Arapahoe weather by month
What a typical year looks like in Arapahoe, Colorado: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Arapahoe 12s, 19 km from Arapahoe; records cover 2003–2026.
The year at a glance
- Precipitation a year
- 17.5 in445 mm
- Snow a year
- 20 in52 cm
- Last spring freeze
- May 2
- First fall freeze
- Oct 10
- Heating degree days
- 5,675
- Cooling degree days
- 968
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −3°−19° (heating, 99%) and 102°39° (cooling, 1%).
Month by month
Arapahoe in January
Highs average 45°7° and lows 16°−9°, with 0.42 in11 mm of precipitation and 2.5 in6.4 cm of snow in a typical January.
- Record high
- 79°26° (2026)
- Record low
- −22°−30° (2014)
- Heating degree days
- 1071
- Cooling degree days
- 0
Arapahoe in February
Highs average 47°8° and lows 19°−7°, with 0.56 in14 mm of precipitation and 5 in11 cm of snow in a typical February.
- Record high
- 83°28° (2017)
- Record low
- −24°−31° (2021)
- Heating degree days
- 901
- Cooling degree days
- 0
Arapahoe in March
Highs average 57°14° and lows 26°−4°, with 0.92 in23 mm of precipitation and 2.3 in5.8 cm of snow in a typical March.
- Record high
- 97°36° (2012)
- Record low
- −19°−28° (2014)
- Heating degree days
- 733
- Cooling degree days
- 1
Arapahoe in April
Highs average 66°19° and lows 34°1°, with 1.4 in37 mm of precipitation and 1.8 in4.6 cm of snow in a typical April.
- Record high
- 95°35° (2012)
- Record low
- 12°−11° (2013)
- Heating degree days
- 460
- Cooling degree days
- 3
Arapahoe in May
Highs average 75°24° and lows 44°7°, with 2 in50 mm of precipitation and 0.1 in0.3 cm of snow in a typical May.
- Record high
- 101°38° (2005)
- Record low
- 25°−4° (2008)
- Heating degree days
- 204
- Cooling degree days
- 40
Arapahoe in June
Highs average 86°30° and lows 55°13°, with 2.4 in61 mm of precipitation in a typical June.
- Record high
- 109°43° (2012)
- Record low
- 34°1° (2004)
- Heating degree days
- 30
- Cooling degree days
- 192
Arapahoe in July
Highs average 91°33° and lows 61°16°, with 3.3 in83 mm of precipitation in a typical July.
- Record high
- 111°44° (2026)
- Record low
- 39°4° (2004)
- Heating degree days
- 3
- Cooling degree days
- 344
Arapahoe in August
Highs average 88°31° and lows 59°15°, with 2.9 in74 mm of precipitation in a typical August.
- Record high
- 106°41° (2026)
- Record low
- 41°5° (2004)
- Heating degree days
- 6
- Cooling degree days
- 271
Arapahoe in September
Highs average 81°27° and lows 50°10°, with 1.1 in28 mm of precipitation in a typical September.
- Record high
- 105°41° (2011)
- Record low
- 31°−1° (2020)
- Heating degree days
- 87
- Cooling degree days
- 108
Arapahoe in OctoberThis month
Highs average 69°20° and lows 36°2°, with 1.5 in38 mm of precipitation and 0.9 in2.3 cm of snow in a typical October.
- Record high
- 99°37° (2024)
- Record low
- 3°−16° (2020)
- Heating degree days
- 396
- Cooling degree days
- 9
Arapahoe in November
Highs average 56°13° and lows 25°−4°, with 0.43 in11 mm of precipitation and 2.1 in5.3 cm of snow in a typical November.
- Record high
- 85°29° (2016)
- Record low
- −7°−22° (2014)
- Heating degree days
- 738
- Cooling degree days
- 0
Arapahoe in December
Highs average 45°7° and lows 18°−8°, with 0.59 in15 mm of precipitation and 6 in15 cm of snow in a typical December.
- Record high
- 80°27° (2025)
- Record low
- −15°−26° (2016)
- Heating degree days
- 1046
- Cooling degree days
- 0
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