Castle Valley weather by month
What a typical year looks like in Castle Valley, Utah: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Arches Np Hqs, 20 km from Castle Valley; records cover 1980–2026.
The year at a glance
- Precipitation a year
- 8.5 in215 mm
- Snow a year
- 8 in21 cm
- Last spring freeze
- Apr 15
- First fall freeze
- Oct 27
- Heating degree days
- 4,450
- Cooling degree days
- 1,937
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 8°−13° (heating, 99%) and 107°42° (cooling, 1%).
Month by month
Castle Valley in January
Highs average 42°5° and lows 22°−5°, with 0.55 in14 mm of precipitation and 2.1 in5.3 cm of snow in a typical January.
- Record high
- 63°17° (1999)
- Record low
- −4°−20° (2013)
- Heating degree days
- 1026
- Cooling degree days
- 0
Castle Valley in February
Highs average 50°10° and lows 29°−2°, with 0.56 in14 mm of precipitation and 1.2 in3 cm of snow in a typical February.
- Record high
- 74°23° (1986)
- Record low
- −8°−22° (1989)
- Heating degree days
- 713
- Cooling degree days
- 0
Castle Valley in March
Highs average 62°17° and lows 37°3°, with 0.65 in17 mm of precipitation and 0.5 in1.3 cm of snow in a typical March.
- Record high
- 93°34° (2026)
- Record low
- 13°−11° (2002)
- Heating degree days
- 482
- Cooling degree days
- 1
Castle Valley in April
Highs average 70°21° and lows 44°7°, with 0.71 in18 mm of precipitation in a typical April.
- Record high
- 93°34° (1992)
- Record low
- 21°−6° (1982)
- Heating degree days
- 265
- Cooling degree days
- 15
Castle Valley in May
Highs average 80°27° and lows 53°12°, with 0.75 in19 mm of precipitation in a typical May.
- Record high
- 105°41° (2002)
- Record low
- 28°−2° (2007)
- Heating degree days
- 81
- Cooling degree days
- 129
Castle Valley in June
Highs average 93°34° and lows 63°17°, with 0.43 in11 mm of precipitation in a typical June.
- Record high
- 110°43° (1994)
- Record low
- 37°3° (2007)
- Heating degree days
- 6
- Cooling degree days
- 388
Castle Valley in July
Highs average 99°37° and lows 70°21°, with 0.73 in19 mm of precipitation in a typical July.
- Record high
- 116°47° (2003)
- Record low
- 50°10° (1982)
- Heating degree days
- 0
- Cooling degree days
- 604
Castle Valley in August
Highs average 96°35° and lows 68°20°, with 0.9 in23 mm of precipitation in a typical August.
- Record high
- 109°43° (1996)
- Record low
- 41°5° (2017)
- Heating degree days
- 0
- Cooling degree days
- 522
Castle Valley in September
Highs average 87°31° and lows 58°15°, with 0.88 in22 mm of precipitation in a typical September.
- Record high
- 105°41° (1995)
- Record low
- 26°−3° (2007)
- Heating degree days
- 21
- Cooling degree days
- 252
Castle Valley in OctoberThis month
Highs average 72°22° and lows 44°7°, with 1.1 in28 mm of precipitation and 0.1 in0.3 cm of snow in a typical October.
- Record high
- 95°35° (2003)
- Record low
- 16°−9° (2019)
- Heating degree days
- 238
- Cooling degree days
- 26
Castle Valley in November
Highs average 56°13° and lows 33°0°, with 0.56 in14 mm of precipitation and 0.7 in1.8 cm of snow in a typical November.
- Record high
- 79°26° (2001)
- Record low
- 10°−12° (2005)
- Heating degree days
- 623
- Cooling degree days
- 0
Castle Valley in December
Highs average 42°5° and lows 24°−5°, with 0.61 in15 mm of precipitation and 4 in9 cm of snow in a typical December.
- Record high
- 69°21° (1995)
- Record low
- −4°−20° (1990)
- Heating degree days
- 995
- Cooling degree days
- 0