Hartland weather by month
What a typical year looks like in Hartland, California: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Ash Mountain, 22 km from Hartland; records cover 1927–2026.
The year at a glance
- Precipitation a year
- 25 in635 mm
- Snow a year
- 0.2 in0.5 cm
- Last spring freeze
- Mar 17
- First fall freeze
- Nov 28
- Heating degree days
- 2,606
- Cooling degree days
- 2,082
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 28°−2° (heating, 99%) and 107°42° (cooling, 1%).
Month by month
Hartland in January
Highs average 58°14° and lows 38°3°, with 4.9 in124 mm of precipitation and 0.1 in0.3 cm of snow in a typical January.
- Record high
- 84°29° (1976)
- Record low
- 18°−8° (1932)
- Heating degree days
- 529
- Cooling degree days
- 0
Hartland in February
Highs average 60°16° and lows 41°5°, with 4.3 in109 mm of precipitation in a typical February.
- Record high
- 85°29° (1977)
- Record low
- 21°−6° (1932)
- Heating degree days
- 408
- Cooling degree days
- 0
Hartland in March
Highs average 64°18° and lows 43°6°, with 4 in102 mm of precipitation and 0.1 in0.3 cm of snow in a typical March.
- Record high
- 90°32° (2026)
- Record low
- 20°−7° (1991)
- Heating degree days
- 359
- Cooling degree days
- 2
Hartland in April
Highs average 69°21° and lows 45°7°, with 2.5 in63 mm of precipitation in a typical April.
- Record high
- 97°36° (2009)
- Record low
- 25°−4° (2018)
- Heating degree days
- 253
- Cooling degree days
- 18
Hartland in May
Highs average 79°26° and lows 54°12°, with 1.2 in31 mm of precipitation in a typical May.
- Record high
- 106°41° (2009)
- Record low
- 33°1° (1933)
- Heating degree days
- 94
- Cooling degree days
- 132
Hartland in June
Highs average 90°32° and lows 62°17°, with 0.37 in9.4 mm of precipitation in a typical June.
- Record high
- 114°46° (1961)
- Record low
- 38°3° (1941)
- Heating degree days
- 13
- Cooling degree days
- 341
Hartland in July
Highs average 97°36° and lows 69°21°, with 0.14 in3.6 mm of precipitation in a typical July.
- Record high
- 118°48° (2007)
- Record low
- 47°8° (2011)
- Heating degree days
- 0
- Cooling degree days
- 560
Hartland in August
Highs average 97°36° and lows 68°20°, with 0.02 in0.5 mm of precipitation in a typical August.
- Record high
- 116°47° (1933)
- Record low
- 45°7° (1945)
- Heating degree days
- 0
- Cooling degree days
- 538
Hartland in September
Highs average 91°33° and lows 63°17°, with 0.18 in4.6 mm of precipitation in a typical September.
- Record high
- 112°44° (1955)
- Record low
- 40°4° (1951)
- Heating degree days
- 6
- Cooling degree days
- 362
Hartland in OctoberThis month
Highs average 79°26° and lows 53°12°, with 1.2 in31 mm of precipitation in a typical October.
- Record high
- 103°39° (1952)
- Record low
- 28°−2° (2008)
- Heating degree days
- 82
- Cooling degree days
- 121
Hartland in November
Highs average 66°19° and lows 44°7°, with 2.4 in61 mm of precipitation in a typical November.
- Record high
- 94°34° (1933)
- Record low
- 20°−7° (2015)
- Heating degree days
- 317
- Cooling degree days
- 8
Hartland in December
Highs average 57°14° and lows 38°3°, with 3.7 in94 mm of precipitation in a typical December.
- Record high
- 82°28° (1958)
- Record low
- 17°−8° (1990)
- Heating degree days
- 545
- Cooling degree days
- 0