December weather forecastMerna, WY
December
Weather in December
The first month of the winter, December, is still a freezing cold month in Merna, Wyoming, with temperature in the range of an average high of 23.7°F (-4.6°C) and an average low of 5°F (-15°C).Temperature
In Merna, the lowest temperatures are generally noted in December, averaging a high of 23.7°F (-4.6°C) and a low of 5°F (-15°C).Humidity
In Merna, the average relative humidity in December is 84%.Rainfall
In Merna, in December, during 10.5 rainfall days, 0.71" (18mm) of precipitation is typically accumulated. In Merna, Wyoming, during the entire year, the rain falls for 109.9 days and collects up to 10.59" (269mm) of precipitation.Snowfall
January through June, September through December are months with snowfall. In December, in Merna, it is snowing for 14.5 days. Throughout December, 5.55" (141mm) of snow is accumulated. In Merna, Wyoming, during the entire year, snow falls for 89 days and aggregates up to 43.43" (1103mm) of snow.Daylight
The month with the shortest days in Merna is December, with an average of 9h and 6min of daylight.On the first day of the month, sunrise is at 7:33 am and sunset at 4:47 pm. On the last day of December, in Merna, sunrise is at 7:52 am and sunset at 4:57 pm MST.
Sunshine
In Merna, the average sunshine in December is 6.4h.UV index
The months with the lowest UV index in Merna are January through April, 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 unsafe exposure to UV radiation for the ordinary person.Note: During December, 2 as the daily maximum UV index converts into the following advice:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Merna, WY
- Average high temperature in December: 23.7°F
The warmest month (with the highest average high temperature) is July (76.8°F).
The month with the lowest average high temperature is December (23.7°F).
- Average low temperature in December: 5°F
The month with the highest average low temperature is July (52°F).
The coldest month (with the lowest average low temperature) is December (5°F).
Average pressure in December
Merna, WY
- Average pressure in December: 30.25"Hg
The month with the highest atmospheric pressure is January (30.28"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Merna, WY
- Average wind speed in December: 5.3mph
The windiest month (with the highest average wind speed) is June (7mph).
The calmest month (with the lowest average wind speed) is December (5.3mph).
Average humidity in December
Merna, WY
- Average humidity in December: 84%
The months with the highest relative humidity are January and February (87%).
The month with the lowest relative humidity is August (39%).
Average rainfall in December
Merna, WY
- Average rainfall in December: 0.71"
The wettest month (with the highest rainfall) is May (1.65").
The driest months (with the least rainfall) are July and August (0.63").
Average rainfall days in December
Merna, WY
- Average rainfall days in December: 10.5 days
The month with the highest number of rainy days is May (14.3 days).
The month with the least rainy days is November (6.9 days).
Average snowfall in December
Merna, WY
- Average snowfall in December: 5.55"
The month with the highest snowfall is April (7.36").
The months with the least snowfall are July and August (0").
Average snowfall days in December
Merna, WY
- Average snowfall days in December: 14.5 days
The months with the highest number of snowfall days are February and March (15.1 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Merna, WY
- Average daylight in December: 9h and 6min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in December: 6h and 24min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 6h and 12min).
Average sunshine days in December
Merna, WY
- Average sunshine days in December: 15.1 days
The month with the most sunshine days is October (19.6 days).
The month with the least sunshine days is May (10.9 days).
Average UV index in December
Merna, WY
- 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, March, April, October, November and December (UV index 2).
Average cloud cover in December
Merna, WY
- Average cloud cover in December: 36
The month with the most cloud cover is February (Cloud cover 41).
The month with the least cloud cover is August (Cloud cover 12).
Average visibility in December
Merna, WY
- Average visibility in December: 5mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and February (4mi).
