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Fountain Hills, Arizona climate
BWh Hot desert
Fountain Hills has a seasonal warm-temperate climate (Hot desert, Köppen BWh). The hottest month is July with an average daily high near 39°C, while the coldest is December averaging around 7°C at night. Precipitation totals about 259 mm a year and is strongly seasonal — January alone averages 36 mm while June barely receives 4 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsFountain Hills climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 18 | 20 | 23 | 28 | 33 | 38 | 39 | 39 | 36 | 30 | 23 | 17 |
| Avg temp (°C) | 12 | 14 | 17 | 21 | 25 | 30 | 33 | 33 | 30 | 24 | 17 | 12 |
| Avg low (°C) | 7 | 8 | 10 | 14 | 18 | 23 | 27 | 27 | 23 | 17 | 11 | 7 |
| Precipitation (mm) | 36 | 34 | 33 | 8 | 6 | 4 | 20 | 34 | 21 | 16 | 19 | 29 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 18 | 20 | 23 | 28 | 33 | 38 |
| Avg temp (°C) | 12 | 14 | 17 | 21 | 25 | 30 |
| Avg low (°C) | 7 | 8 | 10 | 14 | 18 | 23 |
| Precipitation (mm) | 36 | 34 | 33 | 8 | 6 | 4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 39 | 39 | 36 | 30 | 23 | 17 |
| Avg temp (°C) | 33 | 33 | 30 | 24 | 17 | 12 |
| Avg low (°C) | 27 | 27 | 23 | 17 | 11 | 7 |
| Precipitation (mm) | 20 | 34 | 21 | 16 | 19 | 29 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 4 | 4 | 3 | 1 | 1 | 0.3 | 3 | 4 | 2 | 2 | 2 | 3 |
| Days with high ≥ 32°C (days) | — | — | 1 | 8 | 21 | 28 | 28 | 29 | 26 | 14 | 0.6 | — |
| Days with low ≤ 0°C (days) | 1 | 0.3 | — | — | — | — | — | — | — | — | 0.3 | 2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 4 | 4 | 3 | 1 | 1 | 0.3 |
| Days with high ≥ 32°C (days) | — | — | 1 | 8 | 21 | 28 |
| Days with low ≤ 0°C (days) | 1 | 0.3 | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 3 | 4 | 2 | 2 | 2 | 3 |
| Days with high ≥ 32°C (days) | 28 | 29 | 26 | 14 | 0.6 | — |
| Days with low ≤ 0°C (days) | — | — | — | — | 0.3 | 2 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 42 | 44 | 38 | 30 | 25 | 20 | 46 | 45 | 29 | 27 | 32 | 42 |
| Clear days (≤ 30% cloud) | 14 | 12 | 15 | 18 | 21 | 23 | 10 | 11 | 18 | 20 | 17 | 14 |
| Partly cloudy days (30–70%) | 9 | 8 | 9 | 8 | 8 | 5 | 14 | 14 | 8 | 6 | 7 | 8 |
| Cloudy days (≥ 70%) | 8 | 8 | 7 | 4 | 3 | 2 | 8 | 7 | 4 | 5 | 5 | 8 |
| Relative humidity (%) | 47 | 45 | 40 | 31 | 23 | 16 | 29 | 35 | 32 | 30 | 35 | 45 |
| Wind speed (m/s) | 1.9 | 1.9 | 2.0 | 2.2 | 2.2 | 2.2 | 2.0 | 1.8 | 1.9 | 2.0 | 2.0 | 1.9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 42 | 44 | 38 | 30 | 25 | 20 |
| Clear days (≤ 30% cloud) | 14 | 12 | 15 | 18 | 21 | 23 |
| Partly cloudy days (30–70%) | 9 | 8 | 9 | 8 | 8 | 5 |
| Cloudy days (≥ 70%) | 8 | 8 | 7 | 4 | 3 | 2 |
| Relative humidity (%) | 47 | 45 | 40 | 31 | 23 | 16 |
| Wind speed (m/s) | 1.9 | 1.9 | 2.0 | 2.2 | 2.2 | 2.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 46 | 45 | 29 | 27 | 32 | 42 |
| Clear days (≤ 30% cloud) | 10 | 11 | 18 | 20 | 17 | 14 |
| Partly cloudy days (30–70%) | 14 | 14 | 8 | 6 | 7 | 8 |
| Cloudy days (≥ 70%) | 8 | 7 | 4 | 5 | 5 | 8 |
| Relative humidity (%) | 29 | 35 | 32 | 30 | 35 | 45 |
| Wind speed (m/s) | 2.0 | 1.8 | 1.9 | 2.0 | 2.0 | 1.9 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Fountain Hills (NOAA GHCN station USC00023190), about 1 km from the city centre.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.