Sinnamahoning weather by month
What a typical year looks like in Sinnamahoning, Pennsylvania: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Stevenson Dam, 11 km from Sinnamahoning; records cover 1969–2026.
The year at a glance
- Precipitation a year
- 43.1 in1096 mm
- Snow a year
- 39 in98 cm
- Last spring freeze
- May 7
- First fall freeze
- Oct 15
- Heating degree days
- 6,838
- Cooling degree days
- 410
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −3°−19° (heating, 99%) and 92°33° (cooling, 1%).
Month by month
Sinnamahoning in January
Highs average 33°0° and lows 16°−9°, with 2.8 in71 mm of precipitation and 11 in27 cm of snow in a typical January.
- Record high
- 67°19° (1998)
- Record low
- −22°−30° (1994)
- Heating degree days
- 1268
- Cooling degree days
- 0
Sinnamahoning in February
Highs average 36°2° and lows 16°−9°, with 2.4 in61 mm of precipitation and 11 in27 cm of snow in a typical February.
- Record high
- 72°22° (2017)
- Record low
- −18°−28° (1979)
- Heating degree days
- 1096
- Cooling degree days
- 0
Sinnamahoning in March
Highs average 45°7° and lows 23°−5°, with 3.3 in83 mm of precipitation and 6 in14 cm of snow in a typical March.
- Record high
- 83°28° (1986)
- Record low
- −11°−24° (2015)
- Heating degree days
- 961
- Cooling degree days
- 0
Sinnamahoning in April
Highs average 59°15° and lows 33°0°, with 3.9 in98 mm of precipitation and 1 in2.5 cm of snow in a typical April.
- Record high
- 90°32° (1976)
- Record low
- 13°−11° (1982)
- Heating degree days
- 584
- Cooling degree days
- 1
Sinnamahoning in May
Highs average 70°21° and lows 43°6°, with 3.8 in97 mm of precipitation in a typical May.
- Record high
- 95°35° (1998)
- Record low
- 22°−6° (2020)
- Heating degree days
- 288
- Cooling degree days
- 20
Sinnamahoning in June
Highs average 77°25° and lows 53°12°, with 4.1 in103 mm of precipitation in a typical June.
- Record high
- 95°35° (1988)
- Record low
- 32°0° (2014)
- Heating degree days
- 79
- Cooling degree days
- 74
Sinnamahoning in July
Highs average 81°27° and lows 57°14°, with 4.5 in113 mm of precipitation in a typical July.
- Record high
- 106°41° (2011)
- Record low
- 39°4° (1988)
- Heating degree days
- 17
- Cooling degree days
- 148
Sinnamahoning in August
Highs average 80°27° and lows 56°14°, with 3.9 in98 mm of precipitation in a typical August.
- Record high
- 99°37° (1999)
- Record low
- 39°4° (1982)
- Heating degree days
- 26
- Cooling degree days
- 122
Sinnamahoning in September
Highs average 73°23° and lows 50°10°, with 4.3 in109 mm of precipitation in a typical September.
- Record high
- 96°36° (2002)
- Record low
- 31°−1° (1974)
- Heating degree days
- 147
- Cooling degree days
- 42
Sinnamahoning in OctoberThis month
Highs average 61°16° and lows 38°3°, with 3.7 in94 mm of precipitation and 0.1 in0.3 cm of snow in a typical October.
- Record high
- 89°32° (2007)
- Record low
- 18°−8° (1969)
- Heating degree days
- 481
- Cooling degree days
- 3
Sinnamahoning in November
Highs average 48°9° and lows 29°−2°, with 3.3 in84 mm of precipitation and 1.8 in4.6 cm of snow in a typical November.
- Record high
- 79°26° (1982)
- Record low
- 4°−16° (1976)
- Heating degree days
- 792
- Cooling degree days
- 0
Sinnamahoning in December
Highs average 37°3° and lows 22°−5°, with 3.3 in84 mm of precipitation and 9 in22 cm of snow in a typical December.
- Record high
- 71°22° (1998)
- Record low
- −13°−25° (1989)
- Heating degree days
- 1099
- Cooling degree days
- 0