Harbison Canyon weather by month
What a typical year looks like in Harbison Canyon, California: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at El Cajon, 9 km from Harbison Canyon; records cover 1899–2026.
The year at a glance
- Precipitation a year
- 11.6 in295 mm
- Snow a year
- Rare
- Last spring freeze
- Jan 15
- First fall freeze
- Dec 18
- Heating degree days
- 1,309
- Cooling degree days
- 1,378
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 33°1° (heating, 99%) and 101°38° (cooling, 1%).
Month by month
Harbison Canyon in January
Highs average 69°21° and lows 43°6°, with 2.3 in59 mm of precipitation in a typical January.
- Record high
- 93°34° (1923)
- Record low
- 19°−7° (1913)
- Heating degree days
- 283
- Cooling degree days
- 1
Harbison Canyon in February
Highs average 69°21° and lows 44°7°, with 2.6 in66 mm of precipitation in a typical February.
- Record high
- 96°36° (1963)
- Record low
- 21°−6° (1903)
- Heating degree days
- 232
- Cooling degree days
- 2
Harbison Canyon in March
Highs average 71°22° and lows 48°9°, with 1.9 in49 mm of precipitation in a typical March.
- Record high
- 101°38° (2026)
- Record low
- 26°−3° (1948)
- Heating degree days
- 176
- Cooling degree days
- 10
Harbison Canyon in April
Highs average 75°24° and lows 51°10°, with 0.75 in19 mm of precipitation in a typical April.
- Record high
- 105°41° (1940)
- Record low
- 29°−2° (1945)
- Heating degree days
- 100
- Cooling degree days
- 28
Harbison Canyon in May
Highs average 76°25° and lows 56°13°, with 0.3 in7.6 mm of precipitation in a typical May.
- Record high
- 106°41° (1909)
- Record low
- 34°1° (1908)
- Heating degree days
- 42
- Cooling degree days
- 75
Harbison Canyon in June
Highs average 81°27° and lows 59°15°, with 0.06 in1.5 mm of precipitation in a typical June.
- Record high
- 113°45° (1917)
- Record low
- 40°4° (1933)
- Heating degree days
- 4
- Cooling degree days
- 157
Harbison Canyon in July
Highs average 86°30° and lows 63°17°, with 0.16 in4.1 mm of precipitation in a typical July.
- Record high
- 113°45° (2006)
- Record low
- 44°7° (1932)
- Heating degree days
- 0
- Cooling degree days
- 301
Harbison Canyon in August
Highs average 89°31° and lows 65°18°, with 0.02 in0.5 mm of precipitation in a typical August.
- Record high
- 111°44° (1955)
- Record low
- 44°7° (1928)
- Heating degree days
- 0
- Cooling degree days
- 361
Harbison Canyon in September
Highs average 87°31° and lows 62°17°, with 0.11 in2.8 mm of precipitation in a typical September.
- Record high
- 114°46° (2020)
- Record low
- 37°3° (1900)
- Heating degree days
- 1
- Cooling degree days
- 292
Harbison Canyon in OctoberThis month
Highs average 81°27° and lows 56°13°, with 0.54 in14 mm of precipitation in a typical October.
- Record high
- 107°42° (1906)
- Record low
- 30°−1° (1971)
- Heating degree days
- 25
- Cooling degree days
- 127
Harbison Canyon in November
Highs average 75°24° and lows 47°8°, with 1 in26 mm of precipitation in a typical November.
- Record high
- 99°37° (2008)
- Record low
- 25°−4° (1906)
- Heating degree days
- 139
- Cooling degree days
- 23
Harbison Canyon in December
Highs average 69°20° and lows 42°5°, with 1.8 in46 mm of precipitation in a typical December.
- Record high
- 95°35° (1917)
- Record low
- 21°−6° (1954)
- Heating degree days
- 307
- Cooling degree days
- 1