Green River weather by month
What a typical year looks like in Green River, Wyoming: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at GREEN RIVER, 0 km from Green River; records cover 1897–2026.
The year at a glance
- Precipitation a year
- 10.3 in262 mm
- Snow a year
- 38 in98 cm
- Last spring freeze
- May 22
- First fall freeze
- Sep 17
- Heating degree days
- 7,938
- Cooling degree days
- 349
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −15°−26° (heating, 99%) and 95°35° (cooling, 1%).
Month by month
Green River in January
Highs average 31°−1° and lows 8°−13°, with 0.69 in18 mm of precipitation and 6 in16 cm of snow in a typical January.
- Record high
- 59°15° (1920)
- Record low
- −40° (1979)
- Heating degree days
- 1409
- Cooling degree days
- 0
Green River in February
Highs average 36°2° and lows 13°−11°, with 0.51 in13 mm of precipitation and 8 in19 cm of snow in a typical February.
- Record high
- 68°20° (1951)
- Record low
- −41° (1985)
- Heating degree days
- 1134
- Cooling degree days
- 0
Green River in March
Highs average 47°8° and lows 23°−5°, with 0.84 in21 mm of precipitation and 5 in14 cm of snow in a typical March.
- Record high
- 84°29° (2026)
- Record low
- −26°−32° (1960)
- Heating degree days
- 936
- Cooling degree days
- 0
Green River in April
Highs average 56°14° and lows 29°−1°, with 1.3 in34 mm of precipitation and 4 in10 cm of snow in a typical April.
- Record high
- 86°30° (1939)
- Record low
- −2°−19° (1922)
- Heating degree days
- 664
- Cooling degree days
- 0
Green River in May
Highs average 66°19° and lows 38°3°, with 1.7 in42 mm of precipitation and 0.9 in2.3 cm of snow in a typical May.
- Record high
- 94°34° (1983)
- Record low
- 13°−11° (1972)
- Heating degree days
- 408
- Cooling degree days
- 2
Green River in June
Highs average 78°26° and lows 46°8°, with 0.92 in23 mm of precipitation in a typical June.
- Record high
- 103°39° (1940)
- Record low
- 22°−6° (1990)
- Heating degree days
- 140
- Cooling degree days
- 44
Green River in July
Highs average 87°30° and lows 53°12°, with 0.49 in12 mm of precipitation in a typical July.
- Record high
- 104°40° (1954)
- Record low
- 31°−1° (1913)
- Heating degree days
- 23
- Cooling degree days
- 170
Green River in August
Highs average 85°29° and lows 51°10°, with 0.64 in16 mm of precipitation in a typical August.
- Record high
- 100°38° (1940)
- Record low
- 23°−5° (1908)
- Heating degree days
- 32
- Cooling degree days
- 120
Green River in September
Highs average 76°24° and lows 41°5°, with 0.87 in22 mm of precipitation and 0.3 in0.8 cm of snow in a typical September.
- Record high
- 98°37° (1998)
- Record low
- 4°−16° (1965)
- Heating degree days
- 214
- Cooling degree days
- 13
Green River in OctoberThis month
Highs average 61°16° and lows 30°−1°, with 1 in26 mm of precipitation and 2.4 in6.1 cm of snow in a typical October.
- Record high
- 89°32° (1906)
- Record low
- −9°−23° (2019)
- Heating degree days
- 605
- Cooling degree days
- 0
Green River in November
Highs average 44°7° and lows 19°−7°, with 0.69 in18 mm of precipitation and 5 in13 cm of snow in a typical November.
- Record high
- 73°23° (1931)
- Record low
- −19°−28° (1979)
- Heating degree days
- 1006
- Cooling degree days
- 0
Green River in December
Highs average 32°0° and lows 10°−12°, with 0.63 in16 mm of precipitation and 7 in17 cm of snow in a typical December.
- Record high
- 66°19° (1939)
- Record low
- −42°−41° (1978)
- Heating degree days
- 1367
- Cooling degree days
- 0