Riverside, WY climate
Riverside has cold winters and pleasant summers, with very little rain. A typical July afternoon reaches 81°, a January night drops to 10°.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Riverside feels like
Winter
Spring
Summer
Fall
Riverside weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 34° | 10° | 0.8" | 17° – 28° |
| February | 36° | 12° | 0.9" | 19° – 29° |
| March | 45° | 20° | 1.1" | 27° – 39° |
| April | 53° | 26° | 1.6" | 34° – 44° |
| May | 63° | 34° | 1.8" | 44° – 53° |
| June | 74° | 41° | 1.0" | 52° – 62° |
| July | 81° | 47° | 0.9" | 59° – 68° |
| August | 79° | 46° | 1.0" | 59° – 67° |
| September | 71° | 38° | 1.2" | 49° – 59° |
| October | 57° | 28° | 1.2" | 36° – 48° |
| November | 43° | 18° | 1.0" | 20° – 38° |
| December | 34° | 10° | 0.9" | 17° – 26° |
| Year | 56° | 27° | 13.3" |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Riverside
Riverside gets 13 inches of rain and melted snow a year. May is the wettest month and January the driest.
About 101 frost-free days a year
In half of years the last 32° night comes by June 2 and the first one by September 12. That leaves about 101 frost-free days for gardens, shorter than 99% of U.S. towns.
Heating and cooling a home in Riverside
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Riverside, 98% of that work is heating and 2% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
How Riverside compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Riverside averaged 1.6° warmer than the 1900s. The biggest change is in March (+3.9°). The shift is larger than in 77% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Riverside’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. November swings the most: between 1991 and 2020 its average temperature ranged from 20° to 38°. August is the most reliable, staying within 8°.
Common questions about Riverside’s climate
What is the coldest month in Riverside?
January, with a typical high of 34° and a low of 10°.
What is the hottest month in Riverside?
July, with a typical high of 81° and a low of 47°. About 5 days a year reach 90°.
When is the first frost in Riverside?
In half of years the first 32° night comes by September 12, and the last spring frost by June 2.
What is the rainiest month in Riverside?
May, with 1.8 inches of rain and melted snow. The year totals 13 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Riverside itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Saratoga, WY (16 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.