Big Horn, WY climate
Big Horn has cold, snowy winters and warm summers, with very little rain. A typical July afternoon reaches 87°, a January night drops to 12°, and about 81 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeRight about normal today. The forecast high is 67°, and a typical Oct 1 in Big Horn peaks around 67°.Live forecast: National Weather Service · Normal: NOAA 1991–2020
What a year in Big Horn feels like
Winter
Spring
Summer
Fall
Big Horn weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 36° | 12° | 0.8" | 11.4" | 7 | 21 | 16° – 33° |
| February | 38° | 14° | 0.9" | 16.1" | 9 | 20 | 15° – 36° |
| March | 49° | 23° | 1.6" | 13.6" | 8 | 10 | 25° – 45° |
| April | 57° | 30° | 2.6" | 10.2" | 11 | 5 | 37° – 48° |
| May | 66° | 39° | 3.6" | 2.0" | 15 | 1 | 48° – 58° |
| June | 77° | 48° | 2.3" | 0 | 10 | 0 | 56° – 68° |
| July | 87° | 55° | 1.3" | 0 | 7 | 0 | 62° – 76° |
| August | 86° | 52° | 0.8" | 0 | 7 | 0 | 63° – 73° |
| September | 75° | 43° | 1.7" | 1.0" | 7 | 0 | 54° – 64° |
| October | 60° | 31° | 2.3" | 6.2" | 10 | 2 | 37° – 52° |
| November | 46° | 21° | 1.1" | 9.2" | 7 | 8 | 24° – 43° |
| December | 36° | 12° | 0.9" | 11.7" | 6 | 20 | 16° – 31° |
| Year | 59° | 32° | 19.7" | 81.4" | 106 | 88 |
“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 Big Horn
Big Horn gets 20 inches of rain and melted snow a year. May is the wettest month and January the driest. Rain or snow falls on about 106 days a year. Snow covers the ground about 88 days of the year.
About 123 frost-free days a year
In half of years the last 32° night comes by May 21 and the first one by September 23. That leaves about 123 frost-free days for gardens, shorter than 97% of U.S. towns.
Heating and cooling a home in Big Horn
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Big Horn, 94% of that work is heating and 6% 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 Big Horn 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 Big Horn averaged 1.7° warmer than the 1900s. The biggest change is in January (+4.6°). The shift is larger than in 82% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Big Horn’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. February swings the most: between 1991 and 2020 its average temperature ranged from 15° to 36°. May is the most reliable, staying within 10°.
Common questions about Big Horn’s climate
What is the coldest month in Big Horn?
January, with a typical high of 36° and a low of 12°.
What is the hottest month in Big Horn?
July, with a typical high of 87° and a low of 55°. About 35 days a year reach 90°.
How much snow does Big Horn get?
About 81 inches in a normal winter, most of it in February.
When is the first frost in Big Horn?
In half of years the first 32° night comes by September 23, and the last spring frost by May 21.
What is the rainiest month in Big Horn?
May, with 3.6 inches of rain and melted snow. The year totals 20 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Big Horn itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Big Horn, WY (1 mi, snow) and Sheridan Co Airport, WY (6 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.