Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
Temperature readings reach their annual highs in December, averaging 26.4°F (-3.1°C) and a minimum average of 10.9°F (-11.7°C).Humidity
In Hilliard, the average relative humidity in December is 85%.Rainfall
In December, the rain falls for 7.1 days. Throughout December, 1.14" (29mm) of precipitation is accumulated. Throughout the year, there are 94.2 rainfall days, and 11.5" (292mm) of precipitation is accumulated.Snowfall
January through June, September through December are months with snowfall. In Hilliard, during December, snow falls for 15.5 days and regularly aggregates up to 8.74" (222mm) of snow. In Hilliard, during the entire year, snow falls for 99.3 days and aggregates up to 56.22" (1428mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 18min of daylight.On the first day of December in Hilliard, sunrise is at 7:29 am and sunset at 4:55 pm. On the last day of the month, sunrise is at 7:48 am and sunset at 5:04 pm MST.
Sunshine
In December, the average sunshine is 6h.UV index
November and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The UV index of 1 in December translates into these instructions:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest time of year?
How cold is December?
What is the average humidity in December?
How much does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Hilliard have in December?
When is the sunrise / sunset in December?
How many hours of sunshine does Hilliard have in December?
What are the months with the lowest UV index?
How high is the UV index in December?
Average temperature in December
Hilliard, WY
- Average high temperature in December: 26.4°F
The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is December (26.4°F).
- Average low temperature in December: 10.9°F
The month with the highest average low temperature is July (51.6°F).
The coldest month (with the lowest average low temperature) is January (10.8°F).
Average pressure in December
Hilliard, WY
- Average pressure in December: 30.24"Hg
The month with the highest atmospheric pressure is January (30.29"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in December
Hilliard, WY
- Average wind speed in December: 6.8mph
The windiest month (with the highest average wind speed) is April (8.2mph).
The calmest month (with the lowest average wind speed) is July (6.7mph).
Average humidity in December
Hilliard, WY
- Average humidity in December: 85%
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
Hilliard, WY
- Average rainfall in December: 1.14"
The wettest months (with the highest rainfall) are April and May (1.38").
The driest month (with the least rainfall) is August (0.51").
Average rainfall days in December
Hilliard, WY
- Average rainfall days in December: 7.1 days
The month with the highest number of rainy days is May (11.9 days).
The month with the least rainy days is February (5.5 days).
Average snowfall in December
Hilliard, WY
- Average snowfall in December: 8.74"
The month with the highest snowfall is March (10").
The months with the least snowfall are July and August (0").
Average snowfall days in December
Hilliard, WY
- Average snowfall days in December: 15.5 days
The month with the highest number of snowfall days is February (16.3 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Hilliard, WY
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 6h and 0min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 5h and 48min).
Average sunshine days in December
Hilliard, WY
- Average sunshine days in December: 15.1 days
The month with the most sunshine days is June (19.5 days).
The month with the least sunshine days is April (10.8 days).
Average UV index in December
Hilliard, WY
- Average UV index in December: 1
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are November and December (UV index 1).
Average cloud cover in December
Hilliard, WY
- Average cloud cover in December: 39
The month with the most cloud cover is February (Cloud cover 45).
The month with the least cloud cover is August (Cloud cover 10).
Average visibility in December
Hilliard, 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).
Hilliard, Wyoming, USA
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