Casa de Oro-Mount Helix weather by month
What a typical year looks like in Casa de Oro-Mount Helix, California: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at San Diego International Airport, 20 km from Casa de Oro-Mount Helix; records cover 1874–2026.
The year at a glance
- Precipitation a year
- 9.8 in249 mm
- Snow a year
- Rare
- Last spring freeze
- Rare
- First fall freeze
- Rare
- Heating degree days
- 990
- Cooling degree days
- 894
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 43°6° (heating, 99%) and 89°32° (cooling, 1%).
Month by month
Casa de Oro-Mount Helix in January
Highs average 66°19° and lows 50°10°, with 2 in50 mm of precipitation in a typical January.
- Record high
- 88°31° (1953)
- Record low
- 25°−4° (1913)
- Heating degree days
- 209
- Cooling degree days
- 3
Casa de Oro-Mount Helix in February
Highs average 66°19° and lows 52°11°, with 2.2 in56 mm of precipitation in a typical February.
- Record high
- 91°33° (2022)
- Record low
- 34°1° (1891)
- Heating degree days
- 173
- Cooling degree days
- 5
Casa de Oro-Mount Helix in March
Highs average 67°19° and lows 55°13°, with 1.5 in37 mm of precipitation in a typical March.
- Record high
- 99°37° (1879)
- Record low
- 36°2° (1894)
- Heating degree days
- 142
- Cooling degree days
- 10
Casa de Oro-Mount Helix in April
Highs average 69°20° and lows 57°14°, with 0.65 in17 mm of precipitation in a typical April.
- Record high
- 98°37° (1989)
- Record low
- 39°4° (1875)
- Heating degree days
- 85
- Cooling degree days
- 23
Casa de Oro-Mount Helix in May
Highs average 70°21° and lows 60°16°, with 0.28 in7.1 mm of precipitation in a typical May.
- Record high
- 98°37° (1896)
- Record low
- 45°7° (1883)
- Heating degree days
- 45
- Cooling degree days
- 37
Casa de Oro-Mount Helix in June
Highs average 72°22° and lows 63°17°, with 0.05 in1.3 mm of precipitation in a typical June.
- Record high
- 101°38° (1979)
- Record low
- 50°10° (1884)
- Heating degree days
- 10
- Cooling degree days
- 75
Casa de Oro-Mount Helix in July
Highs average 75°24° and lows 66°19°, with 0.08 in2 mm of precipitation in a typical July.
- Record high
- 100°38° (1930)
- Record low
- 54°12° (1880)
- Heating degree days
- 1
- Cooling degree days
- 177
Casa de Oro-Mount Helix in August
Highs average 77°25° and lows 68°20°, with 0.01 in0.3 mm of precipitation in a typical August.
- Record high
- 98°37° (1955)
- Record low
- 54°12° (1879)
- Heating degree days
- 0
- Cooling degree days
- 230
Casa de Oro-Mount Helix in September
Highs average 77°25° and lows 66°19°, with 0.12 in3 mm of precipitation in a typical September.
- Record high
- 111°44° (1963)
- Record low
- 50°10° (1880)
- Heating degree days
- 0
- Cooling degree days
- 201
Casa de Oro-Mount Helix in OctoberThis month
Highs average 75°24° and lows 62°16°, with 0.5 in13 mm of precipitation in a typical October.
- Record high
- 107°42° (1961)
- Record low
- 43°6° (1971)
- Heating degree days
- 11
- Cooling degree days
- 106
Casa de Oro-Mount Helix in November
Highs average 71°22° and lows 55°13°, with 0.79 in20 mm of precipitation in a typical November.
- Record high
- 100°38° (2010)
- Record low
- 36°2° (1919)
- Heating degree days
- 93
- Cooling degree days
- 26
Casa de Oro-Mount Helix in December
Highs average 66°19° and lows 50°10°, with 1.7 in42 mm of precipitation in a typical December.
- Record high
- 88°31° (1963)
- Record low
- 32°0° (1879)
- Heating degree days
- 221
- Cooling degree days
- 1