Rumson weather by month
What a typical year looks like in Rumson, New Jersey: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at FREEHOLD-MARLBORO, 22 km from Rumson; records cover 1881–2026.
The year at a glance
- Precipitation a year
- 48.6 in1234 mm
- Snow a year
- Rare
- Last spring freeze
- Apr 17
- First fall freeze
- Oct 20
- Heating degree days
- 4,988
- Cooling degree days
- 1,018
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 8°−13° (heating, 99%) and 95°35° (cooling, 1%).
Month by month
Rumson in January
Highs average 42°5° and lows 23°−5°, with 3.9 in98 mm of precipitation in a typical January.
- Record high
- 73°23° (1950)
- Record low
- −14°−26° (1935)
- Heating degree days
- 1014
- Cooling degree days
- 0
Rumson in February
Highs average 44°7° and lows 25°−4°, with 3.1 in79 mm of precipitation in a typical February.
- Record high
- 79°26° (2018)
- Record low
- −20°−29° (1934)
- Heating degree days
- 848
- Cooling degree days
- 0
Rumson in March
Highs average 51°11° and lows 31°0°, with 4.2 in107 mm of precipitation in a typical March.
- Record high
- 88°31° (1998)
- Record low
- −2°−19° (1967)
- Heating degree days
- 733
- Cooling degree days
- 0
Rumson in April
Highs average 63°17° and lows 41°5°, with 3.8 in97 mm of precipitation in a typical April.
- Record high
- 95°35° (2002)
- Record low
- 17°−8° (1982)
- Heating degree days
- 401
- Cooling degree days
- 14
Rumson in May
Highs average 72°22° and lows 51°10°, with 3.8 in97 mm of precipitation in a typical May.
- Record high
- 96°36° (1941)
- Record low
- 28°−2° (2016)
- Heating degree days
- 167
- Cooling degree days
- 52
Rumson in June
Highs average 81°27° and lows 60°16°, with 4.4 in113 mm of precipitation in a typical June.
- Record high
- 100°38° (1934)
- Record low
- 35°2° (1938)
- Heating degree days
- 26
- Cooling degree days
- 194
Rumson in July
Highs average 87°30° and lows 66°19°, with 4.7 in118 mm of precipitation in a typical July.
- Record high
- 106°41° (1936)
- Record low
- 42°6° (1893)
- Heating degree days
- 1
- Cooling degree days
- 342
Rumson in August
Highs average 85°29° and lows 63°17°, with 4.1 in105 mm of precipitation in a typical August.
- Record high
- 102°39° (1955)
- Record low
- 41°5° (1976)
- Heating degree days
- 3
- Cooling degree days
- 282
Rumson in September
Highs average 78°26° and lows 56°13°, with 4.2 in106 mm of precipitation in a typical September.
- Record high
- 99°37° (1953)
- Record low
- 32°0° (1947)
- Heating degree days
- 56
- Cooling degree days
- 119
Rumson in OctoberThis month
Highs average 67°19° and lows 44°7°, with 4.1 in105 mm of precipitation in a typical October.
- Record high
- 95°35° (2019)
- Record low
- 20°−7° (1969)
- Heating degree days
- 310
- Cooling degree days
- 15
Rumson in November
Highs average 56°13° and lows 36°2°, with 3.5 in90 mm of precipitation in a typical November.
- Record high
- 83°28° (1950)
- Record low
- 7°−14° (1891)
- Heating degree days
- 572
- Cooling degree days
- 0
Rumson in December
Highs average 47°8° and lows 28°−2°, with 4.7 in119 mm of precipitation in a typical December.
- Record high
- 76°24° (1998)
- Record low
- −5°−21° (1933)
- Heating degree days
- 857
- Cooling degree days
- 0