Phoenix, AZ climate: monthly averages and frost dates
Phoenix, AZ has mild winters and very hot summers by this site's scale, with arid annual precipitation. The figures are the 1991–2020 climate normals for NOAA station USW00023183 (PHOENIX SKY HARBOR INTL AP), 11 mi (18 km) in a straight line from the city's center point (US Census).
- Warmest month high
- 106.5°F
- July
- Coldest month mean
- 55.8°F
- December
- Precipitation
- 7.2 in
- per year
- Snowfall
- no data
- per year
- 32°F nights
- 0.6
- per year
Monthly averages in Phoenix
| Month | High °F | Low °F | Mean °F | Precip. in | Snow in | Days ≥0.01 in | Days ≥90°F | Nights ≤32°F |
|---|---|---|---|---|---|---|---|---|
| January | 67.6 | 46.0 | 56.8 | 0.87 | – | 3.8 | 0.0 | 0.4 |
| February | 70.8 | 49.0 | 59.9 | 0.87 | – | 4.1 | 0.0 | 0.1 |
| March | 78.1 | 54.5 | 66.3 | 0.83 | – | 3.1 | 2.1 | 0.0 |
| April | 85.5 | 60.8 | 73.2 | 0.22 | – | 1.5 | 10.2 | 0.0 |
| May | 94.5 | 69.5 | 82.0 | 0.13 | – | 1.0 | 23.6 | 0.0 |
| June | 104.2 | 78.6 | 91.4 | 0.02 | – | 0.5 | 29.4 | 0.0 |
| July | 106.5 | 84.5 | 95.5 | 0.91 | – | 3.9 | 30.8 | 0.0 |
| August | 105.1 | 83.6 | 94.4 | 0.93 | – | 4.6 | 30.7 | 0.0 |
| September | 100.4 | 78.1 | 89.2 | 0.57 | – | 2.5 | 28.4 | 0.0 |
| October | 89.2 | 65.6 | 77.4 | 0.56 | – | 2.2 | 16.8 | 0.0 |
| November | 76.5 | 53.7 | 65.1 | 0.57 | – | 2.2 | 1.4 | 0.0 |
| December | 66.2 | 45.3 | 55.8 | 0.74 | – | 4.0 | 0.0 | 0.1 |
| Year | 87.1 | 64.1 | 75.6 | 7.22 | – | 33.4 | 173.4 | 0.6 |
How cold is winter in Phoenix?
Winters in Phoenix are mild by this site's scale (coldest-month mean 45 to under 60°F). The coldest month is December, with a mean temperature of 55.8°F (13.2°C), a normal daily high of 66.2°F (19.0°C) and a normal daily low of 45.3°F (7.4°C).
The station averages 0.6 nights a year at or below 32°F.
How hot is summer in Phoenix?
Summers in Phoenix are very hot by this site's scale (hottest-month high 100°F or more). July has the highest normal daily high, 106.5°F (41.4°C), with nights averaging 84.5°F (29.2°C).
The high reaches 90°F or more on 173.4 days in a normal year.
The normal daily high itself is 90°F or above in May to September.
What is the wettest month in Phoenix?
Phoenix gets 7.22 in (183 mm) of precipitation in a normal year, which this site classes as arid (below 10 in a year). The wettest month is August with 0.93 in (24 mm); the driest is June with 0.02 in (1 mm).
Measurable precipitation (0.01 in or more) falls on 33.4 days a year.
Does it snow in Phoenix?
NOAA publishes no snowfall normal for station USW00023183, so this page gives no snow figures for Phoenix.
Which months are mild in Phoenix?
5 months in Phoenix meet this site's comfort thresholds (normal high 65–85°F, low 45°F or higher, fewer than 10 days with 0.10 in or more of precipitation): November to March.
April misses by one threshold only (normal high 85.5°F, above the 85°F limit).
Thresholds and their limits: methodology.
Frost dates and growing season in Phoenix
In most years no night at this station gets down to 32°F, so NOAA's median freeze-free season in Phoenix is the full year. A few years do have such nights: over 1991–2020 they average 0.6 a year.
NOAA still publishes 32°F dates from the years that do freeze, but the median spring date (January 5) and the median autumn date (January 3) cross, so they do not describe a frost season and this page does not show them as one.
The month with the highest chance of at least one 32°F night is January, at 11%.
| Threshold | Median last date (spring) | Median first date (autumn or winter) | Median season, days |
|---|---|---|---|
| 36°F | January 6 | December 24 | 351 |
| 32°F | No such night in most years, though a few years have one; no typical season to show | ||
| 28°F | No such night in a typical year (NOAA publishes no dates) | ||
| 24°F | No such night in a typical year (NOAA publishes no dates) | ||
| 20°F | No such night in a typical year (NOAA publishes no dates) | ||
| 16°F | No such night in a typical year (NOAA publishes no dates) | ||
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 11% | 1% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 6% |
Nearby and similar places
Of the places on this site, the closest to Phoenix by station distance are Tucson, AZ at 108 mi (174 km), Las Vegas, NV at 256 mi (412 km) and San Diego, CA at 304 mi (489 km).
Among places whose winter, summer and precipitation words are each within one band of Phoenix's (winter: mild, summer: very hot, precipitation: arid), the closest monthly temperature and precipitation patterns are Las Vegas, NV, Tucson, AZ and Albuquerque, NM.
Compared with Tucson, AZ, Phoenix's peak-month normal high is 5.3°F (2.9°C) higher, its coldest-month mean is 2.8°F (1.6°C) higher, and its annual precipitation is 3.39 in less.
| Place | Listed as | Station distance | Coldest mean °F | Warmest high °F | Precip. in/yr | Snow in/yr | Last frost |
|---|---|---|---|---|---|---|---|
| Phoenix, AZ | this page | – | 55.8 | 106.5 | 7.2 | – | rare freeze |
| Tucson, AZ | nearby, similar | 108 mi (174 km) | 53.0 | 101.2 | 10.6 | 0.1 | February 5 |
| Las Vegas, NV | nearby, similar | 256 mi (412 km) | 48.2 | 104.5 | 4.2 | 0.2 | January 20 |
| San Diego, CA | nearby | 304 mi (489 km) | 57.9 | 77.3 | 9.8 | – | no freeze |
| Albuquerque, NM | similar | 327 mi (527 km) | 36.9 | 91.2 | 8.8 | 7.9 | April 6 |
How nearby and similar places are chosen: methodology.
Source and station
The data for Phoenix come from NOAA station PHOENIX SKY HARBOR INTL AP, AZ US (USW00023183) at 33.4278, -112.0039, elevation 1,107 ft (337 m). It lies 11 mi (18 km) in a straight line from the center point of Phoenix city, the “internal point” in the US Census 2024 Gazetteer.
Each monthly normal used here rests on at least 27 years of data from 1991–2020 (NOAA's per-field year counts).
NOAA publishes no value for 2 of the monthly fields at this station; they are shown as “no data”.
NOAA completeness flags on the monthly fields used here:
- S: Standard: meets WMO standards for data availability for 24 or more years.
Cite the data as:
Palecki, Michael; Durre, Imke; Applequist, Scott; Arguez, Anthony; Lawrimore, Jay (2021). U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991-2020). Station USW00023183 (PHOENIX SKY HARBOR INTL AP, AZ US). NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/wck8-er13. Accessed 2026-10-09.
Palecki, Michael; Durre, Imke; Applequist, Scott; Arguez, Anthony; Lawrimore, Jay (2021). U.S. Climate Normals 2020: U.S. Annual/Seasonal Climate Normals (1991-2020). Station USW00023183 (PHOENIX SKY HARBOR INTL AP, AZ US). NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/4ek7-fk11. Accessed 2026-10-09.
Files used: monthly normals CSV, annual/seasonal normals CSV (retrieved 2026-10-09). The values on this page as JSON: /us/az/phoenix/data.json.