Coolidge, Arizona climate: Normal weather by month, frost dates and records
Coolidge's normal year runs from 36°F December nights to 107°F July afternoons, with 8.3 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 21.8°C, December lows of 2°C, July highs of 41°C, 210 mm of precipitation a year.
- NOAA stationCasa Grande National Monument
- Station IDUSC00021314
- Location32.99°N 111.54°W
- Elevation1,419 ft (433 m)
- Population19,674
On October 14, the normal high in Coolidge is 91°F and the normal low 57°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 Coolidge.
- Jan 68° 37°
- Feb 71° 40°
- Mar 78° 45°
- Apr 86° 51°
- May 95° 59°
- Jun 105° 68°
- Jul 107° 77°
- Aug 105° 77°
- Sep 101° 70°
- Oct 91° 56°
- Nov 78° 44°
- Dec 67° 36°
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 Coolidge each month?
July is the warmest month, with normal highs of 107°F; December the coldest, with normal lows of 36°F. The most precipitation falls in August (1.24 in), the least in June (0.06 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 68°F | 37°F | 52.3°F | 0.98 | 4 | <1 | 10 | 10 h 10 min |
| February | 71°F | 40°F | 55.5°F | 1.02 | 4 | <1 | 5 | 11 h |
| March | 78°F | 45°F | 61.7°F | 0.94 | 3 | 3 | 1 | 12 h |
| April | 86°F | 51°F | 68.6°F | 0.25 | 1 | 12 | <1 | 13 h |
| May | 95°F | 59°F | 77.2°F | 0.20 | 1 | 25 | <1 | 13 h 50 min |
| June | 105°F | 68°F | 86.6°F | 0.06 | 1 | 30 | <1 | 14 h 20 min |
| July | 107°F | 77°F | 91.8°F | 1.12 | 5 | 31 | <1 | 14 h 10 min |
| August | 105°F | 77°F | 90.8°F | 1.24 | 5 | 30 | <1 | 13 h 20 min |
| September | 101°F | 70°F | 85.2°F | 0.70 | 3 | 29 | <1 | 12 h 30 min |
| October | 91°F | 56°F | 73.4°F | 0.48 | 2 | 18 | <1 | 11 h 30 min |
| November | 78°F | 44°F | 60.8°F | 0.49 | 2 | 2 | 2 | 10 h 30 min |
| December | 67°F | 36°F | 51.6°F | 0.77 | 4 | <1 | 11 | 10 h |
| Year (annual) | 88°F | 55°F | 71.3°F | 8.25 | 37 | 180 | 29 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 20°C | 3°C | 11.3°C | 25 mm |
| February | 22°C | 4°C | 13.1°C | 26 mm |
| March | 26°C | 7°C | 16.5°C | 24 mm |
| April | 30°C | 10°C | 20.3°C | 6 mm |
| May | 35°C | 15°C | 25.1°C | 5 mm |
| June | 41°C | 20°C | 30.3°C | 2 mm |
| July | 41°C | 25°C | 33.2°C | 28 mm |
| August | 41°C | 25°C | 32.7°C | 31 mm |
| September | 38°C | 21°C | 29.6°C | 18 mm |
| October | 33°C | 13°C | 23.0°C | 12 mm |
| November | 25°C | 7°C | 16.0°C | 12 mm |
| December | 19°C | 2°C | 10.9°C | 20 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00021314; 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 Coolidge?
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 USC00021314.
When is the last frost in Coolidge?
In Coolidge, the last spring frost (32°F) comes after February 17 in half of years and after March 8 in one year in ten; the first autumn frost comes before November 29 in half of years and before November 12 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 171 year in 10 after March 8; 9 in 10 after January 22
- First autumn frost, half of years before
- November 291 year in 10 before November 12; 9 in 10 before December 15
NOAA puts the median frost-free season at 284 days, and the season without a hard freeze (28°F) at 322 days.
A hard freeze (28°F) comes after January 26 in half of springs and before December 12 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Coolidge in zone 9a across its 2 ZIP code areas (9a in 85128, the largest).
Frost dates for every NOAA station in Arizona · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00021314; 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.
What hardiness zone is each Coolidge ZIP code in?
The USDA's 2023 map gives each ZIP code area one zone. Coolidge's 2 ZIP code areas are all in zone 9a. 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 Coolidge?
In a normal year in Coolidge, 180 days a year reach 90°F (116 of them 100°F or more), 29 nights fall to 32°F or colder and 37 days bring measurable precipitation.
- Days at 90°F or more
- 180a normal year
- Days at 100°F or more
- 116a normal year
- Nights at 32°F or colder
- 29a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 37a normal year
The highest temperature in this station's record (since 1908) is 123°F, on June 30, 1994; the lowest is 8°F, on January 7, 1913.
The wettest calendar year on that record is 1941, with 19.22 in.
Source: NOAA NCEI 1991-2020 annual normals, station USC00021314; records: ACIS (NOAA Regional Climate Centers), station USC00021314. Records use complete months only; a month missing more than three days is left out.
How sunny is Coolidge?
Over a year 92% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Coolidge, 5.9 kWh per square metre a day. June is the sunniest month (96%) and December the cloudiest (86%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 87% | 3.6 |
| February | 87% | 4.6 |
| March | 91% | 6.0 |
| April | 94% | 7.4 |
| May | 95% | 8.2 |
| June | 96% | 8.4 |
| July | 88% | 7.2 |
| August | 90% | 6.7 |
| September | 92% | 6.1 |
| October | 94% | 5.1 |
| November | 91% | 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 Coolidge need?
A normal year in Coolidge brings 1,452 heating degree days, 73% fewer than the median U.S. place (5,373), and 3,778 cooling degree days, 4.2 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 7,927 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 394 | 1 |
| February | 269 | 3 |
| March | 143 | 41 |
| April | 41 | 149 |
| May | 4 | 382 |
| June | 0 | 647 |
| July | 0 | 832 |
| August | 0 | 798 |
| September | 0 | 607 |
| October | 18 | 278 |
| November | 167 | 40 |
| December | 416 | 0 |
| Year (annual) | 1,452 | 3,778 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00021314. 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 Coolidge been warmer than normal lately?
2024 averaged 71.4°F, 0.1°F above the 1991-2020 normal of 71.3°F.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2024 | 71.4°F | +0.1°F | 8.43 |
Over 44 complete years from 1949 to 2024, the station's annual mean temperature rose at a fitted 4.4°F per century (+0.24°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00021314; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Coolidge's climate compare?
Coolidge is warmer than 71 of the other 96 places with their own NOAA record in Arizona, and wetter than 27. Across the 7,247 U.S. stations with normals, its annual mean of 71.3°F is warmer than 96%.
In the Köppen classification computed from these normals, Coolidge 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.
Which places near Coolidge share this climate record?
2 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Blackwater, AZ2,245 people · 4 mi NW
- Sacaton Flats Village, AZ450 people · 8 mi NW
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Coolidge's climate
What is the coldest month in Coolidge?
December, with a normal high of 67°F and a normal low of 36°F. The warmest is July (107°F by day, 77°F at night).
Does it snow in Coolidge?
Rarely: NOAA's normal is no measurable snow a year.
What is the rainiest month in Coolidge?
August, with 1.24 in of precipitation in a normal year; the driest is June with 0.06 in.
What plant hardiness zone is Coolidge in?
The USDA's 2023 map puts Coolidge in zone 9a across its 2 ZIP code areas (9a in 85128, the largest).
How late can frost come in Coolidge?
In half of years the last 32°F night comes after February 17; in one year in ten it comes after March 8. Waiting until March 8 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Arizona climateThe statewide normals and every place in the state
- Florence, AZ9 miles from this station, 72.4°F a year
- Casa Grande, AZ12 miles from this station, 72.4°F a year
- Robson Ranch, AZ14 miles from this station, 71.3°F a year
- Eloy, AZ15 miles from this station, 70.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made