Hilmar-Irwin weather by month
What a typical year looks like in Hilmar-Irwin, California: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at TURLOCK #2, 11 km from Hilmar-Irwin; records cover 1894–2026.
The year at a glance
- Precipitation a year
- 12.4 in315 mm
- Snow a year
- Rare
- Last spring freeze
- Jan 24
- First fall freeze
- Dec 6
- Heating degree days
- 2,089
- Cooling degree days
- 1,749
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 31°−1° (heating, 99%) and 102°39° (cooling, 1%).
Month by month
Hilmar-Irwin in January
Highs average 55°13° and lows 42°6°, with 2.6 in67 mm of precipitation in a typical January.
- Record high
- 75°24° (1898)
- Record low
- 18°−8° (1922)
- Heating degree days
- 510
- Cooling degree days
- 0
Hilmar-Irwin in February
Highs average 61°16° and lows 45°7°, with 2.3 in58 mm of precipitation in a typical February.
- Record high
- 80°27° (2026)
- Record low
- 21°−6° (1923)
- Heating degree days
- 329
- Cooling degree days
- 0
Hilmar-Irwin in March
Highs average 67°19° and lows 49°9°, with 1.9 in47 mm of precipitation in a typical March.
- Record high
- 89°32° (2026)
- Record low
- 25°−4° (1894)
- Heating degree days
- 232
- Cooling degree days
- 6
Hilmar-Irwin in April
Highs average 72°22° and lows 52°11°, with 0.93 in24 mm of precipitation in a typical April.
- Record high
- 96°36° (2004)
- Record low
- 28°−2° (1896)
- Heating degree days
- 126
- Cooling degree days
- 38
Hilmar-Irwin in May
Highs average 80°27° and lows 57°14°, with 0.59 in15 mm of precipitation in a typical May.
- Record high
- 103°39° (2001)
- Record low
- 34°1° (1896)
- Heating degree days
- 35
- Cooling degree days
- 150
Hilmar-Irwin in June
Highs average 88°31° and lows 62°17°, with 0.12 in3 mm of precipitation in a typical June.
- Record high
- 111°44° (1895)
- Record low
- 40°4° (1896)
- Heating degree days
- 3
- Cooling degree days
- 306
Hilmar-Irwin in July
Highs average 93°34° and lows 66°19°, with 0 in0 mm of precipitation in a typical July.
- Record high
- 114°46° (1896)
- Record low
- 43°6° (1895)
- Heating degree days
- 0
- Cooling degree days
- 446
Hilmar-Irwin in August
Highs average 92°33° and lows 65°18°, with 0.01 in0.3 mm of precipitation in a typical August.
- Record high
- 113°45° (1897)
- Record low
- 41°5° (1894)
- Heating degree days
- 0
- Cooling degree days
- 412
Hilmar-Irwin in September
Highs average 88°31° and lows 62°17°, with 0.03 in0.8 mm of precipitation in a typical September.
- Record high
- 108°42° (2022)
- Record low
- 37°3° (1895)
- Heating degree days
- 2
- Cooling degree days
- 296
Hilmar-Irwin in OctoberThis month
Highs average 77°25° and lows 55°13°, with 0.61 in15 mm of precipitation in a typical October.
- Record high
- 101°38° (2024)
- Record low
- 32°0° (1895)
- Heating degree days
- 53
- Cooling degree days
- 93
Hilmar-Irwin in November
Highs average 64°18° and lows 47°8°, with 1.1 in27 mm of precipitation in a typical November.
- Record high
- 85°29° (1917)
- Record low
- 21°−6° (1895)
- Heating degree days
- 286
- Cooling degree days
- 2
Hilmar-Irwin in December
Highs average 55°13° and lows 42°5°, with 2.3 in57 mm of precipitation in a typical December.
- Record high
- 73°23° (2021)
- Record low
- 18°−8° (1924)
- Heating degree days
- 513
- Cooling degree days
- 0