Dayton weather by month
What a typical year looks like in Dayton, Wyoming: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Burgess Junction, 23 km from Dayton; records cover 1960–2026.
The year at a glance
- Precipitation a year
- 24.1 in613 mm
- Snow a year
- Rare
- Last spring freeze
- Jun 22
- First fall freeze
- Jul 15
- Heating degree days
- 11,092
- Cooling degree days
- 4
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 80°27° (cooling, 1%).
Month by month
Dayton in January
Highs average 30°−1° and lows 8°−13°, with 1.4 in36 mm of precipitation in a typical January.
- Record high
- 57°14° (2024)
- Record low
- −44°−42° (1963)
- Heating degree days
- 1428
- Cooling degree days
- 0
Dayton in February
Highs average 29°−1° and lows 7°−14°, with 1.7 in42 mm of precipitation in a typical February.
- Record high
- 56°13° (2024)
- Record low
- −45°−43° (1989)
- Heating degree days
- 1314
- Cooling degree days
- 0
Dayton in March
Highs average 35°2° and lows 13°−11°, with 2.1 in53 mm of precipitation in a typical March.
- Record high
- 60°16° (2026)
- Record low
- −24°−31° (1987)
- Heating degree days
- 1276
- Cooling degree days
- 0
Dayton in April
Highs average 41°5° and lows 18°−8°, with 2.8 in71 mm of precipitation in a typical April.
- Record high
- 70°21° (2012)
- Record low
- −18°−28° (1973)
- Heating degree days
- 1068
- Cooling degree days
- 0
Dayton in May
Highs average 50°10° and lows 28°−2°, with 3.5 in89 mm of precipitation in a typical May.
- Record high
- 75°24° (2003)
- Record low
- 0°−18° (1967)
- Heating degree days
- 809
- Cooling degree days
- 0
Dayton in June
Highs average 61°16° and lows 35°2°, with 2.4 in61 mm of precipitation in a typical June.
- Record high
- 87°31° (1988)
- Record low
- 5°−15° (1978)
- Heating degree days
- 498
- Cooling degree days
- 0
Dayton in July
Highs average 71°22° and lows 42°5°, with 1.6 in40 mm of precipitation in a typical July.
- Record high
- 88°31° (2002)
- Record low
- 21°−6° (1971)
- Heating degree days
- 270
- Cooling degree days
- 2
Dayton in August
Highs average 70°21° and lows 41°5°, with 1.2 in30 mm of precipitation in a typical August.
- Record high
- 88°31° (1985)
- Record low
- 20°−7° (1978)
- Heating degree days
- 302
- Cooling degree days
- 2
Dayton in September
Highs average 61°16° and lows 33°1°, with 2 in51 mm of precipitation in a typical September.
- Record high
- 86°30° (2022)
- Record low
- −5°−21° (1985)
- Heating degree days
- 543
- Cooling degree days
- 0
Dayton in OctoberThis month
Highs average 46°8° and lows 23°−5°, with 2.3 in58 mm of precipitation in a typical October.
- Record high
- 74°23° (2010)
- Record low
- −22°−30° (1991)
- Heating degree days
- 942
- Cooling degree days
- 0
Dayton in November
Highs average 36°2° and lows 15°−10°, with 1.6 in41 mm of precipitation in a typical November.
- Record high
- 65°18° (2016)
- Record low
- −28°−33° (2014)
- Heating degree days
- 1196
- Cooling degree days
- 0
Dayton in December
Highs average 29°−2° and lows 8°−13°, with 1.5 in39 mm of precipitation in a typical December.
- Record high
- 55°13° (2020)
- Record low
- −48°−44° (1983)
- Heating degree days
- 1446
- Cooling degree days
- 0