Fountain Hills weather by month
What a typical year looks like in Fountain Hills, Arizona: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Stewart Mountain Dam, 20 km from Fountain Hills; records cover 1961–2026.
The year at a glance
- Precipitation a year
- 11.9 in301 mm
- Snow a year
- Rare
- Last spring freeze
- Feb 17
- First fall freeze
- Dec 1
- Heating degree days
- 1,318
- Cooling degree days
- 3,587
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 28°−2° (heating, 99%) and 112°44° (cooling, 1%).
Month by month
Fountain Hills in January
Highs average 69°20° and lows 39°4°, with 1.8 in45 mm of precipitation in a typical January.
- Record high
- 89°32° (2003)
- Record low
- 17°−8° (1971)
- Heating degree days
- 354
- Cooling degree days
- 0
Fountain Hills in February
Highs average 72°22° and lows 41°5°, with 1.4 in35 mm of precipitation in a typical February.
- Record high
- 90°32° (1963)
- Record low
- 23°−5° (1964)
- Heating degree days
- 248
- Cooling degree days
- 3
Fountain Hills in March
Highs average 78°26° and lows 46°8°, with 1.6 in40 mm of precipitation in a typical March.
- Record high
- 99°37° (2007)
- Record low
- 22°−6° (1971)
- Heating degree days
- 135
- Cooling degree days
- 36
Fountain Hills in April
Highs average 85°30° and lows 50°10°, with 0.49 in12 mm of precipitation in a typical April.
- Record high
- 104°40° (2012)
- Record low
- 32°0° (1970)
- Heating degree days
- 42
- Cooling degree days
- 120
Fountain Hills in May
Highs average 93°34° and lows 59°15°, with 0.25 in6.4 mm of precipitation in a typical May.
- Record high
- 109°43° (1984)
- Record low
- 36°2° (1965)
- Heating degree days
- 5
- Cooling degree days
- 355
Fountain Hills in June
Highs average 103°39° and lows 68°20°, with 0.1 in2.5 mm of precipitation in a typical June.
- Record high
- 120°49° (1990)
- Record low
- 42°6° (1999)
- Heating degree days
- 0
- Cooling degree days
- 609
Fountain Hills in July
Highs average 105°41° and lows 76°25°, with 0.97 in25 mm of precipitation in a typical July.
- Record high
- 119°48° (1995)
- Record low
- 59°15° (1992)
- Heating degree days
- 0
- Cooling degree days
- 800
Fountain Hills in August
Highs average 104°40° and lows 76°24°, with 1.4 in35 mm of precipitation in a typical August.
- Record high
- 115°46° (2005)
- Record low
- 56°13° (1968)
- Heating degree days
- 0
- Cooling degree days
- 773
Fountain Hills in September
Highs average 100°38° and lows 69°21°, with 0.74 in19 mm of precipitation in a typical September.
- Record high
- 115°46° (2026)
- Record low
- 46°8° (1965)
- Heating degree days
- 0
- Cooling degree days
- 582
Fountain Hills in OctoberThis month
Highs average 90°32° and lows 56°14°, with 0.7 in18 mm of precipitation in a typical October.
- Record high
- 107°42° (2020)
- Record low
- 30°−1° (1971)
- Heating degree days
- 16
- Cooling degree days
- 264
Fountain Hills in November
Highs average 78°26° and lows 45°7°, with 0.87 in22 mm of precipitation in a typical November.
- Record high
- 98°37° (2020)
- Record low
- 24°−4° (1987)
- Heating degree days
- 148
- Cooling degree days
- 44
Fountain Hills in December
Highs average 68°20° and lows 38°3°, with 1.6 in42 mm of precipitation in a typical December.
- Record high
- 85°29° (1980)
- Record low
- 18°−8° (1990)
- Heating degree days
- 370
- Cooling degree days
- 1