Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
The average high-temperature during January registers at a still freezing cold 29.1°F (-1.6°C), maintaining a close resemblance to the previous month. Rock River, during the month of January, experiences an average low-temperature of 14.5°F (-9.7°C).Humidity
The months with the highest humidity in Rock River, Wyoming, are January and February, with an average relative humidity of 75%.Rainfall
January is the month with the least rainfall in Rock River. Rain falls for 2.9 days and accumulates 0.35" (9mm) of precipitation.Snowfall
Months with snowfall in Rock River, Wyoming, are January through June, September through December. In Rock River, Wyoming, in January, snow falls for 9.1 days, with typically accumulated 2.09" (53mm) of snow. Throughout the year, in Rock River, there are 78.1 snowfall days, and 44.8" (1138mm) of snow is accumulated.Daylight
In Rock River, the average length of the day in January is 9h and 34min.On the first day of January in Rock River, sunrise is at 7:31 am and sunset at 4:43 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 5:17 pm MST.
Sunshine
In Rock River, the average sunshine in January is 6.8h.UV index
January through April, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Rock River. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: A maximum high daily UV index of 2 during January translates into the following directions:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is January in Rock River?
What is the most humid month in Rock River?
What is the average humidity in January in Rock River?
What is the driest month in Rock River?
How much does it rain in Rock River in January?
How much does it snow in Rock River in January?
How many hours of daylight does Rock River have in January?
What time are sunrise and sunset in January in Rock River?
How long on average sun shines in January in Rock River?
What are the months with the lowest UV index in Rock River?
What is the UV index intensity in January in Rock River?
Average temperature in January
Rock River, WY
- Average high temperature in January: 29.1°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 (28.2°F).
- Average low temperature in January: 14.5°F
The month with the highest average low temperature is July (54.1°F).
The coldest month (with the lowest average low temperature) is December (14.4°F).
Average pressure in January
Rock River, WY
- Average pressure in January: 30.17"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in January
Rock River, WY
- Average wind speed in January: 14.5mph
The windiest month (with the highest average wind speed) is January (14.5mph).
The calmest month (with the lowest average wind speed) is July (9.3mph).
Average humidity in January
Rock River, WY
- Average humidity in January: 75%
The months with the highest relative humidity are January and February (75%).
The months with the lowest relative humidity are August and September (43%).
Average rainfall in January
Rock River, WY
- Average rainfall in January: 0.35"
The wettest month (with the highest rainfall) is May (2.68").
The driest month (with the least rainfall) is January (0.35").
Average rainfall days in January
Rock River, WY
- Average rainfall days in January: 2.9 days
The months with the highest number of rainy days are May and July (15.1 days).
The months with the least rainy days are January, February and November (2.9 days).
Average snowfall in January
Rock River, WY
- Average snowfall in January: 2.09"
The month with the highest snowfall is April (9.76").
The months with the least snowfall are July and August (0").
Average snowfall days in January
Rock River, WY
- Average snowfall days in January: 9.1 days
The month with the highest number of snowfall days is April (12.5 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in January /
Average sunshine in January
Rock River, WY
- Average daylight in January: 9h and 4min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in January: 6h and 5min
The month with the most sunshine is July (Average sunshine: 11h and 36min).
The month with the least sunshine is December (Average sunshine: 6h and 24min).
Average sunshine days in January
Rock River, WY
- Average sunshine days in January: 21.4 days
The month with the most sunshine days is January (21.4 days).
The month with the least sunshine days is May (8.9 days).
Average UV index in January
Rock River, WY
- Average UV index in January: 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 January
Rock River, WY
- Average cloud cover in January: 28
The month with the most cloud cover is February (Cloud cover 34).
The month with the least cloud cover is September (Cloud cover 17).
Average visibility in January
Rock River, WY
- Average visibility in January: 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).
Rock River, Wyoming, USA
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