Sun Valley weather by month
What a typical year looks like in Sun Valley, Arizona: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Petrified Forest Np, 24 km from Sun Valley; records cover 1931–2026.
The year at a glance
- Precipitation a year
- 9.6 in244 mm
- Snow a year
- 4 in9 cm
- Last spring freeze
- May 4
- First fall freeze
- Oct 19
- Heating degree days
- 4,473
- Cooling degree days
- 1,075
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 7°−14° (heating, 99%) and 100°38° (cooling, 1%).
Month by month
Sun Valley in January
Highs average 50°10° and lows 21°−6°, with 0.59 in15 mm of precipitation and 0.8 in2 cm of snow in a typical January.
- Record high
- 74°23° (2000)
- Record low
- −27°−33° (1971)
- Heating degree days
- 913
- Cooling degree days
- 0
Sun Valley in February
Highs average 56°14° and lows 24°−4°, with 0.64 in16 mm of precipitation and 0.6 in1.5 cm of snow in a typical February.
- Record high
- 77°25° (1947)
- Record low
- −8°−22° (2023)
- Heating degree days
- 690
- Cooling degree days
- 0
Sun Valley in March
Highs average 65°18° and lows 30°−1°, with 0.65 in17 mm of precipitation and 0.8 in2 cm of snow in a typical March.
- Record high
- 92°33° (2026)
- Record low
- 2°−17° (2006)
- Heating degree days
- 555
- Cooling degree days
- 0
Sun Valley in April
Highs average 72°22° and lows 36°2°, with 0.4 in10 mm of precipitation in a typical April.
- Record high
- 92°33° (1971)
- Record low
- 12°−11° (1979)
- Heating degree days
- 338
- Cooling degree days
- 2
Sun Valley in May
Highs average 81°27° and lows 44°6°, with 0.43 in11 mm of precipitation in a typical May.
- Record high
- 99°37° (2000)
- Record low
- 19°−7° (2011)
- Heating degree days
- 130
- Cooling degree days
- 42
Sun Valley in June
Highs average 91°33° and lows 53°12°, with 0.24 in6.1 mm of precipitation in a typical June.
- Record high
- 107°42° (1998)
- Record low
- 31°−1° (1993)
- Heating degree days
- 10
- Cooling degree days
- 222
Sun Valley in July
Highs average 93°34° and lows 60°16°, with 1.7 in44 mm of precipitation in a typical July.
- Record high
- 105°41° (1995)
- Record low
- 42°6° (1978)
- Heating degree days
- 0
- Cooling degree days
- 363
Sun Valley in August
Highs average 91°33° and lows 59°15°, with 1.6 in40 mm of precipitation in a typical August.
- Record high
- 103°39° (1945)
- Record low
- 41°5° (2002)
- Heating degree days
- 1
- Cooling degree days
- 308
Sun Valley in September
Highs average 85°29° and lows 52°11°, with 1 in26 mm of precipitation in a typical September.
- Record high
- 99°37° (1950)
- Record low
- 29°−2° (2013)
- Heating degree days
- 29
- Cooling degree days
- 131
Sun Valley in OctoberThis month
Highs average 74°23° and lows 39°4°, with 0.89 in23 mm of precipitation and 0.2 in0.5 cm of snow in a typical October.
- Record high
- 92°33° (2003)
- Record low
- 8°−13° (2019)
- Heating degree days
- 267
- Cooling degree days
- 7
Sun Valley in November
Highs average 61°16° and lows 28°−2°, with 0.67 in17 mm of precipitation and 0.3 in0.8 cm of snow in a typical November.
- Record high
- 83°28° (2009)
- Record low
- −13°−25° (1931)
- Heating degree days
- 615
- Cooling degree days
- 0
Sun Valley in December
Highs average 50°10° and lows 21°−6°, with 0.78 in20 mm of precipitation and 0.8 in2 cm of snow in a typical December.
- Record high
- 72°22° (1958)
- Record low
- −18°−28° (1990)
- Heating degree days
- 925
- Cooling degree days
- 0