Mesa, Arizona climate: Normal weather by month, frost dates and records
Mesa's normal year runs from 40°F December nights to 106°F July afternoons, with 10.8 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 22.3°C, December lows of 5°C, July highs of 41°C, 273 mm of precipitation a year.
- NOAA stationEast Mesa
- Station IDUSC00022782
- Location33.42°N 111.64°W
- Elevation1,518 ft (463 m)
- From the center4 miles
- Population517,151
On October 14, the normal high in Mesa is 90°F and the normal low 60°F, and the chance of measurable rain or snow is 8%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Mesa.
- Jan 68° 41°
- Feb 70° 43°
- Mar 77° 48°
- Apr 85° 53°
- May 94° 62°
- Jun 104° 71°
- Jul 106° 79°
- Aug 105° 78°
- Sep 100° 71°
- Oct 90° 59°
- Nov 77° 48°
- Dec 66° 40°
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 Mesa each month?
July is the warmest month, with normal highs of 106°F; December the coldest, with normal lows of 40°F. The most precipitation falls in February (1.46 in), the least in June (0.05 in).
Each month has its own page with the day-by-day normals, the month's records and its recent years:
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 68°F | 41°F | 54.2°F | 1.36 | 4 | <1 | 3 | 10 h 10 min |
| February | 70°F | 43°F | 56.4°F | 1.46 | 4 | <1 | 3 | 11 h |
| March | 77°F | 48°F | 62.4°F | 1.31 | 3 | 3 | <1 | 12 h |
| April | 85°F | 53°F | 69.3°F | 0.36 | 2 | 11 | <1 | 13 h |
| May | 94°F | 62°F | 78.0°F | 0.16 | 1 | 24 | <1 | 13 h 50 min |
| June | 104°F | 71°F | 87.4°F | 0.05 | 1 | 30 | <1 | 14 h 20 min |
| July | 106°F | 79°F | 92.4°F | 1.18 | 5 | 31 | <1 | 14 h 10 min |
| August | 105°F | 78°F | 91.5°F | 1.29 | 5 | 31 | <1 | 13 h 30 min |
| September | 100°F | 71°F | 85.8°F | 1.13 | 3 | 29 | <1 | 12 h 30 min |
| October | 90°F | 59°F | 74.3°F | 0.56 | 2 | 17 | <1 | 11 h 20 min |
| November | 77°F | 48°F | 62.2°F | 0.79 | 2 | 2 | 1 | 10 h 30 min |
| December | 66°F | 40°F | 53.1°F | 1.11 | 5 | <1 | 5 | 10 h |
| Year (annual) | 87°F | 58°F | 72.2°F | 10.76 | 36 | 177 | 11 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 20°C | 5°C | 12.3°C | 35 mm |
| February | 21°C | 6°C | 13.6°C | 37 mm |
| March | 25°C | 9°C | 16.9°C | 33 mm |
| April | 30°C | 12°C | 20.7°C | 9 mm |
| May | 35°C | 16°C | 25.6°C | 4 mm |
| June | 40°C | 22°C | 30.8°C | 1 mm |
| July | 41°C | 26°C | 33.6°C | 30 mm |
| August | 40°C | 26°C | 33.1°C | 33 mm |
| September | 38°C | 22°C | 29.9°C | 29 mm |
| October | 32°C | 15°C | 23.5°C | 14 mm |
| November | 25°C | 9°C | 16.8°C | 20 mm |
| December | 19°C | 5°C | 11.7°C | 28 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00022782; 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 Mesa?
Normal highs sit between 65°F and 85°F in January, February, March, November and December. Of those, November 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 USC00022782.
When is the last frost in Mesa?
In Mesa, the last spring frost (32°F) comes after February 1 in half of years and after February 28 in one year in ten; the first autumn frost comes before December 10 in half of years and before November 22 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 11 year in 10 after February 28; 9 in 10 after January 1
- First autumn frost, half of years before
- December 101 year in 10 before November 22; 9 in 10 before January 1
NOAA puts the median frost-free season at 312 days, and the season without a hard freeze (28°F) at 352 days.
A hard freeze (28°F) comes after January 11 in half of springs and before December 26 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Mesa in zones 9b to 10a across its 13 ZIP code areas (9b in 85212, the largest). By the map's own method, the average of each year's coldest night over 1991-2020, Mesa's NOAA station is in zone 9b: the coldest night of a typical year reaches 26°F (17 complete years).
Frost dates for every NOAA station in Arizona · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00022782; 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.
What hardiness zone is each Mesa ZIP code in?
The USDA's 2023 map gives each ZIP code area one zone. Mesa's 13 ZIP code areas run from zone 9b to 10a: 2 in 10a and 11 in 9b. Each ZIP's frost dates are in the frost tool.
Source: USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; ZIP areas in the place: Census Bureau 2020 ZCTA-to-place relationship file. A ZIP area counts when at least a tenth of its land (and 0.5 km²) lies in the place.
How hot and how cold does it get in Mesa?
In a normal year in Mesa, 177 days a year reach 90°F (112 of them 100°F or more), 11 nights fall to 32°F or colder and 36 days bring measurable precipitation.
- Days at 90°F or more
- 177a normal year
- Days at 100°F or more
- 112a normal year
- Nights at 32°F or colder
- 11a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 36a normal year
The highest temperature in this station's record (since 2002) is 121°F, on July 2, 2011; the lowest is 20°F, on January 15, 2007.
The wettest calendar year on that record is 2021, with 16.43 in.
Source: NOAA NCEI 1991-2020 annual normals, station USC00022782; records: ACIS (NOAA Regional Climate Centers), station USC00022782. Records use complete months only; a month missing more than three days is left out.
How sunny is Mesa?
Over a year 91% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Mesa, 5.8 kWh per square metre a day. June is the sunniest month (97%) and December the cloudiest (84%). Among the 459 U.S. places of 50,000 or more, that ranks tied 11th (with 9 others) in sunshine.
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 85% | 3.4 |
| February | 84% | 4.3 |
| March | 89% | 5.8 |
| April | 93% | 7.3 |
| May | 95% | 8.2 |
| June | 97% | 8.5 |
| July | 91% | 7.4 |
| August | 91% | 6.8 |
| September | 93% | 6.1 |
| October | 93% | 5.0 |
| November | 89% | 3.8 |
| December | 84% | 3.0 |
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 Mesa need?
A normal year in Mesa brings 1,253 heating degree days, 77% fewer than the median U.S. place (5,373), and 3,931 cooling degree days, 4.3 times the median (908). Two months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 8,239 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 335 | 2 |
| February | 246 | 6 |
| March | 126 | 45 |
| April | 29 | 156 |
| May | 2 | 405 |
| June | 0 | 672 |
| July | 0 | 849 |
| August | 0 | 821 |
| September | 0 | 624 |
| October | 10 | 298 |
| November | 135 | 51 |
| December | 369 | 1 |
| Year (annual) | 1,253 | 3,931 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00022782. 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 Mesa been warmer than normal lately?
2025 averaged 74.5°F, 2.3°F above the 1991-2020 normal of 72.2°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 73.2°F | +1.0°F | 16.43 |
| 2022 | 72.9°F | +0.7°F | 9.83 |
| 2023 | 72.7°F | +0.5°F | 10.42 |
| 2024 | 74.3°F | +2.1°F | 7.81 |
| 2025 | 74.5°F | +2.3°F | 12.53 |
Source: observed years: ACIS, station USC00022782. A year counts only with all twelve months complete.
How does Mesa's climate compare?
Mesa is warmer than 79 of the other 96 places with their own NOAA record in Arizona, and wetter than 42. Across the 7,247 U.S. stations with normals, its annual mean of 72.2°F is warmer than 97%.
In the Köppen classification computed from these normals, Mesa is BWh: hot desert. 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 Mesa's climate
What is the coldest month in Mesa?
December, with a normal high of 66°F and a normal low of 40°F. The warmest is July (106°F by day, 79°F at night).
What is the rainiest month in Mesa?
February, with 1.46 in of precipitation in a normal year; the driest is June with 0.05 in.
What plant hardiness zone is Mesa in?
The USDA's 2023 map puts Mesa in zones 9b to 10a across its 13 ZIP code areas (9b in 85212, the largest). By the same method at Mesa's NOAA station, the coldest night of a typical year reaches 26°F (17 years, 1991-2020): zone 9b.
How late can frost come in Mesa?
In half of years the last 32°F night comes after February 1; in one year in ten it comes after February 28. Waiting until February 28 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Mesa in OctoberThis month day by day, its records and recent years
- Arizona climateThe statewide normals and every place in the state
- Apache Junction, AZ10 miles from this station, 71.9°F a year
- Stewart Mountain Dam, AZ11 miles from this station, 71.1°F a year
- Fountain Hills, AZ13 miles from this station, 72.1°F a year
- Chandler, AZ15 miles from this station, 71.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made