Fontenelle weather by month
What a typical year looks like in Fontenelle, Wyoming: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Fontenelle Dam, 2 km from Fontenelle; records cover 1963–2026.
The year at a glance
- Precipitation a year
- 7.5 in192 mm
- Snow a year
- 27 in67 cm
- Last spring freeze
- Jun 13
- First fall freeze
- Aug 26
- Heating degree days
- 9,854
- Cooling degree days
- 108
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −25°−32° (heating, 99%) and 90°32° (cooling, 1%).
Month by month
Fontenelle in January
Highs average 29°−2° and lows 0°−18°, with 0.35 in8.9 mm of precipitation and 5 in14 cm of snow in a typical January.
- Record high
- 53°12° (2015)
- Record low
- −43°−42° (1979)
- Heating degree days
- 1576
- Cooling degree days
- 0
Fontenelle in February
Highs average 31°0° and lows 3°−16°, with 0.36 in9.1 mm of precipitation and 7 in17 cm of snow in a typical February.
- Record high
- 57°14° (1977)
- Record low
- −46°−43° (1985)
- Heating degree days
- 1338
- Cooling degree days
- 0
Fontenelle in March
Highs average 43°6° and lows 15°−10°, with 0.5 in13 mm of precipitation and 4 in10 cm of snow in a typical March.
- Record high
- 75°24° (2026)
- Record low
- −33°−36° (1993)
- Heating degree days
- 1128
- Cooling degree days
- 0
Fontenelle in April
Highs average 52°11° and lows 21°−6°, with 0.78 in20 mm of precipitation and 2.2 in5.6 cm of snow in a typical April.
- Record high
- 79°26° (1992)
- Record low
- −9°−23° (1977)
- Heating degree days
- 848
- Cooling degree days
- 0
Fontenelle in May
Highs average 63°17° and lows 31°−1°, with 1.4 in36 mm of precipitation and 0.6 in1.5 cm of snow in a typical May.
- Record high
- 87°31° (2020)
- Record low
- 6°−14° (2002)
- Heating degree days
- 563
- Cooling degree days
- 0
Fontenelle in June
Highs average 74°23° and lows 38°4°, with 0.83 in21 mm of precipitation in a typical June.
- Record high
- 94°34° (1988)
- Record low
- 14°−10° (2001)
- Heating degree days
- 274
- Cooling degree days
- 10
Fontenelle in July
Highs average 83°29° and lows 45°7°, with 0.46 in12 mm of precipitation in a typical July.
- Record high
- 100°38° (2007)
- Record low
- 21°−6° (1997)
- Heating degree days
- 90
- Cooling degree days
- 60
Fontenelle in August
Highs average 82°28° and lows 43°6°, with 0.73 in19 mm of precipitation in a typical August.
- Record high
- 95°35° (1979)
- Record low
- 17°−8° (1992)
- Heating degree days
- 120
- Cooling degree days
- 36
Fontenelle in September
Highs average 71°22° and lows 34°1°, with 0.85 in22 mm of precipitation in a typical September.
- Record high
- 93°34° (2022)
- Record low
- 4°−16° (1985)
- Heating degree days
- 379
- Cooling degree days
- 2
Fontenelle in OctoberThis month
Highs average 57°14° and lows 23°−5°, with 0.66 in17 mm of precipitation and 1.3 in3.3 cm of snow in a typical October.
- Record high
- 81°27° (2010)
- Record low
- −23°−31° (2019)
- Heating degree days
- 786
- Cooling degree days
- 0
Fontenelle in November
Highs average 41°5° and lows 10°−12°, with 0.34 in8.6 mm of precipitation and 2.1 in5.3 cm of snow in a typical November.
- Record high
- 70°21° (2020)
- Record low
- −29°−34° (1976)
- Heating degree days
- 1182
- Cooling degree days
- 0
Fontenelle in December
Highs average 29°−2° and lows 0°−18°, with 0.26 in6.6 mm of precipitation and 5 in11 cm of snow in a typical December.
- Record high
- 60°16° (2021)
- Record low
- −46°−43° (1978)
- Heating degree days
- 1570
- Cooling degree days
- 0