Folsom weather by month
What a typical year looks like in Folsom, New Jersey: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Indian Mills 2 W, 23 km from Folsom; records cover 1901–2026.
The year at a glance
- Precipitation a year
- 50.3 in1279 mm
- Snow a year
- 24 in60 cm
- Last spring freeze
- Apr 30
- First fall freeze
- Oct 14
- Heating degree days
- 4,941
- Cooling degree days
- 990
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 7°−14° (heating, 99%) and 96°36° (cooling, 1%).
Month by month
Folsom in January
Highs average 42°6° and lows 24°−5°, with 3.7 in93 mm of precipitation and 6 in15 cm of snow in a typical January.
- Record high
- 75°24° (1932)
- Record low
- −18°−28° (1984)
- Heating degree days
- 1000
- Cooling degree days
- 0
Folsom in February
Highs average 45°7° and lows 24°−4°, with 3 in76 mm of precipitation and 9 in23 cm of snow in a typical February.
- Record high
- 79°26° (1930)
- Record low
- −25°−32° (1934)
- Heating degree days
- 848
- Cooling degree days
- 0
Folsom in March
Highs average 53°12° and lows 31°−1°, with 4.5 in114 mm of precipitation and 4 in10 cm of snow in a typical March.
- Record high
- 90°32° (1945)
- Record low
- −3°−19° (1984)
- Heating degree days
- 717
- Cooling degree days
- 1
Folsom in April
Highs average 65°18° and lows 40°5°, with 3.7 in93 mm of precipitation and 0.5 in1.3 cm of snow in a typical April.
- Record high
- 97°36° (2002)
- Record low
- 12°−11° (1923)
- Heating degree days
- 382
- Cooling degree days
- 13
Folsom in May
Highs average 74°24° and lows 50°10°, with 3.8 in96 mm of precipitation in a typical May.
- Record high
- 99°37° (1925)
- Record low
- 23°−5° (1966)
- Heating degree days
- 150
- Cooling degree days
- 60
Folsom in June
Highs average 82°28° and lows 59°15°, with 4.4 in110 mm of precipitation in a typical June.
- Record high
- 102°39° (1923)
- Record low
- 34°1° (1945)
- Heating degree days
- 23
- Cooling degree days
- 186
Folsom in July
Highs average 87°30° and lows 64°18°, with 5.2 in133 mm of precipitation in a typical July.
- Record high
- 107°42° (1901)
- Record low
- 40°4° (1988)
- Heating degree days
- 0
- Cooling degree days
- 328
Folsom in August
Highs average 85°29° and lows 62°17°, with 5.3 in136 mm of precipitation in a typical August.
- Record high
- 105°41° (1918)
- Record low
- 36°2° (1976)
- Heating degree days
- 3
- Cooling degree days
- 269
Folsom in September
Highs average 78°26° and lows 55°13°, with 4.4 in113 mm of precipitation in a typical September.
- Record high
- 100°38° (1953)
- Record low
- 27°−3° (1951)
- Heating degree days
- 60
- Cooling degree days
- 116
Folsom in OctoberThis month
Highs average 67°20° and lows 44°7°, with 4.4 in110 mm of precipitation in a typical October.
- Record high
- 95°35° (1941)
- Record low
- 17°−8° (1969)
- Heating degree days
- 304
- Cooling degree days
- 16
Folsom in November
Highs average 56°13° and lows 34°1°, with 3.5 in88 mm of precipitation and 0.3 in0.8 cm of snow in a typical November.
- Record high
- 86°30° (1950)
- Record low
- 0°−18° (1938)
- Heating degree days
- 592
- Cooling degree days
- 1
Folsom in December
Highs average 47°8° and lows 28°−2°, with 4.6 in116 mm of precipitation and 4 in10 cm of snow in a typical December.
- Record high
- 76°24° (1982)
- Record low
- −10°−23° (1917)
- Heating degree days
- 862
- Cooling degree days
- 0