San Manuel, Arizona climate: Normal weather by month, frost dates and records
San Manuel's normal year runs from 38°F December nights to 97°F July afternoons, with 12.6 inches of precipitation and less than an inch of snow (0.7 in) a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 19.3°C, December lows of 3°C, July highs of 36°C, 320 mm of precipitation a year.
- NOAA stationSan Manuel
- Station IDUSC00027530
- Location32.60°N 110.63°W
- Elevation3,420 ft (1,042 m)
- Population (census place)3,269
On October 23, the normal high in San Manuel is 78°F and the normal low 55°F, and the chance of measurable rain or snow is 10%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for San Manuel.
- Jan 60° 38°
- Feb 64° 41°
- Mar 71° 46°
- Apr 79° 51°
- May 88° 59°
- Jun 97° 69°
- Jul 97° 72°
- Aug 94° 71°
- Sep 90° 66°
- Oct 80° 57°
- Nov 69° 45°
- Dec 59° 38°
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 Manuel each month?
July is the warmest month, with normal highs of 97°F; December the coldest, with normal lows of 38°F. The most precipitation falls in August (2.78 in), the least in May (0.31 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 60°F | 38°F | 49.0°F | 1.12 | 5 | <1 | 5 | 10 h 10 min |
| February | 64°F | 41°F | 52.4°F | 1.14 | 5 | <1 | 3 | 11 h |
| March | 71°F | 46°F | 58.5°F | 0.65 | 4 | <1 | <1 | 12 h |
| April | 79°F | 51°F | 64.9°F | 0.36 | 2 | 2 | <1 | 13 h |
| May | 88°F | 59°F | 73.5°F | 0.31 | 2 | 13 | <1 | 13 h 50 min |
| June | 97°F | 69°F | 83.4°F | 0.34 | 2 | 29 | <1 | 14 h 20 min |
| July | 97°F | 72°F | 84.4°F | 2.38 | 9 | 28 | <1 | 14 h 10 min |
| August | 94°F | 71°F | 82.5°F | 2.78 | 10 | 27 | <1 | 13 h 20 min |
| September | 90°F | 66°F | 77.9°F | 1.29 | 5 | 15 | <1 | 12 h 30 min |
| October | 80°F | 57°F | 68.5°F | 0.59 | 3 | 2 | <1 | 11 h 30 min |
| November | 69°F | 45°F | 57.0°F | 0.62 | 3 | <1 | <1 | 10 h 30 min |
| December | 59°F | 38°F | 48.7°F | 1.03 | 5 | <1 | 5 | 10 h |
| Year (annual) | 79°F | 54°F | 66.7°F | 12.61 | 54 | 116 | 14 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 16°C | 3°C | 9.4°C | 28 mm |
| February | 18°C | 5°C | 11.3°C | 29 mm |
| March | 22°C | 8°C | 14.7°C | 17 mm |
| April | 26°C | 11°C | 18.3°C | 9 mm |
| May | 31°C | 15°C | 23.1°C | 8 mm |
| June | 36°C | 21°C | 28.6°C | 9 mm |
| July | 36°C | 22°C | 29.1°C | 60 mm |
| August | 35°C | 22°C | 28.1°C | 71 mm |
| September | 32°C | 19°C | 25.5°C | 33 mm |
| October | 27°C | 14°C | 20.3°C | 15 mm |
| November | 20°C | 7°C | 13.9°C | 16 mm |
| December | 15°C | 3°C | 9.3°C | 26 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00027530; 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 Manuel?
Normal highs sit between 65°F and 85°F in March, April, October and November. Of those, April has the fewest days with rain (2).
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 USC00027530.
When is the last frost in San Manuel?
In San Manuel, the last spring frost (32°F) comes after February 4 in half of years and after March 2 in one year in ten; the first autumn frost comes before December 8 in half of years and before November 20 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
- February 41 year in 10 after March 2; 9 in 10 after January 5
- First autumn frost, half of years before
- December 81 year in 10 before November 20; 9 in 10 before December 28
NOAA puts the median frost-free season at 306 days, and the season without a hard freeze (28°F) at 346 days.
A hard freeze (28°F) comes after January 10 in half of springs and before December 22 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts San Manuel in zone 9a in ZIP code 85631.
Frost dates for every NOAA station in Arizona · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00027530; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. 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 Manuel?
In a normal year in San Manuel, 116 days a year reach 90°F (32 of them 100°F or more), 14 nights fall to 32°F or colder and 54 days bring measurable precipitation.
- Days at 90°F or more
- 116a normal year
- Days at 100°F or more
- 32a normal year
- Nights at 32°F or colder
- 14a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 54a normal year
The highest temperature in this station's record (since 1954) is 111°F, on June 25, 1970; the lowest is 12°F, on January 11, 1962.
The wettest calendar year on that record is 2022, with 18.58 in; the snowiest season is 1975–76, with 18.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00027530; records: ACIS (NOAA Regional Climate Centers), station USC00027530. Records use complete months only; a month missing more than three days is left out.
How sunny is San Manuel?
Over a year 89% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around San Manuel, 5.8 kWh per square metre a day. June is the sunniest month (94%) and July the cloudiest (84%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 86% | 3.6 |
| February | 85% | 4.5 |
| March | 89% | 6.0 |
| April | 93% | 7.4 |
| May | 94% | 8.2 |
| June | 94% | 8.3 |
| July | 84% | 6.9 |
| August | 86% | 6.5 |
| September | 88% | 5.9 |
| October | 92% | 5.1 |
| November | 89% | 3.9 |
| December | 85% | 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 Manuel need?
A normal year in San Manuel brings 1,942 heating degree days, 64% fewer than the median U.S. place (5,373), and 2,588 cooling degree days, 2.9 times the median (908). Three months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 6,380 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 496 | 0 |
| February | 354 | 0 |
| March | 212 | 9 |
| April | 72 | 69 |
| May | 12 | 274 |
| June | 0 | 550 |
| July | 0 | 600 |
| August | 0 | 541 |
| September | 0 | 386 |
| October | 39 | 147 |
| November | 253 | 13 |
| December | 505 | 0 |
| Year (annual) | 1,942 | 2,588 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00027530. 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.
Has San Manuel been warmer than normal lately?
2024 averaged 68.3°F, 1.6°F above the 1991-2020 normal of 66.7°F. 3 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 67.9°F | +1.2°F | 15.26 |
| 2022 | 66.7°F | at normal | 18.58 |
| 2023 | 67.9°F | +1.2°F | 8.70 |
| 2024 | 68.3°F | +1.6°F | 13.96 |
Source: observed years: ACIS, station USC00027530. A year counts only with all twelve months complete.
How does San Manuel's climate compare?
San Manuel is warmer than 55 of the other 96 places with their own NOAA record in Arizona, and wetter than 55. Across the 7,247 U.S. stations with normals, its annual mean of 66.7°F is warmer than 91%.
In the Köppen classification computed from these normals, San Manuel is BSh: hot 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 Manuel's climate
What is the coldest month in San Manuel?
December, with a normal high of 59°F and a normal low of 38°F. The warmest is July (97°F by day, 72°F at night).
Does it snow in San Manuel?
Rarely: NOAA's normal is 0.7 inch a year.
What is the rainiest month in San Manuel?
August, with 2.78 in of precipitation in a normal year; the driest is May with 0.31 in.
What plant hardiness zone is San Manuel in?
The USDA's 2023 map puts San Manuel in zone 9a in ZIP code 85631.
How late can frost come in San Manuel?
In half of years the last 32°F night comes after February 4; in one year in ten it comes after March 2. Waiting until March 2 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Arizona climateThe statewide normals and every place in the state
- Oracle, AZ6 miles from this station, 62.3°F a year
- Mount Lemmon Willow Canyon, AZ16 miles from this station, 55.9°F a year
- Catalina, AZ22 miles from this station, 65.6°F a year
- Casas Adobes, AZ27 miles from this station, 69.3°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made