Hartville weather by month
What a typical year looks like in Hartville, Wyoming: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Whalen Dam (usbr), 12 km from Hartville; records cover 1949–2026.
The year at a glance
- Precipitation a year
- 14.1 in359 mm
- Snow a year
- Rare
- Last spring freeze
- May 12
- First fall freeze
- Sep 28
- Heating degree days
- 6,730
- Cooling degree days
- 618
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −10°−23° (heating, 99%) and 98°37° (cooling, 1%).
Month by month
Hartville in January
Highs average 41°5° and lows 14°−10°, with 0.25 in6.4 mm of precipitation in a typical January.
- Record high
- 71°22° (2015)
- Record low
- −35°−37° (1963)
- Heating degree days
- 1166
- Cooling degree days
- 0
Hartville in February
Highs average 42°5° and lows 15°−9°, with 0.38 in9.7 mm of precipitation in a typical February.
- Record high
- 75°24° (1962)
- Record low
- −32°−36° (1982)
- Heating degree days
- 1024
- Cooling degree days
- 0
Hartville in March
Highs average 53°12° and lows 24°−5°, with 0.8 in20 mm of precipitation in a typical March.
- Record high
- 88°31° (2026)
- Record low
- −20°−29° (1962)
- Heating degree days
- 828
- Cooling degree days
- 0
Hartville in April
Highs average 60°15° and lows 32°0°, with 1.8 in45 mm of precipitation in a typical April.
- Record high
- 89°32° (1953)
- Record low
- −10°−23° (1975)
- Heating degree days
- 579
- Cooling degree days
- 0
Hartville in May
Highs average 69°20° and lows 42°5°, with 2.7 in69 mm of precipitation in a typical May.
- Record high
- 96°36° (1969)
- Record low
- 19°−7° (1983)
- Heating degree days
- 315
- Cooling degree days
- 13
Hartville in June
Highs average 81°27° and lows 51°11°, with 2.1 in53 mm of precipitation in a typical June.
- Record high
- 114°46° (1988)
- Record low
- 21°−6° (1969)
- Heating degree days
- 58
- Cooling degree days
- 86
Hartville in July
Highs average 88°31° and lows 58°14°, with 1.8 in45 mm of precipitation in a typical July.
- Record high
- 108°42° (1989)
- Record low
- 36°2° (1987)
- Heating degree days
- 3
- Cooling degree days
- 254
Hartville in August
Highs average 87°31° and lows 56°13°, with 1.3 in32 mm of precipitation in a typical August.
- Record high
- 106°41° (1979)
- Record low
- 34°1° (1964)
- Heating degree days
- 13
- Cooling degree days
- 214
Hartville in September
Highs average 78°25° and lows 46°8°, with 1.2 in31 mm of precipitation in a typical September.
- Record high
- 102°39° (1954)
- Record low
- 14°−10° (1984)
- Heating degree days
- 149
- Cooling degree days
- 50
Hartville in OctoberThis month
Highs average 63°17° and lows 32°0°, with 1.1 in28 mm of precipitation in a typical October.
- Record high
- 91°33° (1953)
- Record low
- −10°−23° (2020)
- Heating degree days
- 537
- Cooling degree days
- 1
Hartville in November
Highs average 50°10° and lows 22°−6°, with 0.45 in11 mm of precipitation in a typical November.
- Record high
- 80°27° (1983)
- Record low
- −17°−27° (1986)
- Heating degree days
- 876
- Cooling degree days
- 0
Hartville in December
Highs average 41°5° and lows 13°−10°, with 0.3 in7.6 mm of precipitation in a typical December.
- Record high
- 72°22° (2021)
- Record low
- −43°−42° (1989)
- Heating degree days
- 1182
- Cooling degree days
- 0