Alamosa weather by month
What a typical year looks like in Alamosa, Colorado: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Alamosa-Bergman Field, 4 km from Alamosa; records cover 1906–2026.
The year at a glance
- Precipitation a year
- 7.4 in188 mm
- Snow a year
- 28 in71 cm
- Last spring freeze
- Jun 8
- First fall freeze
- Sep 13
- Heating degree days
- 8,321
- Cooling degree days
- 71
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −20°−29° (heating, 99%) and 90°32° (cooling, 1%).
Month by month
Alamosa in January
Highs average 35°2° and lows −1°−18°, with 0.32 in8.1 mm of precipitation and 5 in11 cm of snow in a typical January.
- Record high
- 63°17° (2018)
- Record low
- −50°−46° (1948)
- Heating degree days
- 1493
- Cooling degree days
- 0
Alamosa in February
Highs average 41°5° and lows 7°−14°, with 0.28 in7.1 mm of precipitation and 4 in10 cm of snow in a typical February.
- Record high
- 67°19° (2025)
- Record low
- −35°−37° (1948)
- Heating degree days
- 1140
- Cooling degree days
- 0
Alamosa in March
Highs average 53°12° and lows 18°−8°, with 0.54 in14 mm of precipitation and 4 in11 cm of snow in a typical March.
- Record high
- 83°28° (2026)
- Record low
- −20°−29° (1964)
- Heating degree days
- 925
- Cooling degree days
- 0
Alamosa in April
Highs average 60°16° and lows 25°−4°, with 0.57 in14 mm of precipitation and 4 in9 cm of snow in a typical April.
- Record high
- 80°27° (1989)
- Record low
- −6°−21° (1973)
- Heating degree days
- 672
- Cooling degree days
- 0
Alamosa in May
Highs average 70°21° and lows 34°1°, with 0.6 in15 mm of precipitation and 0.8 in2 cm of snow in a typical May.
- Record high
- 90°32° (2002)
- Record low
- 11°−12° (1967)
- Heating degree days
- 412
- Cooling degree days
- 0
Alamosa in June
Highs average 80°27° and lows 41°5°, with 0.43 in11 mm of precipitation in a typical June.
- Record high
- 95°35° (1994)
- Record low
- 23°−5° (1936)
- Heating degree days
- 144
- Cooling degree days
- 10
Alamosa in July
Highs average 83°29° and lows 47°8°, with 1 in26 mm of precipitation in a typical July.
- Record high
- 96°36° (1989)
- Record low
- 28°−2° (2020)
- Heating degree days
- 34
- Cooling degree days
- 43
Alamosa in August
Highs average 81°27° and lows 46°8°, with 1.3 in33 mm of precipitation in a typical August.
- Record high
- 93°34° (2026)
- Record low
- 29°−2° (1964)
- Heating degree days
- 74
- Cooling degree days
- 17
Alamosa in September
Highs average 74°24° and lows 37°3°, with 0.98 in25 mm of precipitation and 0.5 in1.3 cm of snow in a typical September.
- Record high
- 89°32° (2020)
- Record low
- 15°−9° (1985)
- Heating degree days
- 275
- Cooling degree days
- 1
Alamosa in OctoberThis month
Highs average 63°17° and lows 25°−4°, with 0.65 in17 mm of precipitation and 2.2 in5.6 cm of snow in a typical October.
- Record high
- 81°27° (1979)
- Record low
- −9°−23° (1991)
- Heating degree days
- 657
- Cooling degree days
- 0
Alamosa in November
Highs average 49°9° and lows 12°−11°, with 0.37 in9.4 mm of precipitation and 3 in9 cm of snow in a typical November.
- Record high
- 71°22° (1980)
- Record low
- −30°−34° (1952)
- Heating degree days
- 1041
- Cooling degree days
- 0
Alamosa in December
Highs average 35°2° and lows 1°−17°, with 0.34 in8.6 mm of precipitation and 5 in12 cm of snow in a typical December.
- Record high
- 63°17° (2017)
- Record low
- −42°−41° (1964)
- Heating degree days
- 1454
- Cooling degree days
- 0
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