San Simon reaches 100° on about 38 days a year, more than 98% of U.S. towns
January nights here settle around 28°. Precipitation is light here, less than falls on 97% of U.S. towns. March has warmed most since 1901–2000, part of a 1.4° rise. Seedlings are safe outdoors from about April 16, with the first autumn frost due around November 2.
A year in San Simon at a glance
Each month’s typical high and low, and what it brings.
What stands out about San Simon’s climate
Compared with towns across the U.S., with San Simon’s place in Arizona beside it.
What a year in San Simon feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 198 frost-free days a year
In half of years the last 32° night comes by April 16 and the first by November 2. Frost and day counts come from NOAA’s station at San Simon, AZ, 1.7 miles from the town’s center, at about the same height.
The 2023 USDA map puts San Simon’s center in zone 8a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 14°. 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 San Simon, AZ, falls mostly in January. Precipitation (rain plus melted snow) adds up to 10 inches a year; August is the wettest month and May the driest. Rain or snow falls on about 33 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in San Simon
58% of the work is heating. Months averaging under 55° run from November through March.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at San Simon, AZ.
Living with San Simon’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
198 frost-free days in zone 8a. The last frost comes by Apr 16 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 2.
Months with highs of 62–84° and lows of 40° or more: April and October.
Parks & trails →Of the yearly building losses FEMA expects in San Simon from natural hazards, river flooding is the largest share (60%); heat waves, cold waves, winter storms and ice storms together are 7%. Normals are averages; the hazards page covers the extremes.
Natural hazards →San Simon and similar climates
TownRatings has no climate map of the towns around San Simon yet.
Climates most like San Simon’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 |
|---|---|---|---|---|
| San Simon, AZ | 28° | 98° | 10" | 1.2" |
| Kermit, TX | 30° | 98° | 12" | 1.9" |
| Carlsbad, NM | 29° | 97° | 13" | 2.7" |
| Rosamond, CA | 33° | 98° | 8" | 1.2" |
| Ivins, UT | 32° | 100° | 11" | 1.2" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in San Simon averaged 1.4° warmer than the 1900s. The biggest change is in March (+2.2°).
A bigger shift than in 52% 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.
How San Simon compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with San Simon’s place among Arizona’s.
San Simon weather by month
Highs, lows and precipitation from NOAA’s grid at San Simon’s center; snow, wet days and snow on the ground from San Simon, AZ. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 61° | 28° | 0.8" | 0.5" | 3 | 0 | 40° – 48° |
| February | 66° | 31° | 0.8" | 0.2" | 3 | 0 | 44° – 54° |
| March | 73° | 36° | 0.5" | 0.0" | 3 | 0 | 50° – 60° |
| April | 81° | 42° | 0.2" | 0.0" | 1 | 0 | 56° – 66° |
| May | 90° | 50° | 0.1" | 0.0" | 0 | 0 | 64° – 74° |
| June | 99° | 60° | 0.4" | 0.0" | 1 | 0 | 74° – 83° |
| July | 98° | 67° | 2.0" | 0.0" | 5 | 0 | 79° – 85° |
| August | 95° | 65° | 2.0" | 0.0" | 6 | 0 | 78° – 84° |
| September | 91° | 59° | 1.1" | 0.0" | 3 | 0 | 71° – 78° |
| October | 82° | 47° | 0.7" | 0.0" | 2 | 0 | 61° – 69° |
| November | 70° | 35° | 0.7" | 0.2" | 2 | 0 | 46° – 60° |
| December | 60° | 28° | 0.9" | 0.3" | 3 | 0 | 40° – 48° |
| Year | 80° | 46° | 10.0" | 1.2" | 33 | 0 |
How much a month can swing
A normal is an average. November swings the most: from 1991 to 2020 its average ranged from 46° to 60°. July is the most reliable, staying within 5°.
Where San Simon’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 San Simon’s center.
- Snow: San Simon, AZ (NOAA station in town).
- Frost, freezing nights, 90° and 100° days, heating and cooling: San Simon, AZ, 1.7 miles from the town’s center, at about the same height; 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 San Simon’s climate
What is the weather like in San Simon?
A typical July afternoon reaches 98°, a January night drops to 28°, and about 1 inches of snow falls in a normal winter. Milder January nights than 69% of U.S. towns; hotter July afternoons than 98% of U.S. towns.
How cold does it get in San Simon in winter?
January nights average 28°. About 91 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 40°.
How much snow does San Simon get?
About 1.2 inches in a normal winter at San Simon, AZ, most of it in January, with snow on the ground about 0 days a year.
How hot does it get in San Simon?
July, with a typical high of 98° and a low of 67°. About 134 days a year reach 90° and 38 reach 100° (San Simon, AZ).
When is the first and last frost in San Simon?
In half of years the last spring frost (32°) comes by April 16 and the first fall frost by November 2, about 198 frost-free days, at San Simon, AZ.
What growing zone is San Simon in?
Zone 8a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 14°.
What is the best time of year to visit San Simon?
By one simple rule (highs of 62–84° and lows of 40° or more), April and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is San Simon getting warmer?
Yes: 1991–2020 averaged 1.4° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 52% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in San Simon.
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.