December weather forecast
Hillside, CO

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Weather in December

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

Temperature

Hillside's December weather comes with a decrease in average high-temperatures, moving from a frosty 48.4°F (9.1°C) in November to an icy 38.3°F (3.5°C). During December, the nighttime temperature averages of 18.5°F (-7.5°C).

Humidity

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

Rainfall

In Hillside, in December, it is raining for 4 days, with typically 0.35" (9mm) of accumulated precipitation. In Hillside, during the entire year, the rain falls for 108.6 days and collects up to 10.83" (275mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In December, it is snowing for 5.5 days. Throughout December, 2.6" (66mm) of snow is accumulated. Throughout the year, there are 38 snowfall days, and 23.94" (608mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 36min of daylight.
On the first day of December, sunrise is at 7:01 am and sunset at 4:42 pm. On the last day of the month, 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

January, February, October through 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 minimal health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: An average maximum UV index of 2 in December leads to these recommendations:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.

Frequently asked questions

How cold is December?

The average high-temperature, in December, in Hillside, is 38.3°F (3.5°C), while the average low-temperature is 18.5°F (-7.5°C). In July, the average heat index (a.k.a. 'feels like', 'real feel'), which represents the influence of relative humidity on air temperature, is calculated to be 82.4°F (28°C).

What is the average humidity in December?

In December, the average relative humidity is 65%.

How many days does it rain in December?

In Hillside, in December, it is raining for 4 days, with typically 0.35" (9mm) of accumulated precipitation.

How much does it snow in December?

In Hillside, in December, during 5.5 snowfall days, 2.6" (66mm) of snow is typically accumulated.

What is the month with the shortest days?

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

What is the average length of the day in December?

The average day length in December is 9h and 34min.

What time are sunrise and sunset in December?

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, sunrise is at 7:19 am and sunset at 4:52 pm MST.

How long on average sun shines in December?

The average sunshine duration in December in Hillside is 7.2h.

When is the lowest UV index?

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

What is the UV index reading in December in Hillside?

In Hillside, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a low health threat 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).

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).

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).

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%).

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").

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).

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").

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).

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).

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).

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).

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).

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).

Hillside, Colorado, USA

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