St. George, UT climate
St. George has mild winters and scorching summers, with very little rain. A typical July afternoon reaches 103°, a January night drops to 33°, and about 1 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in St. George feels like
Winter
Spring
Summer
Fall
St. George 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 | 56° | 33° | 0.8" | 0.5" | 5 | 0 | 40° – 51° |
| February | 61° | 37° | 1.0" | 0.5" | 6 | 0 | 42° – 55° |
| March | 69° | 43° | 0.8" | 0.2" | 5 | 0 | 50° – 63° |
| April | 77° | 48° | 0.5" | 0 | 3 | 0 | 57° – 68° |
| May | 87° | 57° | 0.3" | 0 | 3 | 0 | 64° – 77° |
| June | 98° | 66° | 0.2" | 0 | 1 | 0 | 76° – 86° |
| July | 103° | 73° | 0.6" | 0 | 3 | 0 | 84° – 91° |
| August | 101° | 72° | 0.8" | 0 | 3 | 0 | 82° – 91° |
| September | 93° | 63° | 0.6" | 0 | 2 | 0 | 74° – 81° |
| October | 80° | 51° | 0.8" | 0 | 3 | 0 | 61° – 72° |
| November | 66° | 39° | 0.6" | 0 | 3 | 0 | 46° – 58° |
| December | 55° | 32° | 0.7" | 0 | 5 | 0 | 39° – 47° |
| Year | 79° | 51° | 7.6" | 1.2" | 42 | 0 |
“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 St. George
St. George gets 8 inches of rain and melted snow a year. February is the wettest month and June the driest. Rain or snow falls on about 42 days a year.
About 239 frost-free days a year
In half of years the last 32° night comes by March 14 and the first one by November 10. That leaves about 239 frost-free days for gardens, longer than 88% of U.S. towns.
Heating and cooling a home in St. George
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In St. George, 57% of that work is heating and 43% is cooling.
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.
St. George and its neighbors
St. George borders 3 towns with climate data. January nights across them vary by 1.7°. Ivins has the coldest January nights (32°) and Santa Clara the hottest July afternoons (102°). St. George’s January low is 33° and its July high 103°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How St. George 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 St. George averaged 1.5° warmer than the 1900s. The biggest change is in January (+2.3°). The shift is larger than in 68% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at St. George’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. May swings the most: between 1991 and 2020 its average temperature ranged from 64° to 77°. July is the most reliable, staying within 7°.
Common questions about St. George’s climate
What is the coldest month in St. George?
December, with a typical high of 55° and a low of 32°.
What is the hottest month in St. George?
July, with a typical high of 103° and a low of 73°. About 128 days a year reach 90°.
How much snow does St. George get?
About 1 inches in a normal winter, most of it in January.
When is the first frost in St. George?
In half of years the first 32° night comes by November 10, and the last spring frost by March 14.
What is the rainiest month in St. George?
February, with 1.0 inches of rain and melted snow. The year totals 8 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for St. George itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at St George, UT (3 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.