Ashton weather by month
What a typical year looks like in Ashton, Iowa: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Sibley, 11 km from Ashton; records cover 1893–2026.
The year at a glance
- Precipitation a year
- 30.2 in768 mm
- Snow a year
- 42 in105 cm
- Last spring freeze
- May 5
- First fall freeze
- Oct 1
- Heating degree days
- 8,036
- Cooling degree days
- 592
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −16°−27° (heating, 99%) and 92°33° (cooling, 1%).
Month by month
Ashton in January
Highs average 23°−5° and lows 5°−15°, with 0.74 in19 mm of precipitation and 8 in21 cm of snow in a typical January.
- Record high
- 64°18° (1944)
- Record low
- −40° (1912)
- Heating degree days
- 1584
- Cooling degree days
- 0
Ashton in February
Highs average 28°−2° and lows 9°−13°, with 0.84 in21 mm of precipitation and 7 in19 cm of snow in a typical February.
- Record high
- 68°20° (1896)
- Record low
- −40° (1899)
- Heating degree days
- 1305
- Cooling degree days
- 0
Ashton in March
Highs average 41°5° and lows 21°−6°, with 1.6 in40 mm of precipitation and 7 in18 cm of snow in a typical March.
- Record high
- 86°30° (2026)
- Record low
- −30°−34° (1948)
- Heating degree days
- 1060
- Cooling degree days
- 0
Ashton in April
Highs average 56°13° and lows 33°0°, with 3.3 in83 mm of precipitation and 4 in9 cm of snow in a typical April.
- Record high
- 94°34° (1910)
- Record low
- 0°−18° (1936)
- Heating degree days
- 623
- Cooling degree days
- 2
Ashton in May
Highs average 69°20° and lows 46°8°, with 4.1 in103 mm of precipitation in a typical May.
- Record high
- 100°38° (2013)
- Record low
- 15°−9° (1967)
- Heating degree days
- 278
- Cooling degree days
- 34
Ashton in June
Highs average 79°26° and lows 57°14°, with 4.9 in124 mm of precipitation in a typical June.
- Record high
- 102°39° (1953)
- Record low
- 30°−1° (1945)
- Heating degree days
- 52
- Cooling degree days
- 136
Ashton in July
Highs average 82°28° and lows 60°16°, with 3.3 in84 mm of precipitation in a typical July.
- Record high
- 108°42° (1936)
- Record low
- 37°3° (1895)
- Heating degree days
- 15
- Cooling degree days
- 207
Ashton in August
Highs average 80°27° and lows 58°14°, with 3.6 in91 mm of precipitation in a typical August.
- Record high
- 106°41° (1936)
- Record low
- 30°−1° (1950)
- Heating degree days
- 27
- Cooling degree days
- 148
Ashton in September
Highs average 74°23° and lows 49°10°, with 3.3 in83 mm of precipitation in a typical September.
- Record high
- 102°39° (1913)
- Record low
- 15°−9° (1899)
- Heating degree days
- 166
- Cooling degree days
- 59
Ashton in OctoberThis month
Highs average 60°15° and lows 36°2°, with 2.3 in59 mm of precipitation and 1.1 in2.8 cm of snow in a typical October.
- Record high
- 93°34° (1958)
- Record low
- 3°−16° (1917)
- Heating degree days
- 540
- Cooling degree days
- 6
Ashton in November
Highs average 43°6° and lows 22°−5°, with 1.4 in35 mm of precipitation and 5 in13 cm of snow in a typical November.
- Record high
- 77°25° (1978)
- Record low
- −20°−29° (1959)
- Heating degree days
- 976
- Cooling degree days
- 0
Ashton in December
Highs average 28°−2° and lows 11°−12°, with 1.1 in27 mm of precipitation and 9 in23 cm of snow in a typical December.
- Record high
- 66°19° (1939)
- Record low
- −32°−36° (1917)
- Heating degree days
- 1410
- Cooling degree days
- 0