Williams weather by month
What a typical year looks like in Williams, Iowa: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Webster City, 21 km from Williams; records cover 1893–2026.
The year at a glance
- Precipitation a year
- 37.2 in946 mm
- Snow a year
- 33 in84 cm
- Last spring freeze
- May 5
- First fall freeze
- Sep 29
- Heating degree days
- 7,456
- Cooling degree days
- 619
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −14°−26° (heating, 99%) and 93°34° (cooling, 1%).
Month by month
Williams in January
Highs average 26°−3° and lows 7°−14°, with 0.87 in22 mm of precipitation and 8 in20 cm of snow in a typical January.
- Record high
- 72°22° (2002)
- Record low
- −33°−36° (1930)
- Heating degree days
- 1502
- Cooling degree days
- 0
Williams in February
Highs average 31°−1° and lows 11°−12°, with 1.3 in34 mm of precipitation and 10 in25 cm of snow in a typical February.
- Record high
- 76°24° (2024)
- Record low
- −34°−37° (1930)
- Heating degree days
- 1236
- Cooling degree days
- 0
Williams in March
Highs average 44°7° and lows 23°−5°, with 2.1 in52 mm of precipitation and 4 in11 cm of snow in a typical March.
- Record high
- 89°32° (1986)
- Record low
- −29°−34° (1962)
- Heating degree days
- 970
- Cooling degree days
- 0
Williams in April
Highs average 59°15° and lows 34°1°, with 3.7 in94 mm of precipitation and 1 in2.5 cm of snow in a typical April.
- Record high
- 97°36° (1910)
- Record low
- 4°−16° (1982)
- Heating degree days
- 561
- Cooling degree days
- 3
Williams in May
Highs average 70°21° and lows 47°8°, with 5.3 in134 mm of precipitation and 0.2 in0.5 cm of snow in a typical May.
- Record high
- 107°42° (1934)
- Record low
- 17°−8° (1907)
- Heating degree days
- 241
- Cooling degree days
- 35
Williams in June
Highs average 80°26° and lows 57°14°, with 5.8 in146 mm of precipitation in a typical June.
- Record high
- 107°42° (1934)
- Record low
- 33°1° (1946)
- Heating degree days
- 39
- Cooling degree days
- 140
Williams in July
Highs average 83°28° and lows 61°16°, with 4.4 in112 mm of precipitation in a typical July.
- Record high
- 109°43° (1936)
- Record low
- 39°4° (1911)
- Heating degree days
- 9
- Cooling degree days
- 220
Williams in August
Highs average 81°27° and lows 58°14°, with 4.8 in121 mm of precipitation in a typical August.
- Record high
- 109°43° (1936)
- Record low
- 34°1° (1915)
- Heating degree days
- 24
- Cooling degree days
- 156
Williams in September
Highs average 75°24° and lows 49°9°, with 3.4 in85 mm of precipitation in a typical September.
- Record high
- 103°39° (1913)
- Record low
- 20°−7° (1942)
- Heating degree days
- 153
- Cooling degree days
- 59
Williams in OctoberThis month
Highs average 62°17° and lows 37°3°, with 2.7 in67 mm of precipitation and 0.1 in0.3 cm of snow in a typical October.
- Record high
- 96°36° (1963)
- Record low
- −8°−22° (1925)
- Heating degree days
- 496
- Cooling degree days
- 6
Williams in November
Highs average 45°7° and lows 24°−4°, with 1.7 in43 mm of precipitation and 1.4 in3.6 cm of snow in a typical November.
- Record high
- 81°27° (1931)
- Record low
- −16°−27° (1977)
- Heating degree days
- 908
- Cooling degree days
- 0
Williams in December
Highs average 32°0° and lows 13°−10°, with 1.4 in35 mm of precipitation and 8 in21 cm of snow in a typical December.
- Record high
- 69°21° (2021)
- Record low
- −28°−33° (1914)
- Heating degree days
- 1317
- Cooling degree days
- 0