Mars weather by month
What a typical year looks like in Mars, Pennsylvania: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at ACMETONIA LOCK 3, 25 km from Mars; records cover 1978–2026.
The year at a glance
- Precipitation a year
- 44.5 in1131 mm
- Snow a year
- Rare
- Last spring freeze
- Apr 25
- First fall freeze
- Oct 20
- Heating degree days
- 5,811
- Cooling degree days
- 708
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 2°−17° (heating, 99%) and 93°34° (cooling, 1%).
Month by month
Mars in January
Highs average 36°2° and lows 19°−7°, with 3.4 in86 mm of precipitation in a typical January.
- Record high
- 67°19° (2013)
- Record low
- −14°−26° (2026)
- Heating degree days
- 1159
- Cooling degree days
- 0
Mars in February
Highs average 40°4° and lows 21°−6°, with 2.9 in73 mm of precipitation in a typical February.
- Record high
- 75°24° (2018)
- Record low
- −14°−26° (2026)
- Heating degree days
- 973
- Cooling degree days
- 0
Mars in March
Highs average 49°9° and lows 28°−2°, with 3.7 in93 mm of precipitation in a typical March.
- Record high
- 80°27° (2026)
- Record low
- 0°−18° (2015)
- Heating degree days
- 836
- Cooling degree days
- 0
Mars in April
Highs average 62°17° and lows 38°3°, with 3.7 in94 mm of precipitation in a typical April.
- Record high
- 87°31° (2021)
- Record low
- 20°−7° (2013)
- Heating degree days
- 457
- Cooling degree days
- 2
Mars in May
Highs average 72°22° and lows 49°9°, with 3.9 in99 mm of precipitation in a typical May.
- Record high
- 94°34° (2011)
- Record low
- 28°−2° (2022)
- Heating degree days
- 191
- Cooling degree days
- 40
Mars in June
Highs average 79°26° and lows 58°14°, with 4.5 in113 mm of precipitation in a typical June.
- Record high
- 102°39° (2022)
- Record low
- 40°4° (2019)
- Heating degree days
- 31
- Cooling degree days
- 131
Mars in July
Highs average 83°28° and lows 62°17°, with 4.5 in115 mm of precipitation in a typical July.
- Record high
- 101°38° (2012)
- Record low
- 48°9° (2026)
- Heating degree days
- 4
- Cooling degree days
- 243
Mars in August
Highs average 82°28° and lows 61°16°, with 3.6 in90 mm of precipitation in a typical August.
- Record high
- 96°36° (2012)
- Record low
- 39°4° (2014)
- Heating degree days
- 11
- Cooling degree days
- 203
Mars in September
Highs average 76°24° and lows 54°12°, with 4.2 in106 mm of precipitation in a typical September.
- Record high
- 95°35° (2018)
- Record low
- 39°4° (2010)
- Heating degree days
- 92
- Cooling degree days
- 80
Mars in OctoberThis month
Highs average 64°18° and lows 43°6°, with 3.3 in84 mm of precipitation in a typical October.
- Record high
- 89°32° (2019)
- Record low
- 30°−1° (2008)
- Heating degree days
- 379
- Cooling degree days
- 9
Mars in November
Highs average 51°11° and lows 32°0°, with 3.3 in83 mm of precipitation in a typical November.
- Record high
- 80°27° (2024)
- Record low
- 11°−12° (2019)
- Heating degree days
- 703
- Cooling degree days
- 0
Mars in December
Highs average 42°5° and lows 26°−4°, with 3.7 in93 mm of precipitation in a typical December.
- Record high
- 67°19° (2012)
- Record low
- −5°−21° (2022)
- Heating degree days
- 975
- Cooling degree days
- 0