Boulder weather by month
What a typical year looks like in Boulder, Utah: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Escalante, 23 km from Boulder; records cover 1901–2026.
The year at a glance
- Precipitation a year
- 10.6 in268 mm
- Snow a year
- 25 in65 cm
- Last spring freeze
- May 7
- First fall freeze
- Oct 5
- Heating degree days
- 5,507
- Cooling degree days
- 749
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 5°−15° (heating, 99%) and 100°38° (cooling, 1%).
Month by month
Boulder in January
Highs average 43°6° and lows 19°−7°, with 1 in26 mm of precipitation and 9 in23 cm of snow in a typical January.
- Record high
- 68°20° (1971)
- Record low
- −22°−30° (1937)
- Heating degree days
- 1056
- Cooling degree days
- 0
Boulder in February
Highs average 48°9° and lows 23°−5°, with 0.94 in24 mm of precipitation and 6 in15 cm of snow in a typical February.
- Record high
- 76°24° (1912)
- Record low
- −21°−29° (1933)
- Heating degree days
- 822
- Cooling degree days
- 0
Boulder in March
Highs average 58°14° and lows 29°−1°, with 0.75 in19 mm of precipitation and 2.2 in5.6 cm of snow in a typical March.
- Record high
- 87°31° (2026)
- Record low
- 2°−17° (1922)
- Heating degree days
- 662
- Cooling degree days
- 0
Boulder in April
Highs average 66°19° and lows 35°2°, with 0.45 in11 mm of precipitation and 1.4 in3.6 cm of snow in a typical April.
- Record high
- 88°31° (2000)
- Record low
- 10°−12° (1933)
- Heating degree days
- 446
- Cooling degree days
- 0
Boulder in May
Highs average 76°24° and lows 42°5°, with 0.59 in15 mm of precipitation in a typical May.
- Record high
- 98°37° (2002)
- Record low
- 23°−5° (1967)
- Heating degree days
- 214
- Cooling degree days
- 18
Boulder in June
Highs average 87°31° and lows 50°10°, with 0.4 in10 mm of precipitation in a typical June.
- Record high
- 105°41° (2013)
- Record low
- 25°−4° (1932)
- Heating degree days
- 34
- Cooling degree days
- 141
Boulder in July
Highs average 92°34° and lows 57°14°, with 1 in26 mm of precipitation in a typical July.
- Record high
- 106°41° (2021)
- Record low
- 38°3° (1902)
- Heating degree days
- 1
- Cooling degree days
- 301
Boulder in August
Highs average 89°32° and lows 56°13°, with 1.6 in42 mm of precipitation in a typical August.
- Record high
- 105°41° (2026)
- Record low
- 32°0° (1916)
- Heating degree days
- 3
- Cooling degree days
- 230
Boulder in September
Highs average 81°27° and lows 47°9°, with 1.3 in33 mm of precipitation in a typical September.
- Record high
- 101°38° (2020)
- Record low
- 16°−9° (1924)
- Heating degree days
- 77
- Cooling degree days
- 58
Boulder in OctoberThis month
Highs average 68°20° and lows 37°3°, with 1.3 in32 mm of precipitation and 0.1 in0.3 cm of snow in a typical October.
- Record high
- 92°33° (2010)
- Record low
- 10°−12° (1924)
- Heating degree days
- 387
- Cooling degree days
- 1
Boulder in November
Highs average 54°12° and lows 26°−3°, with 0.52 in13 mm of precipitation and 1.9 in4.8 cm of snow in a typical November.
- Record high
- 78°26° (1937)
- Record low
- −3°−19° (1931)
- Heating degree days
- 747
- Cooling degree days
- 0
Boulder in December
Highs average 43°6° and lows 19°−7°, with 0.68 in17 mm of precipitation and 5 in13 cm of snow in a typical December.
- Record high
- 69°21° (1977)
- Record low
- −20°−29° (1924)
- Heating degree days
- 1058
- Cooling degree days
- 0