Mercerville weather by month
What a typical year looks like in Mercerville, New Jersey: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Trenton-Mercer Airport, 11 km from Mercerville; records cover 1865–2026.
The year at a glance
- Precipitation a year
- 45.6 in1159 mm
- Snow a year
- 27 in68 cm
- Last spring freeze
- Apr 12
- First fall freeze
- Oct 24
- Heating degree days
- 4,976
- Cooling degree days
- 1,050
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 9°−13° (heating, 99%) and 96°36° (cooling, 1%).
Month by month
Mercerville in January
Highs average 40°4° and lows 24°−4°, with 3.3 in84 mm of precipitation and 8 in21 cm of snow in a typical January.
- Record high
- 73°23° (1932)
- Record low
- −16°−27° (1984)
- Heating degree days
- 1023
- Cooling degree days
- 0
Mercerville in February
Highs average 43°6° and lows 26°−3°, with 2.7 in67 mm of precipitation and 9 in22 cm of snow in a typical February.
- Record high
- 78°26° (2018)
- Record low
- −14°−26° (1934)
- Heating degree days
- 858
- Cooling degree days
- 0
Mercerville in March
Highs average 51°10° and lows 33°0°, with 4 in102 mm of precipitation and 4 in10 cm of snow in a typical March.
- Record high
- 87°31° (1998)
- Record low
- 0°−18° (1984)
- Heating degree days
- 722
- Cooling degree days
- 1
Mercerville in April
Highs average 63°17° and lows 42°6°, with 3.6 in92 mm of precipitation and 0.5 in1.3 cm of snow in a typical April.
- Record high
- 93°34° (1915)
- Record low
- 11°−12° (1923)
- Heating degree days
- 387
- Cooling degree days
- 12
Mercerville in May
Highs average 72°22° and lows 52°11°, with 4 in101 mm of precipitation in a typical May.
- Record high
- 99°37° (1911)
- Record low
- 31°−1° (1985)
- Heating degree days
- 148
- Cooling degree days
- 55
Mercerville in June
Highs average 81°27° and lows 61°16°, with 4.4 in110 mm of precipitation in a typical June.
- Record high
- 100°38° (1934)
- Record low
- 39°4° (1986)
- Heating degree days
- 20
- Cooling degree days
- 199
Mercerville in July
Highs average 86°30° and lows 67°19°, with 4.4 in112 mm of precipitation in a typical July.
- Record high
- 106°41° (1936)
- Record low
- 46°8° (1988)
- Heating degree days
- 0
- Cooling degree days
- 350
Mercerville in August
Highs average 84°29° and lows 65°18°, with 4.2 in107 mm of precipitation in a typical August.
- Record high
- 105°41° (1918)
- Record low
- 39°4° (1986)
- Heating degree days
- 2
- Cooling degree days
- 294
Mercerville in September
Highs average 77°25° and lows 58°14°, with 4.1 in103 mm of precipitation in a typical September.
- Record high
- 101°38° (1983)
- Record low
- 34°1° (1997)
- Heating degree days
- 51
- Cooling degree days
- 123
Mercerville in OctoberThis month
Highs average 66°19° and lows 46°8°, with 3.8 in96 mm of precipitation and 0.1 in0.3 cm of snow in a typical October.
- Record high
- 94°34° (1941)
- Record low
- 21°−6° (1985)
- Heating degree days
- 304
- Cooling degree days
- 16
Mercerville in November
Highs average 55°13° and lows 36°2°, with 3.2 in81 mm of precipitation and 0.5 in1.3 cm of snow in a typical November.
- Record high
- 83°28° (1950)
- Record low
- 9°−13° (1875)
- Heating degree days
- 588
- Cooling degree days
- 0
Mercerville in December
Highs average 44°7° and lows 29°−1°, with 4 in103 mm of precipitation and 5 in12 cm of snow in a typical December.
- Record high
- 76°24° (1998)
- Record low
- −8°−22° (1880)
- Heating degree days
- 873
- Cooling degree days
- 0