December weather forecast
Hillside, CO

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Weather in December

December, the first month of the winter in Hillside, is also an icy month, with an average temperature ranging between max 38.3°F (3.5°C) and min 18.5°F (-7.5°C).

Temperature

The onset of December is marked by a decrease in temperature, transitioning from a chilly 48.4°F (9.1°C) in November to a wintry 38.3°F (3.5°C). The low-temperature averages to a subzero cold 18.5°F (-7.5°C) during the nights of December.

Humidity

In December, the average relative humidity in Hillside is 65%.

Rainfall

In December, in Hillside, the rain falls for 4 days. Throughout December, 0.35" (9mm) of precipitation is accumulated. Throughout the year, there are 108.6 rainfall days, and 10.83" (275mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Hillside, Colorado, are January through May, October through December. In Hillside, Colorado, in December, during 5.5 snowfall days, 2.6" (66mm) of snow is typically accumulated. In Hillside, during the entire year, snow falls for 38 days and aggregates up to 23.94" (608mm) of snow.

Daylight

With an average of 9h and 36min of daylight, December has the shortest days of the year in Hillside.
On the first day of the month, sunrise is at 7:01 am and sunset at 4:42 pm. On the last day of December, in Hillside, sunrise is at 7:19 am and sunset at 4:52 pm MST.

Sunshine

In Hillside, the average sunshine in December is 7.2h.

UV index

The months with the lowest UV index are January, February, October through December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: An average maximum UV index of 2 in December leads to these recommendations:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. During bright days, sunglasses that offer UVA and UVB defense are recommended. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.
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Frequently asked questions

How cold is it in Hillside in December?

In December, the average high-temperature and low-temperature are 38.3°F (3.5°C) and 18.5°F (-7.5°C) respectively. The average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines relative humidity and air temperature, in July is appraised at 82.4°F (28°C).

What is the average humidity in December in Hillside?

The average relative humidity in December in Hillside, Colorado, is 65%.

How many days does it rain in December in Hillside?

In December, in Hillside, the rain falls for 4 days. Throughout December, 0.35" (9mm) of precipitation is accumulated.

How much does it snow in Hillside in December?

In Hillside, in December, snow falls for 5.5 days, with typically accumulated 2.6" (66mm) of snow.

What is the month with the shortest days in Hillside?

December has the shortest days of the year in Hillside, with an average of 9h and 36min of daylight.

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

In Hillside, Colorado, the average day length in December is 9h and 34min.

When is the sunrise / sunset in December in Hillside?

In December, on the first day of the month, sunrise is at 7:01 am and sunset at 4:42 pm. On the last day of the month, in Hillside, sunrise is at 7:19 am and sunset at 4:52 pm MST.

How many hours of sunshine does Hillside have in December?

In December, the average sunshine duration in Hillside is 7.2h.

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

January, February, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Hillside, Colorado.

What is the UV index intensity in December in Hillside?

The average daily maximum UV index in December is 2. A UV Index estimate 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
Hillside, CO

Average temperature in December - Hillside, CO
  • Average high temperature in December: 38.3°F

The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (37°F).

  • Average low temperature in December: 18.5°F

The month with the highest average low temperature is July (55.8°F).
The coldest month (with the lowest average low temperature) is December (18.5°F).

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Average pressure in December
Hillside, CO

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

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is April (29.91"Hg).

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Average wind speed in December
Hillside, CO

Average wind speed in December - Hillside, CO
  • Average wind speed in December: 7.4mph

The windiest months (with the highest average wind speed) are January, February and March (7.5mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).

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Average humidity in December
Hillside, CO

Average humidity in December - Hillside, CO
  • Average humidity in December: 65%

The months with the highest relative humidity are January and February (69%).
The month with the lowest relative humidity is June (40%).

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Average rainfall in December
Hillside, CO

Average rainfall in December - Hillside, CO
  • Average rainfall in December: 0.35"

The wettest month (with the highest rainfall) is July (2.2").
The driest months (with the least rainfall) are January and November (0.31").

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Average rainfall days in December
Hillside, CO

Average rainfall days in December - Hillside, CO
  • Average rainfall days in December: 4 days

The month with the highest number of rainy days is July (19.5 days).
The month with the least rainy days is November (2.7 days).

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Average snowfall in December
Hillside, CO

Average snowfall in December - Hillside, CO
  • Average snowfall in December: 2.6"

The month with the highest snowfall is February (5.63").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Hillside, CO

Average snowfall days in December - Hillside, CO
  • Average snowfall days in December: 5.5 days

The month with the highest number of snowfall days is February (8.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Hillside, CO
  • Average daylight in December: 9h and 4min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in December: 7h and 1min

The month with the most sunshine is June (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 7h and 0min).

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Average sunshine days in December
Hillside, CO

Average sunshine days in December - Hillside, CO
  • Average sunshine days in December: 23.8 days

The month with the most sunshine days is November (24.7 days).
The month with the least sunshine days is July (4.7 days).

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Average UV index in December
Hillside, CO

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

The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, October, November and December (UV index 2).

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Average cloud cover in December
Hillside, CO

Average cloud cover in December - Hillside, CO
  • Average cloud cover in December: 20

The months with the most cloud cover are February and April (Cloud cover 23).
The months with the least cloud cover are June, September, October and November (Cloud cover 14).

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Average visibility in December
Hillside, CO

Average visibility in December - Hillside, 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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Hillside, Colorado, USA

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