Ralston weather by month
What a typical year looks like in Ralston, Wyoming: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Powell Field Station, 13 km from Ralston; records cover 1981–2026.
The year at a glance
- Precipitation a year
- 6.7 in170 mm
- Snow a year
- 11 in28 cm
- Last spring freeze
- May 14
- First fall freeze
- Sep 20
- Heating degree days
- 8,226
- Cooling degree days
- 328
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −13°−25° (heating, 99%) and 96°36° (cooling, 1%).
Month by month
Ralston in January
Highs average 32°0° and lows 6°−14°, with 0.18 in4.6 mm of precipitation and 2.6 in6.6 cm of snow in a typical January.
- Record high
- 66°19° (2026)
- Record low
- −27°−33° (1996)
- Heating degree days
- 1432
- Cooling degree days
- 0
Ralston in February
Highs average 36°2° and lows 10°−12°, with 0.18 in4.6 mm of precipitation and 1.8 in4.6 cm of snow in a typical February.
- Record high
- 70°21° (2026)
- Record low
- −33°−36° (1989)
- Heating degree days
- 1176
- Cooling degree days
- 0
Ralston in March
Highs average 48°9° and lows 20°−7°, with 0.26 in6.6 mm of precipitation and 1.7 in4.3 cm of snow in a typical March.
- Record high
- 81°27° (2025)
- Record low
- −22°−30° (2019)
- Heating degree days
- 963
- Cooling degree days
- 0
Ralston in April
Highs average 57°14° and lows 28°−2°, with 0.57 in14 mm of precipitation and 0.8 in2 cm of snow in a typical April.
- Record high
- 85°29° (1989)
- Record low
- −3°−19° (2018)
- Heating degree days
- 671
- Cooling degree days
- 0
Ralston in May
Highs average 66°19° and lows 40°4°, with 1.2 in31 mm of precipitation and 0.1 in0.3 cm of snow in a typical May.
- Record high
- 93°34° (1986)
- Record low
- 8°−13° (2026)
- Heating degree days
- 386
- Cooling degree days
- 6
Ralston in June
Highs average 76°24° and lows 47°8°, with 1.3 in34 mm of precipitation in a typical June.
- Record high
- 104°40° (1988)
- Record low
- 1°−17° (2026)
- Heating degree days
- 149
- Cooling degree days
- 45
Ralston in July
Highs average 85°30° and lows 52°11°, with 0.77 in20 mm of precipitation in a typical July.
- Record high
- 104°40° (2002)
- Record low
- 30°−1° (2019)
- Heating degree days
- 34
- Cooling degree days
- 152
Ralston in August
Highs average 84°29° and lows 50°10°, with 0.42 in11 mm of precipitation in a typical August.
- Record high
- 102°39° (2003)
- Record low
- 32°0° (1987)
- Heating degree days
- 55
- Cooling degree days
- 108
Ralston in September
Highs average 73°23° and lows 41°5°, with 0.76 in19 mm of precipitation in a typical September.
- Record high
- 102°39° (2024)
- Record low
- 16°−9° (1984)
- Heating degree days
- 260
- Cooling degree days
- 17
Ralston in OctoberThis month
Highs average 58°14° and lows 29°−2°, with 0.7 in18 mm of precipitation and 1.1 in2.8 cm of snow in a typical October.
- Record high
- 94°34° (2024)
- Record low
- −5°−21° (1991)
- Heating degree days
- 670
- Cooling degree days
- 0
Ralston in November
Highs average 43°6° and lows 17°−8°, with 0.21 in5.3 mm of precipitation and 1.6 in4.1 cm of snow in a typical November.
- Record high
- 78°26° (2024)
- Record low
- −18°−28° (1985)
- Heating degree days
- 1048
- Cooling degree days
- 0
Ralston in December
Highs average 33°0° and lows 8°−13°, with 0.1 in2.5 mm of precipitation and 1.5 in3.8 cm of snow in a typical December.
- Record high
- 69°21° (2021)
- Record low
- −34°−37° (1990)
- Heating degree days
- 1382
- Cooling degree days
- 0