San Simon, Arizona climate: Normal weather by month, frost dates and records
San Simon's normal year runs from 28°F December nights to 98°F July afternoons, with 10.3 inches of precipitation and 1 inch of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 17.2°C, December lows of −2°C, July highs of 37°C, 262 mm of precipitation a year.
- NOAA stationSan Simon
- Station IDUSC00027560
- Location32.29°N 109.23°W
- Elevation3,580 ft (1,091 m)
- Population (census place)253
On October 23, the normal high in San Simon is 80°F and the normal low 43°F, and the chance of measurable rain or snow is 7%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for San Simon.
- Jan 61° 28°
- Feb 66° 31°
- Mar 74° 36°
- Apr 81° 41°
- May 90° 49°
- Jun 99° 59°
- Jul 98° 66°
- Aug 96° 65°
- Sep 92° 59°
- Oct 83° 46°
- Nov 70° 34°
- Dec 60° 28°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in San Simon each month?
July is the warmest month, with normal highs of 98°F; December the coldest, with normal lows of 28°F. The most precipitation falls in July (2.19 in), the least in May (0.12 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 61°F | 28°F | 44.2°F | 0.92 | 0.5 | 3 | <1 | 24 | 10 h 10 min |
| February | 66°F | 31°F | 48.4°F | 0.79 | 0.2 | 3 | <1 | 17 | 11 h |
| March | 74°F | 36°F | 54.6°F | 0.48 | 0.0 | 3 | <1 | 10 | 12 h |
| April | 81°F | 41°F | 61.2°F | 0.24 | 0.0 | 1 | 4 | 4 | 13 h |
| May | 90°F | 49°F | 69.6°F | 0.12 | 0.0 | <1 | 18 | <1 | 13 h 50 min |
| June | 99°F | 59°F | 78.7°F | 0.44 | 0.0 | 1 | 28 | <1 | 14 h 20 min |
| July | 98°F | 66°F | 82.0°F | 2.19 | 0.0 | 5 | 29 | <1 | 14 h 10 min |
| August | 96°F | 65°F | 80.3°F | 1.92 | 0.0 | 6 | 28 | <1 | 13 h 20 min |
| September | 92°F | 59°F | 75.1°F | 0.90 | 0.0 | 3 | 21 | <1 | 12 h 20 min |
| October | 83°F | 46°F | 64.2°F | 0.76 | 0.0 | 2 | 6 | 1 | 11 h 30 min |
| November | 70°F | 34°F | 52.2°F | 0.55 | 0.2 | 2 | <1 | 12 | 10 h 30 min |
| December | 60°F | 28°F | 44.0°F | 1.00 | 0.3 | 3 | <1 | 23 | 10 h |
| Year (annual) | 81°F | 45°F | 62.9°F | 10.31 | 1.2 | 33 | 134 | 91 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 16°C | −2°C | 6.8°C | 23 mm | 1 cm |
| February | 19°C | −1°C | 9.1°C | 20 mm | 1 cm |
| March | 23°C | 2°C | 12.6°C | 12 mm | 0 cm |
| April | 27°C | 5°C | 16.2°C | 6 mm | 0 cm |
| May | 32°C | 9°C | 20.9°C | 3 mm | 0 cm |
| June | 37°C | 15°C | 25.9°C | 11 mm | 0 cm |
| July | 37°C | 19°C | 27.8°C | 56 mm | 0 cm |
| August | 35°C | 18°C | 26.8°C | 49 mm | 0 cm |
| September | 33°C | 15°C | 23.9°C | 23 mm | 0 cm |
| October | 28°C | 8°C | 17.9°C | 19 mm | 0 cm |
| November | 21°C | 1°C | 11.2°C | 14 mm | 1 cm |
| December | 16°C | −2°C | 6.7°C | 25 mm | 1 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00027560; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit San Simon?
Normal highs sit between 65°F and 85°F in February, March, April, October and November. Of those, April has the fewest days with rain (1).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00027560.
When is the last frost in San Simon?
In San Simon, the last spring frost (32°F) comes after April 16 in half of years and after May 4 in one year in ten; the first autumn frost comes before November 2 in half of years and before October 17 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- April 161 year in 10 after May 4; 9 in 10 after March 31
- First autumn frost, half of years before
- November 21 year in 10 before October 17; 9 in 10 before November 16
NOAA puts the median frost-free season at 198 days, and the season without a hard freeze (28°F) at 224 days.
A hard freeze (28°F) comes after April 2 in half of springs and before November 12 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts San Simon in zone 8b in ZIP code 85605, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, San Simon's NOAA station is in zone 8a: the coldest night of a typical year reaches 12°F (20 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in Arizona · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00027560; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in San Simon?
In a normal year in San Simon, 134 days a year reach 90°F (38 of them 100°F or more), 91 nights fall to 32°F or colder and 33 days bring measurable precipitation.
- Days at 90°F or more
- 134a normal year
- Days at 100°F or more
- 38a normal year
- Nights at 32°F or colder
- 91a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 33a normal year
- Days with 1 inch of snow or more
- fewer than 1a normal year
The highest temperature in this station's record (since 1903) is 114°F, on June 26, 1994; the lowest is −5°F, on January 6, 1913.
The wettest calendar year on that record is 1958, with 15.21 in; the snowiest season is 1987–88, with 10.6 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00027560; records: ACIS (NOAA Regional Climate Centers), station USC00027560. Records use complete months only; a month missing more than three days is left out.
How sunny is San Simon?
Over a year 89% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around San Simon, 5.8 kWh per square metre a day. May is the sunniest month (94%) and February the cloudiest (85%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 86% | 3.6 |
| February | 85% | 4.5 |
| March | 89% | 6.0 |
| April | 92% | 7.4 |
| May | 94% | 8.2 |
| June | 94% | 8.2 |
| July | 86% | 7.1 |
| August | 87% | 6.6 |
| September | 88% | 5.9 |
| October | 92% | 5.1 |
| November | 89% | 3.9 |
| December | 86% | 3.3 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does San Simon need?
A normal year in San Simon brings 2,730 heating degree days, 49% fewer than the median U.S. place (5,373), and 1,983 cooling degree days, 2.2 times the median (908). Five months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 5,297 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 646 | 0 |
| February | 465 | 0 |
| March | 324 | 2 |
| April | 140 | 28 |
| May | 24 | 167 |
| June | 1 | 413 |
| July | 0 | 527 |
| August | 0 | 474 |
| September | 2 | 305 |
| October | 91 | 66 |
| November | 388 | 2 |
| December | 649 | 0 |
| Year (annual) | 2,730 | 1,983 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00027560. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
How does San Simon's climate compare?
San Simon is warmer than 41 of the other 96 places with their own NOAA record in Arizona, and wetter than 39. Across the 7,247 U.S. stations with normals, its annual mean of 62.9°F is warmer than 82%.
In the Köppen classification computed from these normals, San Simon is BSk: cold semi-arid steppe. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Questions about San Simon's climate
What is the coldest month in San Simon?
December, with a normal high of 60°F and a normal low of 28°F. The warmest is July (98°F by day, 66°F at night).
Does it snow in San Simon?
Yes: 1 inch in a normal year, falling on 0 days with 0.1 inch or more, the most in January (0.5 inches).
What is the rainiest month in San Simon?
July, with 2.19 in of precipitation in a normal year; the driest is May with 0.12 in.
What plant hardiness zone is San Simon in?
The USDA's 2023 map puts San Simon in zone 8b in ZIP code 85605, the nearest ZIP area. By the same method at San Simon's NOAA station, the coldest night of a typical year reaches 12°F (20 years, 1991-2020): zone 8a.
How late can frost come in San Simon?
In half of years the last 32°F night comes after April 16; in one year in ten it comes after May 4. Waiting until May 4 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Arizona climateThe statewide normals and every place in the state
- Bowie, AZ16 miles from this station, 63.2°F a year
- Chiricahua National Monument, AZ21 miles from this station, 59.5°F a year
- Paradise, AZ25 miles from this station, 56.7°F a year
- Portal (4 mi SW), AZ29 miles from this station, 56.5°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made