December weather forecastSleepy Hollow, WY
December
Weather in December
The first month of the winter, December, is still a freezing cold month in Sleepy Hollow, Wyoming, with an average temperature varying between 29.7°F (-1.3°C) and 17.2°F (-8.2°C).Temperature
December is the month when Sleepy Hollow sees the lowest average temperatures, with a high of 29.7°F (-1.3°C) and a low of 17.2°F (-8.2°C).Humidity
In Sleepy Hollow, the average relative humidity in December is 75%.Rainfall
In Sleepy Hollow, in December, during 1.8 rainfall days, 0.43" (11mm) of precipitation is typically accumulated. Throughout the year, in Sleepy Hollow, there are 108.9 rainfall days, and 15.59" (396mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, September through December. In Sleepy Hollow, during December, snow falls for 6.2 days and regularly aggregates up to 1.81" (46mm) of snow. In Sleepy Hollow, during the entire year, snow falls for 50.5 days and aggregates up to 19.53" (496mm) of snow.Daylight
The month with the shortest days is December, with an average of 8h and 54min of daylight.On the first day of the month, sunrise is at 7:17 am and sunset at 4:24 pm. On the last day of December, sunrise is at 7:37 am and sunset at 4:33 pm MST.
Sunshine
In December, the average sunshine in Sleepy Hollow is 5.9h.UV index
The months with the lowest UV index are January, February, April, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for ordinary individuals.Note: A maximum high daily UV index of 2 during December translates into the following directions:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Sleepy Hollow, WY
- Average high temperature in December: 29.7°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is December (29.7°F).
- Average low temperature in December: 17.2°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is February (16.7°F).
Average pressure in December
Sleepy Hollow, WY
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in December
Sleepy Hollow, WY
- Average wind speed in December: 11mph
The windiest month (with the highest average wind speed) is April (11.2mph).
The calmest months (with the lowest average wind speed) are July and August (9.1mph).
Average humidity in December
Sleepy Hollow, WY
- Average humidity in December: 75%
The month with the highest relative humidity is January (78%).
The month with the lowest relative humidity is August (41%).
Average rainfall in December
Sleepy Hollow, WY
- Average rainfall in December: 0.43"
The wettest month (with the highest rainfall) is May (3.11").
The driest month (with the least rainfall) is January (0.39").
Average rainfall days in December
Sleepy Hollow, WY
- Average rainfall days in December: 1.8 days
The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is February (1.5 days).
Average snowfall in December
Sleepy Hollow, WY
- Average snowfall in December: 1.81"
The month with the highest snowfall is April (3.82").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Sleepy Hollow, WY
- Average snowfall days in December: 6.2 days
The month with the highest number of snowfall days is February (9.1 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Sleepy Hollow, WY
- Average daylight in December: 8h and 54min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in December: 5h and 54min
The months with the most sunshine are July and August (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 36min).
Average sunshine days in December
Sleepy Hollow, WY
- Average sunshine days in December: 22.4 days
The month with the most sunshine days is December (22.4 days).
The month with the least sunshine days is May (9.3 days).
Average UV index in December
Sleepy Hollow, WY
- 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, April, November and December (UV index 2).
Average cloud cover in December
Sleepy Hollow, WY
- Average cloud cover in December: 39
The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in December
Sleepy Hollow, WY
- 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).
