Jeffrey City weather by month
What a typical year looks like in Jeffrey City, Wyoming: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Jeffrey City, 1 km from Jeffrey City; records cover 1964–2026.
The year at a glance
- Precipitation a year
- 9.9 in251 mm
- Snow a year
- 60 in153 cm
- Last spring freeze
- May 30
- First fall freeze
- Sep 12
- Heating degree days
- 8,486
- Cooling degree days
- 229
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −18°−28° (heating, 99%) and 93°34° (cooling, 1%).
Month by month
Jeffrey City in January
Highs average 31°−1° and lows 9°−13°, with 0.35 in8.9 mm of precipitation and 5 in13 cm of snow in a typical January.
- Record high
- 57°14° (1981)
- Record low
- −49°−45° (2023)
- Heating degree days
- 1395
- Cooling degree days
- 0
Jeffrey City in February
Highs average 34°1° and lows 11°−12°, with 0.5 in13 mm of precipitation and 7 in18 cm of snow in a typical February.
- Record high
- 60°16° (1982)
- Record low
- −39° (2023)
- Heating degree days
- 1194
- Cooling degree days
- 0
Jeffrey City in March
Highs average 45°7° and lows 20°−7°, with 0.79 in20 mm of precipitation and 9 in22 cm of snow in a typical March.
- Record high
- 78°26° (2026)
- Record low
- −33°−36° (2022)
- Heating degree days
- 1018
- Cooling degree days
- 0
Jeffrey City in April
Highs average 54°12° and lows 26°−3°, with 1.4 in36 mm of precipitation and 12 in31 cm of snow in a typical April.
- Record high
- 80°27° (2007)
- Record low
- −18°−28° (1966)
- Heating degree days
- 745
- Cooling degree days
- 0
Jeffrey City in May
Highs average 64°18° and lows 35°2°, with 2 in50 mm of precipitation and 6 in14 cm of snow in a typical May.
- Record high
- 92°33° (1964)
- Record low
- 11°−12° (2013)
- Heating degree days
- 478
- Cooling degree days
- 1
Jeffrey City in June
Highs average 76°25° and lows 43°6°, with 0.97 in25 mm of precipitation and 0.4 in1 cm of snow in a typical June.
- Record high
- 99°37° (1985)
- Record low
- 27°−3° (1982)
- Heating degree days
- 180
- Cooling degree days
- 24
Jeffrey City in July
Highs average 85°30° and lows 50°10°, with 0.66 in17 mm of precipitation in a typical July.
- Record high
- 101°38° (2026)
- Record low
- 32°0° (1993)
- Heating degree days
- 33
- Cooling degree days
- 113
Jeffrey City in August
Highs average 83°29° and lows 48°9°, with 0.54 in14 mm of precipitation in a typical August.
- Record high
- 99°37° (2026)
- Record low
- 28°−2° (1964)
- Heating degree days
- 56
- Cooling degree days
- 82
Jeffrey City in September
Highs average 73°23° and lows 39°4°, with 0.82 in21 mm of precipitation and 1.3 in3.3 cm of snow in a typical September.
- Record high
- 94°34° (2020)
- Record low
- 1°−17° (1965)
- Heating degree days
- 280
- Cooling degree days
- 9
Jeffrey City in OctoberThis month
Highs average 58°14° and lows 29°−2°, with 0.91 in23 mm of precipitation and 7 in19 cm of snow in a typical October.
- Record high
- 87°31° (2024)
- Record low
- −27°−33° (2019)
- Heating degree days
- 673
- Cooling degree days
- 0
Jeffrey City in November
Highs average 42°6° and lows 18°−8°, with 0.51 in13 mm of precipitation and 6 in16 cm of snow in a typical November.
- Record high
- 69°21° (2020)
- Record low
- −31°−35° (2014)
- Heating degree days
- 1047
- Cooling degree days
- 0
Jeffrey City in December
Highs average 31°−1° and lows 10°−12°, with 0.46 in12 mm of precipitation and 6 in16 cm of snow in a typical December.
- Record high
- 62°17° (2021)
- Record low
- −46°−43° (1990)
- Heating degree days
- 1387
- Cooling degree days
- 0