into a winter wonderland, with temperatures dropping significantly compared to the milder months prior. Chilly days dominate the landscape, where the maximum temperature hovers around comfortable levels but dips sharply at night. This month is notably drier than earlier months, with only a handful of precipitation days contributing to the seasonal ambiance, complemented by a brisk 75% humidity that adds to the crisp, fresh feel of the air. If you're curious about how Custer's climate varies across seasons, check out Custer Climate for a deeper insight into this beautiful location's weather patterns.