December weather forecast
Sterling, CO

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Weather in December

Sterling, Colorado retreats into the heart of winter in December. The city wears a white blanket with an average snowfall of 1.38" (35mm) distributed over 6.4 days. Despite the chill, the sunshine manages to peek through with an average duration of 6.5 hours per day. The weather exhibits a typical cold winter ambiance with high humidity and significantly lower temperatures than November. The frosty climatic conditions encapsulate the city's charm, making Sterling a delightful winter wonderland.

Temperature

With an average high-temperature of 37.8°F (3.2°C) and an average low-temperature of 23°F (-5°C), December is the coldest month.

Humidity

In Sterling, the average relative humidity in December is 64%.

Rainfall

In Sterling, in December, during 4.6 rainfall days, 0.39" (10mm) of precipitation is typically accumulated. Throughout the year, there are 123.2 rainfall days, and 15.39" (391mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Sterling are January through May, October through December. In Sterling, during December, snow falls for 6.4 days and regularly aggregates up to 1.38" (35mm) of snow. In Sterling, during the entire year, snow falls for 34.4 days and aggregates up to 12.13" (308mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 18min of daylight.
On the first day of December in Sterling, sunrise is at 6:57 am and sunset at 4:26 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 4:35 pm MST.

Sunshine

In Sterling, the average sunshine in December is 6.5h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: In December, the maximum UV index of 2 suggests these recommendations:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
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Frequently asked questions

What is the coldest time of year in Sterling?

December, with its average high-temperature of 37.8°F (3.2°C) and an average low-temperature of 23°F (-5°C), holds the record as the coldest month in Sterling.

How cold is December in Sterling?

During December, Sterling experiences an average high-temperature of 37.8°F (3.2°C) and a low-temperature of 23°F (-5°C). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines air temperature and relative humidity, in August is appraised at 87.8°F (31°C).

What is the average humidity in December in Sterling?

In December, the average relative humidity in Sterling, Colorado, is 64%.

How much does it rain in Sterling in December?

In Sterling, Colorado, in December, during 4.6 rainfall days, 0.39" (10mm) of precipitation is typically accumulated.

How much does it snow in Sterling in December?

In Sterling, in December, during 6.4 snowfall days, 1.38" (35mm) of snow is typically accumulated.

What is the month with the shortest days in Sterling?

The month with the shortest days is December, with an average of 9h and 18min of daylight.

What is the average length of the day in December in Sterling?

The average day length in December in Sterling is 9h and 19min.

When are sunrise and sunset in December in Sterling?

On the first day of December in Sterling, Colorado, sunrise is at 6:57 am and sunset at 4:26 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 4:35 pm MST.

How long on average sun shines in December in Sterling?

In December, the average sunshine duration is 6.5h.

What are the months with the lowest UV index in Sterling?

The months with the lowest UV index in Sterling are January, February, November and December, with an average maximum UV index of 2.

What is the UV index intensity in December in Sterling?

The average daily maximum UV index in December in Sterling, Colorado, is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Sterling, CO

Average temperature in December - Sterling, CO
  • Average high temperature in December: 37.8°F

The warmest month (with the highest average high temperature) is July (88.5°F).
The month with the lowest average high temperature is December (37.8°F).

  • Average low temperature in December: 23°F

The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is December (23°F).

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Average pressure in December
Sterling, CO

Average pressure in December - Sterling, CO
  • Average pressure in December: 30.1"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.83"Hg).

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Average wind speed in December
Sterling, CO

Average wind speed in December - Sterling, CO
  • Average wind speed in December: 9.7mph

The windiest month (with the highest average wind speed) is April (11.9mph).
The calmest month (with the lowest average wind speed) is August (9mph).

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Average humidity in December
Sterling, CO

Average humidity in December - Sterling, CO
  • Average humidity in December: 64%

The month with the highest relative humidity is January (65%).
The month with the lowest relative humidity is September (47%).

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Average rainfall in December
Sterling, CO

Average rainfall in December - Sterling, CO
  • Average rainfall in December: 0.39"

The wettest month (with the highest rainfall) is May (2.95").
The driest month (with the least rainfall) is January (0.35").

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Average rainfall days in December
Sterling, CO

Average rainfall days in December - Sterling, CO
  • Average rainfall days in December: 4.6 days

The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is February (4.2 days).

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Average snowfall in December
Sterling, CO

Average snowfall in December - Sterling, CO
  • Average snowfall in December: 1.38"

The month with the highest snowfall is February (2.68").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Sterling, CO

Average snowfall days in December - Sterling, CO
  • Average snowfall days in December: 6.4 days

The month with the highest number of snowfall days is February (6.7 days).
The months with the least snowfall days are June, July and August (0 days).

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Average daylight in December /
Average sunshine in December
Sterling, CO

Average daylight in December / Average sunshine in December - Sterling, CO
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in December: 6h and 3min

The months with the most sunshine are June and August (Average sunshine: 11h and 42min).
The month with the least sunshine is February (Average sunshine: 6h and 18min).

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Average sunshine days in December
Sterling, CO

Average sunshine days in December - Sterling, CO
  • Average sunshine days in December: 21.9 days

The month with the most sunshine days is January (22.3 days).
The month with the least sunshine days is July (9.8 days).

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Average UV index in December
Sterling, CO

Average UV index in December - Sterling, CO
  • Average UV index in December: 2

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in December
Sterling, CO

Average cloud cover in December - Sterling, CO
  • Average cloud cover in December: 29

The month with the most cloud cover is February (Cloud cover 33).
The month with the least cloud cover is August (Cloud cover 17).

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Average visibility in December
Sterling, CO

Average visibility in December - Sterling, CO
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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Sterling, Colorado, USA

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