Riverside weather by month
What a typical year looks like in Riverside, Pennsylvania: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Selinsgrove Penn Valley Airport, 24 km from Riverside; records cover 1947–2026.
The year at a glance
- Precipitation a year
- 40.9 in1039 mm
- Snow a year
- Rare
- Last spring freeze
- Apr 29
- First fall freeze
- Oct 18
- Heating degree days
- 5,790
- Cooling degree days
- 744
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 94°34° (cooling, 1%).
Month by month
Riverside in January
Highs average 36°2° and lows 20°−7°, with 2.7 in68 mm of precipitation in a typical January.
- Record high
- 69°21° (2002)
- Record low
- −22°−30° (1948)
- Heating degree days
- 1147
- Cooling degree days
- 0
Riverside in February
Highs average 39°4° and lows 21°−6°, with 2.1 in52 mm of precipitation in a typical February.
- Record high
- 76°24° (2018)
- Record low
- −14°−26° (1948)
- Heating degree days
- 974
- Cooling degree days
- 0
Riverside in March
Highs average 49°9° and lows 29°−2°, with 3.1 in78 mm of precipitation in a typical March.
- Record high
- 87°31° (1998)
- Record low
- −4°−20° (2003)
- Heating degree days
- 808
- Cooling degree days
- 0
Riverside in April
Highs average 62°17° and lows 38°3°, with 3.6 in90 mm of precipitation in a typical April.
- Record high
- 93°34° (2002)
- Record low
- 18°−8° (1954)
- Heating degree days
- 452
- Cooling degree days
- 5
Riverside in May
Highs average 72°22° and lows 49°9°, with 3.6 in90 mm of precipitation in a typical May.
- Record high
- 94°34° (2006)
- Record low
- 29°−2° (1956)
- Heating degree days
- 184
- Cooling degree days
- 43
Riverside in June
Highs average 81°27° and lows 59°15°, with 3.9 in100 mm of precipitation in a typical June.
- Record high
- 102°39° (1952)
- Record low
- 39°4° (2003)
- Heating degree days
- 26
- Cooling degree days
- 163
Riverside in July
Highs average 84°29° and lows 62°17°, with 4.2 in106 mm of precipitation in a typical July.
- Record high
- 104°40° (2010)
- Record low
- 46°8° (1952)
- Heating degree days
- 2
- Cooling degree days
- 260
Riverside in August
Highs average 82°28° and lows 60°16°, with 3.7 in95 mm of precipitation in a typical August.
- Record high
- 100°38° (1953)
- Record low
- 40°4° (1951)
- Heating degree days
- 9
- Cooling degree days
- 198
Riverside in September
Highs average 76°24° and lows 52°11°, with 4.5 in115 mm of precipitation in a typical September.
- Record high
- 102°39° (1953)
- Record low
- 25°−4° (1947)
- Heating degree days
- 100
- Cooling degree days
- 67
Riverside in OctoberThis month
Highs average 64°18° and lows 41°5°, with 3.8 in96 mm of precipitation in a typical October.
- Record high
- 93°34° (2007)
- Record low
- 21°−6° (1952)
- Heating degree days
- 395
- Cooling degree days
- 8
Riverside in November
Highs average 52°11° and lows 32°0°, with 3.1 in77 mm of precipitation in a typical November.
- Record high
- 84°29° (1950)
- Record low
- 10°−12° (2008)
- Heating degree days
- 696
- Cooling degree days
- 0
Riverside in December
Highs average 41°5° and lows 25°−4°, with 2.8 in71 mm of precipitation in a typical December.
- Record high
- 72°22° (1998)
- Record low
- −16°−27° (1951)
- Heating degree days
- 997
- Cooling degree days
- 0