Amherst weather by month
What a typical year looks like in Amherst, Colorado: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at HOLYOKE, 21 km from Amherst; records cover 1897–2026.
The year at a glance
- Precipitation a year
- 17.9 in455 mm
- Snow a year
- 30 in77 cm
- Last spring freeze
- May 9
- First fall freeze
- Oct 6
- Heating degree days
- 6,545
- Cooling degree days
- 700
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −7°−22° (heating, 99%) and 99°37° (cooling, 1%).
Month by month
Amherst in January
Highs average 42°5° and lows 13°−11°, with 0.32 in8.1 mm of precipitation and 5 in11 cm of snow in a typical January.
- Record high
- 76°24° (2015)
- Record low
- −27°−33° (1905)
- Heating degree days
- 1173
- Cooling degree days
- 0
Amherst in February
Highs average 44°7° and lows 15°−10°, with 0.51 in13 mm of precipitation and 6 in15 cm of snow in a typical February.
- Record high
- 80°27° (1962)
- Record low
- −36°−38° (1899)
- Heating degree days
- 998
- Cooling degree days
- 0
Amherst in March
Highs average 54°12° and lows 23°−5°, with 0.86 in22 mm of precipitation and 4 in11 cm of snow in a typical March.
- Record high
- 94°34° (2026)
- Record low
- −23°−31° (1960)
- Heating degree days
- 825
- Cooling degree days
- 0
Amherst in April
Highs average 62°17° and lows 31°0°, with 1.9 in49 mm of precipitation and 4 in9 cm of snow in a typical April.
- Record high
- 93°34° (2012)
- Record low
- −4°−20° (1936)
- Heating degree days
- 557
- Cooling degree days
- 1
Amherst in May
Highs average 71°22° and lows 43°6°, with 2.8 in72 mm of precipitation and 0.2 in0.5 cm of snow in a typical May.
- Record high
- 99°37° (1962)
- Record low
- 8°−13° (1907)
- Heating degree days
- 281
- Cooling degree days
- 24
Amherst in June
Highs average 83°28° and lows 53°12°, with 2.8 in70 mm of precipitation in a typical June.
- Record high
- 110°43° (2012)
- Record low
- 30°−1° (1917)
- Heating degree days
- 52
- Cooling degree days
- 136
Amherst in July
Highs average 88°31° and lows 59°15°, with 2.8 in70 mm of precipitation in a typical July.
- Record high
- 110°43° (1936)
- Record low
- 37°3° (1952)
- Heating degree days
- 7
- Cooling degree days
- 264
Amherst in August
Highs average 86°30° and lows 56°13°, with 2.4 in61 mm of precipitation in a typical August.
- Record high
- 107°42° (1914)
- Record low
- 36°2° (1928)
- Heating degree days
- 17
- Cooling degree days
- 206
Amherst in September
Highs average 79°26° and lows 47°8°, with 1.4 in36 mm of precipitation and 0.2 in0.5 cm of snow in a typical September.
- Record high
- 105°41° (1899)
- Record low
- 16°−9° (2000)
- Heating degree days
- 138
- Cooling degree days
- 66
Amherst in OctoberThis month
Highs average 65°18° and lows 33°0°, with 1.2 in31 mm of precipitation and 1.9 in4.8 cm of snow in a typical October.
- Record high
- 98°37° (1938)
- Record low
- −12°−24° (1917)
- Heating degree days
- 497
- Cooling degree days
- 3
Amherst in November
Highs average 53°11° and lows 21°−6°, with 0.52 in13 mm of precipitation and 4 in10 cm of snow in a typical November.
- Record high
- 88°31° (1901)
- Record low
- −12°−24° (1952)
- Heating degree days
- 842
- Cooling degree days
- 0
Amherst in December
Highs average 42°6° and lows 13°−11°, with 0.44 in11 mm of precipitation and 6 in14 cm of snow in a typical December.
- Record high
- 80°27° (1939)
- Record low
- −35°−37° (1919)
- Heating degree days
- 1158
- Cooling degree days
- 0
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