Northumberland, Pennsylvania Climate

United States

Pop. 3,728 Elev. 152 m / 499 ft TZ: America/New_York (UTC-4) ·

Summers in Northumberland are warm, with July highs around 85°F (29°C), while winters are frigid with January lows of 21°F (-6°C). Humidity pushes the summer feels-like temperature to 95°F (35°C), while wind chill can drive winter lows to 14°F (-10°C). Expect around 54 rainy days annually (36.6 in / 930 mm total), with snow on 3 days and 28 in (715 mm) of annual accumulation. The city averages 106 sunny days per year and around 25 thunderstorm days.

Temperature 85°F (30°C) high 21°F (-6°C) low
Feels like 95°F (35°C) high 14°F (-10°C) low
Rain 54 days 36.6 in (930 mm) /yr
Snow 3 days 28.1 in (715 mm) /yr
Sky 106 sunny 25 stormy
Wind 2.2 mph (1.0 m/s) avg

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Monthly Climate Chart

↓ Monthly data table
Best months to visit: Apr, Aug, Sep

Sky & Air by Month

Cloud cover (%)
57
Jan
74
Feb
51
Mar
72
Apr
74
May
63
Jun
57
Jul
44
Aug
52
Sep
40
Oct
62
Nov
69
Dec
Humidity (%)
56
Jan
57
Feb
52
Mar
55
Apr
71
May
72
Jun
74
Jul
67
Aug
66
Sep
67
Oct
64
Nov
65
Dec

Weather Days by Month

↓ Weather days table

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Nearby Cities

Nearby

Commercial airport 25 mi Williamsport Regional Airport (IPT)
Ski resort 36 mi Eagle Rock Ski Resort
National park 99 mi Appalachian National Scenic Trail
Mountain peak (5,102 ft) 266 mi Algonquin Peak
Hospital 2 mi UPMC Susquehanna Sunbury
Hiking trail 20 mi Winter Park Hiking

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Monthly Weather Data

↑ See chart
Month Avg High Avg Low Rainfall Snowfall Sunny Days
January 33°F 0°C 21°F -6°C 0.5 in 13 mm 5.1 in129 mm 9
February 38°F 3°C 26°F -3°C 2.1 in 53 mm 9.0 in229 mm 1
March 57°F 14°C 35°F 2°C 2.8 in 71 mm 0.2 in5 mm 11
April 63°F 17°C 44°F 7°C 3.6 in 92 mm 0.1 in3 mm 5
May 69°F 21°C 53°F 12°C 6.9 in 174 mm 4
June 81°F 27°C 63°F 17°C 5.0 in 127 mm 9
July 85°F 30°C 68°F 20°C 4.1 in 103 mm 8
August 80°F 27°C 60°F 15°C 2.4 in 60 mm 16
September 78°F 26°C 56°F 13°C 1.5 in 38 mm 15
October 64°F 18°C 45°F 7°C 4.5 in 114 mm 18
November 51°F 10°C 36°F 2°C 1.6 in 41 mm 2.7 in69 mm 3
December 36°F 2°C 23°F -5°C 1.8 in 44 mm 11.0 in280 mm 7

Weather Days by Month

↑ See chart
Month Sunny Days Storm Days
January 9 0
February 1 0
March 11 2
April 5 2
May 4 5
June 9 5
July 8 6
August 16 2
September 15 1
October 18 1
November 3 0
December 7 1