Williams weather by month
What a typical year looks like in Williams, California: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Colusa 2 Ssw, 11 km from Williams; records cover 1948–2025.
The year at a glance
- Precipitation a year
- 17.2 in437 mm
- Snow a year
- Rare
- Last spring freeze
- Feb 9
- First fall freeze
- Nov 27
- Heating degree days
- 2,586
- Cooling degree days
- 1,330
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 29°−2° (heating, 99%) and 104°40° (cooling, 1%).
Month by month
Williams in January
Highs average 55°13° and lows 38°3°, with 3.6 in91 mm of precipitation in a typical January.
- Record high
- 78°26° (1962)
- Record low
- 18°−8° (2025)
- Heating degree days
- 577
- Cooling degree days
- 0
Williams in February
Highs average 60°16° and lows 41°5°, with 3 in75 mm of precipitation in a typical February.
- Record high
- 81°27° (2022)
- Record low
- 20°−7° (2020)
- Heating degree days
- 402
- Cooling degree days
- 0
Williams in March
Highs average 67°19° and lows 44°7°, with 2.2 in56 mm of precipitation in a typical March.
- Record high
- 92°33° (2026)
- Record low
- 25°−4° (1966)
- Heating degree days
- 307
- Cooling degree days
- 2
Williams in April
Highs average 73°23° and lows 46°8°, with 1 in25 mm of precipitation in a typical April.
- Record high
- 98°37° (2009)
- Record low
- 24°−4° (2024)
- Heating degree days
- 179
- Cooling degree days
- 22
Williams in May
Highs average 81°27° and lows 53°12°, with 0.84 in21 mm of precipitation in a typical May.
- Record high
- 106°41° (1950)
- Record low
- 31°−1° (2020)
- Heating degree days
- 56
- Cooling degree days
- 126
Williams in June
Highs average 88°31° and lows 59°15°, with 0.51 in13 mm of precipitation in a typical June.
- Record high
- 112°44° (1961)
- Record low
- 34°1° (2023)
- Heating degree days
- 7
- Cooling degree days
- 261
Williams in July
Highs average 92°34° and lows 60°16°, with 0.01 in0.3 mm of precipitation in a typical July.
- Record high
- 112°44° (1972)
- Record low
- 35°2° (2007)
- Heating degree days
- 0
- Cooling degree days
- 346
Williams in August
Highs average 92°33° and lows 58°15°, with 0.03 in0.8 mm of precipitation in a typical August.
- Record high
- 113°45° (1978)
- Record low
- 42°6° (2020)
- Heating degree days
- 0
- Cooling degree days
- 307
Williams in September
Highs average 89°32° and lows 54°12°, with 0.11 in2.8 mm of precipitation in a typical September.
- Record high
- 114°46° (2022)
- Record low
- 34°1° (2021)
- Heating degree days
- 9
- Cooling degree days
- 212
Williams in OctoberThis month
Highs average 79°26° and lows 48°9°, with 0.87 in22 mm of precipitation in a typical October.
- Record high
- 105°41° (2001)
- Record low
- 20°−7° (2021)
- Heating degree days
- 101
- Cooling degree days
- 53
Williams in November
Highs average 64°18° and lows 42°5°, with 1.9 in49 mm of precipitation in a typical November.
- Record high
- 88°31° (1955)
- Record low
- 22°−6° (1948)
- Heating degree days
- 362
- Cooling degree days
- 1
Williams in December
Highs average 55°13° and lows 38°3°, with 3.2 in81 mm of precipitation in a typical December.
- Record high
- 76°24° (1967)
- Record low
- 14°−10° (2022)
- Heating degree days
- 586
- Cooling degree days
- 0