Shell weather by month
What a typical year looks like in Shell, Wyoming: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Shell, 1 km from Shell; records cover 1972–2026.
The year at a glance
- Precipitation a year
- 10.1 in257 mm
- Snow a year
- 28 in72 cm
- Last spring freeze
- May 14
- First fall freeze
- Sep 17
- Heating degree days
- 7,811
- Cooling degree days
- 465
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −17°−27° (heating, 99%) and 98°37° (cooling, 1%).
Month by month
Shell in January
Highs average 33°0° and lows 6°−14°, with 0.47 in12 mm of precipitation and 7 in19 cm of snow in a typical January.
- Record high
- 61°16° (1974)
- Record low
- −36°−38° (1997)
- Heating degree days
- 1409
- Cooling degree days
- 0
Shell in February
Highs average 37°3° and lows 11°−12°, with 0.5 in13 mm of precipitation and 6 in16 cm of snow in a typical February.
- Record high
- 68°20° (2026)
- Record low
- −36°−38° (1989)
- Heating degree days
- 1145
- Cooling degree days
- 0
Shell in March
Highs average 50°10° and lows 22°−5°, with 0.49 in12 mm of precipitation and 2.7 in6.9 cm of snow in a typical March.
- Record high
- 82°28° (2025)
- Record low
- −23°−31° (2019)
- Heating degree days
- 898
- Cooling degree days
- 0
Shell in April
Highs average 59°15° and lows 29°−1°, with 1.1 in27 mm of precipitation and 1.4 in3.6 cm of snow in a typical April.
- Record high
- 88°31° (1974)
- Record low
- −1°−18° (2020)
- Heating degree days
- 630
- Cooling degree days
- 0
Shell in May
Highs average 69°20° and lows 39°4°, with 1.9 in48 mm of precipitation in a typical May.
- Record high
- 93°34° (1988)
- Record low
- 12°−11° (1982)
- Heating degree days
- 351
- Cooling degree days
- 6
Shell in June
Highs average 79°26° and lows 47°8°, with 1.4 in34 mm of precipitation in a typical June.
- Record high
- 106°41° (2021)
- Record low
- 28°−2° (1987)
- Heating degree days
- 117
- Cooling degree days
- 61
Shell in July
Highs average 89°32° and lows 54°12°, with 0.72 in18 mm of precipitation in a typical July.
- Record high
- 106°41° (2002)
- Record low
- 27°−3° (1974)
- Heating degree days
- 17
- Cooling degree days
- 212
Shell in August
Highs average 87°31° and lows 51°11°, with 0.46 in12 mm of precipitation in a typical August.
- Record high
- 104°40° (2001)
- Record low
- 31°−1° (2001)
- Heating degree days
- 35
- Cooling degree days
- 157
Shell in September
Highs average 76°24° and lows 42°5°, with 1.1 in27 mm of precipitation in a typical September.
- Record high
- 102°39° (2022)
- Record low
- 12°−11° (1984)
- Heating degree days
- 216
- Cooling degree days
- 28
Shell in OctoberThis month
Highs average 60°16° and lows 30°−1°, with 0.99 in25 mm of precipitation and 0.9 in2.3 cm of snow in a typical October.
- Record high
- 90°32° (2011)
- Record low
- −7°−22° (2020)
- Heating degree days
- 622
- Cooling degree days
- 1
Shell in November
Highs average 45°7° and lows 18°−8°, with 0.68 in17 mm of precipitation and 4 in10 cm of snow in a typical November.
- Record high
- 78°26° (1980)
- Record low
- −22°−30° (1985)
- Heating degree days
- 999
- Cooling degree days
- 0
Shell in December
Highs average 34°1° and lows 8°−13°, with 0.44 in11 mm of precipitation and 6 in14 cm of snow in a typical December.
- Record high
- 75°24° (2002)
- Record low
- −43°−42° (1983)
- Heating degree days
- 1372
- Cooling degree days
- 0