Kirby weather by month
What a typical year looks like in Kirby, Wyoming: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Thermopolis, 17 km from Kirby; records cover 1899–2026.
The year at a glance
- Precipitation a year
- 12 in304 mm
- Snow a year
- 27 in70 cm
- Last spring freeze
- May 11
- First fall freeze
- Oct 3
- Heating degree days
- 6,690
- Cooling degree days
- 737
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 100°38° (cooling, 1%).
Month by month
Kirby in January
Highs average 37°3° and lows 12°−11°, with 0.39 in9.9 mm of precipitation and 5 in14 cm of snow in a typical January.
- Record high
- 67°19° (1953)
- Record low
- −44°−42° (1930)
- Heating degree days
- 1258
- Cooling degree days
- 0
Kirby in February
Highs average 42°5° and lows 16°−9°, with 0.44 in11 mm of precipitation and 5 in12 cm of snow in a typical February.
- Record high
- 70°21° (1951)
- Record low
- −42°−41° (1933)
- Heating degree days
- 1019
- Cooling degree days
- 0
Kirby in March
Highs average 54°12° and lows 26°−4°, with 0.85 in22 mm of precipitation and 2.3 in5.8 cm of snow in a typical March.
- Record high
- 84°29° (2026)
- Record low
- −28°−33° (1906)
- Heating degree days
- 781
- Cooling degree days
- 0
Kirby in April
Highs average 62°17° and lows 33°1°, with 1.6 in41 mm of precipitation and 2.2 in5.6 cm of snow in a typical April.
- Record high
- 89°32° (1910)
- Record low
- −6°−21° (1936)
- Heating degree days
- 521
- Cooling degree days
- 1
Kirby in May
Highs average 71°22° and lows 43°6°, with 2.5 in64 mm of precipitation and 0.2 in0.5 cm of snow in a typical May.
- Record high
- 98°37° (1936)
- Record low
- 12°−11° (1954)
- Heating degree days
- 268
- Cooling degree days
- 18
Kirby in June
Highs average 83°28° and lows 51°10°, with 1.3 in33 mm of precipitation in a typical June.
- Record high
- 105°41° (1954)
- Record low
- 24°−4° (1951)
- Heating degree days
- 62
- Cooling degree days
- 114
Kirby in July
Highs average 92°33° and lows 57°14°, with 0.76 in19 mm of precipitation in a typical July.
- Record high
- 109°43° (2026)
- Record low
- 34°1° (1955)
- Heating degree days
- 5
- Cooling degree days
- 298
Kirby in August
Highs average 90°32° and lows 55°13°, with 0.5 in13 mm of precipitation in a typical August.
- Record high
- 106°41° (1903)
- Record low
- 23°−5° (1910)
- Heating degree days
- 13
- Cooling degree days
- 242
Kirby in September
Highs average 80°27° and lows 46°8°, with 1.2 in31 mm of precipitation and 0.3 in0.8 cm of snow in a typical September.
- Record high
- 104°40° (2022)
- Record low
- 7°−14° (1926)
- Heating degree days
- 130
- Cooling degree days
- 61
Kirby in OctoberThis month
Highs average 65°18° and lows 34°1°, with 1.3 in32 mm of precipitation and 2.1 in5.3 cm of snow in a typical October.
- Record high
- 92°33° (1917)
- Record low
- −11°−24° (2020)
- Heating degree days
- 494
- Cooling degree days
- 3
Kirby in November
Highs average 49°9° and lows 22°−6°, with 0.6 in15 mm of precipitation and 6 in14 cm of snow in a typical November.
- Record high
- 77°25° (1941)
- Record low
- −28°−33° (1916)
- Heating degree days
- 896
- Cooling degree days
- 0
Kirby in December
Highs average 38°3° and lows 12°−11°, with 0.46 in12 mm of precipitation and 5 in11 cm of snow in a typical December.
- Record high
- 78°26° (1939)
- Record low
- −38°−39° (1924)
- Heating degree days
- 1243
- Cooling degree days
- 0