Thornton, New Hampshire Climate

United States

Pop. 1,963 Elev. 203 m / 666 ft TZ: America/New_York (UTC-4) ·

Thornton experiences a wide climate range, from bitterly cold winters of 7°F (-14°C) in January to mild summers reaching 78°F (26°C) in July. Wind chill can push winter lows to -3°F (-19°C). Precipitation occurs on roughly 53 days per year (33.6 in / 854 mm total), with snow on 16 days and 110 in (2804 mm) of annual accumulation. Overcast skies are common, with only 79 sunny days per year. Nearby lake water reaches 72°F (22°C) in summer.

Temperature 78°F (25°C) high 7°F (-14°C) low
Feels like -3°F (-19°C) low
Rain 53 days 33.6 in (854 mm) /yr
Snow 16 days 110.4 in (2804 mm) /yr
Sky 79 sunny 18 stormy
Wind 2.4 mph (1.1 m/s) avg

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Monthly Climate Chart

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

Sky & Air by Month

Cloud cover (%)
71
Jan
71
Feb
70
Mar
71
Apr
79
May
62
Jun
61
Jul
48
Aug
45
Sep
50
Oct
77
Nov
77
Dec
Humidity (%)
71
Jan
70
Feb
65
Mar
59
Apr
74
May
72
Jun
74
Jul
68
Aug
70
Sep
73
Oct
77
Nov
75
Dec

Weather Days by Month

↓ Weather days table

Water Temperatures

↓ Water temperatures table

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Nearby Cities

Nearby

Commercial airport 36 mi Lebanon Municipal Airport (LEB)
Ski resort 4 mi Campton Mountain
National park 61 mi Grafton Notch State Park
Mountain peak (5,089 ft) 18 mi Mount Lincoln
Hospital 9 mi Speare Memorial Hospital
Hiking trail 5 mi Welch-Dickey Loop Trail

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Monthly Weather Data

↑ See chart
Month Avg High Avg Low Rainfall Snowfall Sunny Days
January 23°F -5°C 7°F -14°C 0.1 in 2 mm 15.3 in389 mm 6
February 25°F -4°C 10°F -12°C 0.4 in 11 mm 33.6 in853 mm 3
March 42°F 6°C 23°F -5°C 3.1 in 79 mm 18.2 in461 mm 5
April 53°F 12°C 34°F 1°C 3.3 in 84 mm 9.6 in244 mm 4
May 61°F 16°C 45°F 7°C 6.4 in 163 mm 0.1 in3 mm 4
June 73°F 23°C 54°F 12°C 3.3 in 84 mm 9
July 78°F 25°C 60°F 15°C 3.9 in 100 mm 7
August 75°F 24°C 53°F 12°C 1.0 in 25 mm 11
September 69°F 21°C 47°F 9°C 3.2 in 80 mm 15
October 56°F 13°C 37°F 3°C 4.5 in 115 mm 11
November 38°F 3°C 28°F -2°C 2.7 in 68 mm 12.7 in322 mm 3
December 26°F -3°C 9°F -13°C 1.7 in 44 mm 20.9 in532 mm 1

Weather Days by Month

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

Water Temperatures Data

↑ See chart
Month Lake Avg High
January 32°F 0°C
February 32°F 0°C
March 32°F 0°C
April 35°F 1°C
May 45°F 7°C
June 58°F 14°C
July 72°F 22°C
August 70°F 21°C
September 63°F 17°C
October 53°F 12°C
November 41°F 5°C
December 33°F 0°C