December weather forecast
Brighton, CO

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Trees on partly frozen lake water in Barr Lake State Park in Brighton, Colorado
Trees on partly frozen lake water in Barr Lake State Park in Brighton, Colorado

Weather in December

December holds the reigns of winter weather, carrying the coldest conditions of the year in Brighton. One of the coldest temperatures marked in December is 21.2°F (-6°C), adding to the freezing charm. Observably, the city sees minimal rainfall, recording the lowest at 0.12" (3mm). The daylight hours reach their shortest measurement, bringing the year to a close on a wintry note. December transforms Brighton into a winter paradise, blanketed in snow and lit up with holiday festivity.

Temperature

December is the coldest month, exhibiting average temperatures of 40.8°F (4.9°C) at the peak and 21.2°F (-6°C) at the base.

Humidity

The average relative humidity in December is 62%.

Rainfall

The month with the least rainfall is December, when the rain falls for 2.6 days and typically collects 0.12" (3mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. In Brighton, in December, during 4.5 snowfall days, 0.75" (19mm) of snow is typically accumulated. In Brighton, during the entire year, snow falls for 30.9 days and aggregates up to 11.42" (290mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:02 am and sunset at 4:34 pm. On the last day of December, sunrise is at 7:20 am and sunset at 4:44 pm MST.

Sunshine

The average sunshine in December is 6.8h.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: During December, 2 as the daily maximum UV index converts into the following advice:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Updated: Jul 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What part of the year is the coldest?

In Brighton, the average lowest temperatures are observed in December, with a high of 40.8°F (4.9°C) and a low of 21.2°F (-6°C).

How cold is December?

In December, the average high-temperature and low-temperature are 40.8°F (4.9°C) and 21.2°F (-6°C) respectively. The average heat index (a.k.a. 'felt air temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, in August is computed to be 87.8°F (31°C).

What is the average humidity in December?

The average relative humidity in December is 62%.

What is the driest month?

December is the month with the least rainfall in Brighton. Rain falls for 2.6 days and accumulates 0.12" (3mm) of precipitation.

How many days does it rain in December?

In Brighton, during December, the rain falls for 2.6 days and regularly aggregates up to 0.12" (3mm) of precipitation.

How many days does it snow in December?

In Brighton, Colorado, in December, snow falls for 4.5 days, with typically accumulated 0.75" (19mm) of snow.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 24min of daylight.

What is the average length of the day in December?

In Brighton, the average day length in December is 9h and 23min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:02 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 4:44 pm MST.

How long on average sun shines in December?

In December, the average sunshine duration is 6.8h.

When is the lowest UV index?

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

How high is the UV index in December?

In Brighton, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a minimal hazard to health 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
Brighton, CO

Average temperature in December - Brighton, CO
  • Average high temperature in December: 40.8°F

The warmest month (with the highest average high temperature) is July (88.9°F).
The month with the lowest average high temperature is December (40.8°F).

  • Average low temperature in December: 21.2°F

The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is December (21.2°F).

Average pressure in December
Brighton, CO

Average pressure in December - Brighton, CO
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

Average wind speed in December
Brighton, CO

Average wind speed in December - Brighton, CO
  • Average wind speed in December: 6mph

The windiest month (with the highest average wind speed) is April (7.5mph).
The calmest month (with the lowest average wind speed) is December (6mph).

Average humidity in December
Brighton, CO

Average humidity in December - Brighton, CO
  • Average humidity in December: 62%

The months with the highest relative humidity are January and February (64%).
The month with the lowest relative humidity is August (40%).

Average rainfall in December
Brighton, CO

Average rainfall in December - Brighton, CO
  • Average rainfall in December: 0.12"

The wettest month (with the highest rainfall) is May (0.98").
The driest month (with the least rainfall) is December (0.12").

Average rainfall days in December
Brighton, CO

Average rainfall days in December - Brighton, CO
  • Average rainfall days in December: 2.6 days

The month with the highest number of rainy days is May (10.8 days).
The month with the least rainy days is December (2.6 days).

Average snowfall in December
Brighton, CO

Average snowfall in December - Brighton, CO
  • Average snowfall in December: 0.75"

The month with the highest snowfall is February (1.89").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Brighton, CO

Average snowfall days in December - Brighton, CO
  • Average snowfall days in December: 4.5 days

The month with the highest number of snowfall days is February (6.8 days).
The months with the least snowfall days are June, July and August (0 days).

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

Average daylight in December / Average sunshine in December - Brighton, 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 24min).

  • Average sunshine in December: 6h and 5min

The months with the most sunshine are June and July (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 6h and 36min).

Average sunshine days in December
Brighton, CO

Average sunshine days in December - Brighton, CO
  • Average sunshine days in December: 25.8 days

The month with the most sunshine days is December (25.8 days).
The month with the least sunshine days is July (14.8 days).

Average UV index in December
Brighton, CO

Average UV index in December - Brighton, 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).

Average cloud cover in December
Brighton, CO

Average cloud cover in December - Brighton, CO
  • Average cloud cover in December: 25

The month with the most cloud cover is April (Cloud cover 28).
The months with the least cloud cover are June, August and September (Cloud cover 16).

Average visibility in December
Brighton, CO

Average visibility in December - Brighton, 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).

Brighton, Colorado, USA

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