January weather forecast
Rock River, WY

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Weather in January

January, like December, is a freezing cold winter month in Rock River, Wyoming, with temperature in the range of an average low of 14.5°F (-9.7°C) and an average high of 29.1°F (-1.6°C).

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.
Updated: Feb 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is January in Rock River?

An average high-temperature, in January, in Rock River, is 29.1°F (-1.6°C) and the average low-temperature is 14.5°F (-9.7°C).

What is the most humid month in Rock River?

January and February, with an average relative humidity of 75%, are most humid months in Rock River.

What is the average humidity in January in Rock River?

In Rock River, the average relative humidity in January is 75%.

What is the driest month in Rock River?

January is the month with the least rainfall in Rock River. Rain falls for 2.9 days and accumulates 0.35" (9mm) of precipitation.

How much does it rain in Rock River in January?

In Rock River, during January, the rain falls for 2.9 days and regularly aggregates up to 0.35" (9mm) of precipitation.

How much does it snow in Rock River in January?

In Rock River, in January, snow falls for 9.1 days, with typically accumulated 2.09" (53mm) of snow.

How many hours of daylight does Rock River have in January?

The average day length in January in Rock River is 9h and 34min.

What time are sunrise and sunset in January in Rock River?

In January, on the first day of the month, 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.

How long on average sun shines in January in Rock River?

The average sunshine duration in January in Rock River, Wyoming, is 6.8h.

What are the months with the lowest UV index in Rock River?

The months with the lowest UV index in Rock River are January through April, October through December, with an average maximum UV index of 2.

What is the UV index intensity in January in Rock River?

In January, the average daily maximum UV index in Rock River is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Rock River, WY

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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 / 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 - 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 - 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 - 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 - 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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