Morristown weather by month
What a typical year looks like in Morristown, New Jersey: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Boonton 1 SE, 13 km from Morristown; records cover 1892–2026.
The year at a glance
- Precipitation a year
- 49.2 in1249 mm
- Snow a year
- Rare
- Last spring freeze
- Apr 15
- First fall freeze
- Oct 20
- Heating degree days
- 5,631
- Cooling degree days
- 865
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 5°−15° (heating, 99%) and 94°34° (cooling, 1%).
Month by month
Morristown in January
Highs average 38°3° and lows 21°−6°, with 3.7 in95 mm of precipitation in a typical January.
- Record high
- 71°22° (1932)
- Record low
- −15°−26° (1961)
- Heating degree days
- 1113
- Cooling degree days
- 0
Morristown in February
Highs average 40°4° and lows 22°−6°, with 2.8 in71 mm of precipitation in a typical February.
- Record high
- 75°24° (2018)
- Record low
- −20°−29° (1934)
- Heating degree days
- 955
- Cooling degree days
- 0
Morristown in March
Highs average 48°9° and lows 29°−2°, with 4.2 in106 mm of precipitation in a typical March.
- Record high
- 83°28° (1945)
- Record low
- −3°−19° (1934)
- Heating degree days
- 820
- Cooling degree days
- 0
Morristown in April
Highs average 61°16° and lows 39°4°, with 3.6 in92 mm of precipitation in a typical April.
- Record high
- 93°34° (1915)
- Record low
- 8°−13° (1923)
- Heating degree days
- 451
- Cooling degree days
- 4
Morristown in May
Highs average 71°22° and lows 49°10°, with 4 in100 mm of precipitation in a typical May.
- Record high
- 98°37° (1900)
- Record low
- 26°−3° (1923)
- Heating degree days
- 191
- Cooling degree days
- 41
Morristown in June
Highs average 81°27° and lows 59°15°, with 4.9 in125 mm of precipitation in a typical June.
- Record high
- 99°37° (1925)
- Record low
- 32°0° (1918)
- Heating degree days
- 26
- Cooling degree days
- 168
Morristown in July
Highs average 85°30° and lows 64°18°, with 4.7 in119 mm of precipitation in a typical July.
- Record high
- 102°39° (1936)
- Record low
- 42°6° (1927)
- Heating degree days
- 1
- Cooling degree days
- 302
Morristown in August
Highs average 84°29° and lows 62°17°, with 3.7 in93 mm of precipitation in a typical August.
- Record high
- 103°39° (1918)
- Record low
- 36°2° (1965)
- Heating degree days
- 4
- Cooling degree days
- 247
Morristown in September
Highs average 77°25° and lows 54°12°, with 4.7 in119 mm of precipitation in a typical September.
- Record high
- 104°40° (1953)
- Record low
- 29°−2° (1925)
- Heating degree days
- 83
- Cooling degree days
- 96
Morristown in OctoberThis month
Highs average 64°18° and lows 42°6°, with 4.5 in115 mm of precipitation in a typical October.
- Record high
- 90°32° (2019)
- Record low
- 16°−9° (1936)
- Heating degree days
- 371
- Cooling degree days
- 7
Morristown in November
Highs average 53°11° and lows 33°1°, with 4.1 in103 mm of precipitation in a typical November.
- Record high
- 80°27° (1931)
- Record low
- 6°−14° (1938)
- Heating degree days
- 664
- Cooling degree days
- 0
Morristown in December
Highs average 42°6° and lows 26°−3°, with 4.4 in111 mm of precipitation in a typical December.
- Record high
- 77°25° (1933)
- Record low
- −21°−29° (1917)
- Heating degree days
- 952
- Cooling degree days
- 0