April weather forecastRock River, WY
April
Weather in April
April is a chilly spring month in Rock River, Wyoming, with an average temperature varying between 46°F (7.8°C) and 28.8°F (-1.8°C).Temperature
Rock River's transition into April brings a slight rise in the average high-temperature, moving from an icy 40.1°F (4.5°C) in March to a frosty 46°F (7.8°C). An average temperature of 28.8°F (-1.8°C) marks the nights in April.Humidity
In Rock River, the average relative humidity in April is 64%.Rainfall
In April, in Rock River, the rain falls for 9.4 days. Throughout April, 1.93" (49mm) of precipitation is accumulated. Throughout the year, there are 101.4 rainfall days, and 14.37" (365mm) of precipitation is accumulated.Snowfall
January through June, September through December are months with snowfall. April is the month with the most snowfall. Snow falls for 12.5 days and accumulates 9.76" (248mm) of snow.Daylight
The average length of the day in April is 13h and 22min.On the first day of the month, sunrise is at 6:45 am and sunset at 7:29 pm. On the last day of April, sunrise is at 6:00 am and sunset at 8:01 pm MDT.
Sunshine
In Rock River, the average sunshine in April is 10h.UV index
The months with the lowest UV index in Rock River, Wyoming, are January through April, October through December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: In April, the maximum UV index of 2 transforms into these recommendations:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in April
Rock River, WY
- Average high temperature in April: 46°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 April: 28.8°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 April
Rock River, WY
- Average pressure in April: 29.91"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 April
Rock River, WY
- Average wind speed in April: 13.2mph
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 April
Rock River, WY
- Average humidity in April: 64%
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 April
Rock River, WY
- Average rainfall in April: 1.93"
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 April
Rock River, WY
- Average rainfall days in April: 9.4 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 April
Rock River, WY
- Average snowfall in April: 9.76"
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 April
Rock River, WY
- Average snowfall days in April: 12.5 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 April /
Average sunshine in April
Rock River, WY
- Average daylight in April: 13h and 24min
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 April: 10h and 0min
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 April
Rock River, WY
- Average sunshine days in April: 9.8 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 April
Rock River, WY
- Average UV index in April: 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 April
Rock River, WY
- Average cloud cover in April: 33
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 April
Rock River, WY
- Average visibility in April: 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).
