Evanston weather by month
What a typical year looks like in Evanston, Wyoming: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at EVANSTON 1 E, 2 km from Evanston; records cover 1890–2026.
The year at a glance
- Precipitation a year
- 12.1 in308 mm
- Snow a year
- Rare
- Last spring freeze
- Jun 14
- First fall freeze
- Sep 11
- Heating degree days
- 8,456
- Cooling degree days
- 84
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −9°−23° (heating, 99%) and 88°31° (cooling, 1%).
Month by month
Evanston in January
Highs average 33°0° and lows 11°−12°, with 0.84 in21 mm of precipitation in a typical January.
- Record high
- 57°14° (1981)
- Record low
- −35°−37° (1949)
- Heating degree days
- 1338
- Cooling degree days
- 0
Evanston in February
Highs average 35°1° and lows 13°−10°, with 0.6 in15 mm of precipitation in a typical February.
- Record high
- 70°21° (1986)
- Record low
- −38°−39° (1905)
- Heating degree days
- 1149
- Cooling degree days
- 0
Evanston in March
Highs average 44°7° and lows 21°−6°, with 0.74 in19 mm of precipitation in a typical March.
- Record high
- 75°24° (1985)
- Record low
- −30°−34° (1917)
- Heating degree days
- 1004
- Cooling degree days
- 0
Evanston in April
Highs average 53°12° and lows 27°−3°, with 0.98 in25 mm of precipitation in a typical April.
- Record high
- 82°28° (1985)
- Record low
- −7°−22° (1920)
- Heating degree days
- 746
- Cooling degree days
- 0
Evanston in May
Highs average 63°17° and lows 35°1°, with 1.9 in48 mm of precipitation in a typical May.
- Record high
- 88°31° (1948)
- Record low
- 9°−13° (1965)
- Heating degree days
- 501
- Cooling degree days
- 0
Evanston in June
Highs average 73°23° and lows 41°5°, with 1.1 in29 mm of precipitation in a typical June.
- Record high
- 94°34° (1988)
- Record low
- 19°−7° (1960)
- Heating degree days
- 243
- Cooling degree days
- 5
Evanston in July
Highs average 81°27° and lows 48°9°, with 0.77 in20 mm of precipitation in a typical July.
- Record high
- 99°37° (1985)
- Record low
- 24°−4° (1921)
- Heating degree days
- 68
- Cooling degree days
- 49
Evanston in August
Highs average 80°26° and lows 47°8°, with 1.1 in28 mm of precipitation in a typical August.
- Record high
- 94°34° (1940)
- Record low
- 23°−5° (1962)
- Heating degree days
- 85
- Cooling degree days
- 28
Evanston in September
Highs average 71°22° and lows 39°4°, with 1.2 in30 mm of precipitation in a typical September.
- Record high
- 93°34° (2022)
- Record low
- 5°−15° (1926)
- Heating degree days
- 312
- Cooling degree days
- 2
Evanston in OctoberThis month
Highs average 58°14° and lows 30°−1°, with 1.2 in29 mm of precipitation in a typical October.
- Record high
- 82°28° (2024)
- Record low
- −8°−22° (1972)
- Heating degree days
- 660
- Cooling degree days
- 0
Evanston in November
Highs average 43°6° and lows 19°−7°, with 1 in26 mm of precipitation in a typical November.
- Record high
- 69°21° (1965)
- Record low
- −22°−30° (1955)
- Heating degree days
- 1014
- Cooling degree days
- 0
Evanston in December
Highs average 33°0° and lows 11°−12°, with 0.71 in18 mm of precipitation in a typical December.
- Record high
- 64°18° (1939)
- Record low
- −34°−37° (1951)
- Heating degree days
- 1336
- Cooling degree days
- 0