December weather forecastNiwot, CO
December
Weather in December
December, the first month of the winter in Niwot, is also a wintry month, with an average temperature ranging between max 39°F (3.9°C) and min 19.9°F (-6.7°C).Temperature
During the coldest month, December, temperatures average a high of 39°F (3.9°C) and a low of 19.9°F (-6.7°C).Humidity
In Niwot, Colorado, the average relative humidity in December is 63%.Rainfall
In Niwot, during December, the rain falls for 4.7 days and regularly aggregates up to 0.39" (10mm) of precipitation. Throughout the year, there are 105.4 rainfall days, and 10.43" (265mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Niwot, in December, snow falls for 6.1 days, with typically accumulated 3.03" (77mm) of snow. In Niwot, during the entire year, snow falls for 37.1 days and aggregates up to 26.73" (679mm) 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 December, sunrise is at 7:04 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 4:45 pm MST.
Sunshine
In December, the average sunshine is 6.9h.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 reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for the average person.Note: A maximum high UV index of 2 in December translates into the following recommendations:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Stay sun-safe with clothing that is both closely woven and worn loosely. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Niwot, CO
- Average high temperature in December: 39°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is December (39°F).
- Average low temperature in December: 19.9°F
The month with the highest average low temperature is July (59.2°F).
The coldest month (with the lowest average low temperature) is December (19.9°F).
Average pressure in December
Niwot, CO
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The months with the lowest atmospheric pressure are April and June (29.91"Hg).
Average wind speed in December
Niwot, CO
- Average wind speed in December: 5.7mph
The windiest months (with the highest average wind speed) are March and April (6.6mph).
The calmest months (with the lowest average wind speed) are August and September (5.6mph).
Average humidity in December
Niwot, CO
- Average humidity in December: 63%
The month with the highest relative humidity is February (66%).
The month with the lowest relative humidity is August (42%).
Average rainfall in December
Niwot, CO
- Average rainfall in December: 0.39"
The wettest month (with the highest rainfall) is May (1.69").
The driest month (with the least rainfall) is January (0.35").
Average rainfall days in December
Niwot, CO
- Average rainfall days in December: 4.7 days
The month with the highest number of rainy days is July (16 days).
The month with the least rainy days is January (3.5 days).
Average snowfall in December
Niwot, CO
- Average snowfall in December: 3.03"
The month with the highest snowfall is November (4.41").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Niwot, CO
- Average snowfall days in December: 6.1 days
The month with the highest number of snowfall days is February (7.7 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Niwot, CO
- Average daylight in December: 9h and 24min
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 54min
The month with the most sunshine is June (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 6h and 48min).
Average sunshine days in December
Niwot, CO
- Average sunshine days in December: 22.5 days
The month with the most sunshine days is January (23.4 days).
The month with the least sunshine days is July (9.3 days).
Average UV index in December
Niwot, CO
- Average UV index in December: 2
The months with the highest UV index are 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
Niwot, CO
- Average cloud cover in December: 23
The months with the most cloud cover are April and May (Cloud cover 26).
The months with the least cloud cover are June and September (Cloud cover 16).
Average visibility in December
Niwot, 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).
