Photo: Eddie Maloney from North Las Vegas, USA · CC BY-SA 2.0St. George reaches 100° on about 63 days a year, more than all but 118 U.S. towns
A typical July afternoon reaches 103°, a January night drops to 33°, and about 1 inches of snow falls in a normal winter.
A year in St. George at a glance
Each month’s typical high and low, and what it brings.
What stands out about St. George’s climate
Compared with towns across the U.S., with St. George’s place in Utah beside it.
What a year in St. George feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 239 frost-free days a year
In half of years the last 32° night comes by March 14 and the first by November 10. Frost and day counts come from NOAA’s station at St George, UT, 3 miles from the city’s center point, 100 ft higher.
The 2023 USDA map puts St. George’s center in zone 8b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 18°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 1 inches of snow a winter
Snow, measured at St George, UT, is heaviest from January through February, about 1 inches a month. Precipitation (rain plus melted snow) adds up to 8 inches a year; February is the wettest month and June the driest. Rain or snow falls on about 42 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in St. George
57% of the work is heating. Months averaging under 55° run from November through February.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at St George, UT.
Living with St. George’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
239 frost-free days in zone 8b. The last frost comes by Mar 14 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Nov 10.
Months with highs of 62–84° and lows of 40° or more: March, April and October. 136 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in St. George from natural hazards, river flooding is the largest share (49%); heat waves, cold waves, winter storms and ice storms together are 3%. Normals are averages; the hazards page covers the extremes.
Natural hazards →St. George and its neighbors
Ivins has the coldest January nights next door (32°, 2° colder). Differences under a degree are within what the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like St. George’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| St. George, UT | 33° | 103° | 8" | 1.2" |
| Ridgecrest, CA | 34° | 103° | 4" | 0.5" |
| Wickenburg, AZ | 36° | 103° | 11" | 0.1" |
| Monahans, TX | 30° | 98° | 12" | 0.7" |
| Carlsbad, NM | 29° | 97° | 13" | 2.7" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
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°).
A bigger shift than in 58% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods. In a city of 109,000 people, part of the change is the city itself: pavement and buildings hold heat (the urban heat island).
How St. George compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with St. George’s place among Utah’s.
St. George weather by month
Highs, lows and precipitation from NOAA’s grid at St. George’s center; snow, wet days and snow on the ground from St George, UT. 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" | 0.0" | 3 | 0 | 57° – 68° |
| May | 87° | 57° | 0.3" | 0.0" | 3 | 0 | 64° – 77° |
| June | 98° | 66° | 0.2" | 0.0" | 1 | 0 | 76° – 86° |
| July | 103° | 73° | 0.6" | 0.0" | 3 | 0 | 84° – 91° |
| August | 101° | 72° | 0.8" | 0.0" | 3 | 0 | 82° – 91° |
| September | 93° | 63° | 0.6" | 0.0" | 2 | 0 | 74° – 81° |
| October | 80° | 51° | 0.8" | 0.0" | 3 | 0 | 61° – 72° |
| November | 66° | 39° | 0.6" | 0.0" | 3 | 0 | 46° – 58° |
| December | 55° | 32° | 0.7" | 0.0" | 5 | 0 | 39° – 47° |
| Year | 79° | 51° | 7.6" | 1.2" | 42 | 0 |
How much a month can swing
A normal is an average. May swings the most: from 1991 to 2020 its average ranged from 64° to 77°. July is the most reliable, staying within 7°.
Where St. George’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at St. George’s center.
- Snow: St George, UT.
- Frost, freezing nights, 90° and 100° days, heating and cooling: St George, UT, 3 miles from the city’s center point, 100 ft higher; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about St. George’s climate
What is the weather like in St. George?
A typical July afternoon reaches 103°, a January night drops to 33°, and about 1 inches of snow falls in a normal winter. Milder January nights than 77% of U.S. towns; hotter July afternoons than all but 94 U.S. towns.
How cold does it get in St. George in winter?
December nights average 32°. About 63 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 39°.
How much snow does St. George get?
About 1.2 inches in a normal winter at St George, UT, heaviest from January through February, about 1 inches a month, with snow on the ground about 0 days a year.
How hot does it get in St. George?
July, with a typical high of 103° and a low of 73°. About 128 days a year reach 90° and 63 reach 100° (St George, UT).
When is the first and last frost in St. George?
In half of years the last spring frost (32°) comes by March 14 and the first fall frost by November 10, about 239 frost-free days, at St George, UT.
What growing zone is St. George in?
Zone 8b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 18°.
What is the best time of year to visit St. George?
By one simple rule (highs of 62–84° and lows of 40° or more), March, April and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is St. George getting warmer?
Yes: 1991–2020 averaged 1.5° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 58% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in St. George.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.