Lebanon weather by month
What a typical year looks like in Lebanon, New Hampshire: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at LEBANON MUNICIPAL AIRPORT, 4 km from Lebanon; records cover 1948–2026.
The year at a glance
- Precipitation a year
- 38.1 in967 mm
- Snow a year
- Rare
- Last spring freeze
- May 13
- First fall freeze
- Oct 8
- Heating degree days
- 7,333
- Cooling degree days
- 461
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −14°−26° (heating, 99%) and 93°34° (cooling, 1%).
Month by month
Lebanon in January
Highs average 30°−1° and lows 9°−13°, with 2.3 in58 mm of precipitation in a typical January.
- Record high
- 67°19° (2007)
- Record low
- −34°−37° (1957)
- Heating degree days
- 1401
- Cooling degree days
- 0
Lebanon in February
Highs average 34°1° and lows 11°−12°, with 2.1 in53 mm of precipitation in a typical February.
- Record high
- 68°20° (2018)
- Record low
- −30°−34° (1958)
- Heating degree days
- 1191
- Cooling degree days
- 0
Lebanon in March
Highs average 43°6° and lows 21°−6°, with 2.7 in69 mm of precipitation in a typical March.
- Record high
- 85°29° (2012)
- Record low
- −26°−32° (1950)
- Heating degree days
- 1028
- Cooling degree days
- 0
Lebanon in April
Highs average 57°14° and lows 32°0°, with 3 in76 mm of precipitation in a typical April.
- Record high
- 91°33° (1976)
- Record low
- 2°−17° (2016)
- Heating degree days
- 624
- Cooling degree days
- 2
Lebanon in May
Highs average 70°21° and lows 44°7°, with 3.3 in84 mm of precipitation in a typical May.
- Record high
- 96°36° (2010)
- Record low
- 20°−7° (1956)
- Heating degree days
- 277
- Cooling degree days
- 20
Lebanon in June
Highs average 78°26° and lows 52°11°, with 3.8 in97 mm of precipitation in a typical June.
- Record high
- 100°38° (2025)
- Record low
- 30°−1° (1951)
- Heating degree days
- 75
- Cooling degree days
- 80
Lebanon in July
Highs average 83°28° and lows 58°14°, with 4 in101 mm of precipitation in a typical July.
- Record high
- 99°37° (1977)
- Record low
- 38°3° (1957)
- Heating degree days
- 14
- Cooling degree days
- 176
Lebanon in August
Highs average 81°27° and lows 56°13°, with 3.6 in92 mm of precipitation in a typical August.
- Record high
- 98°37° (2022)
- Record low
- 30°−1° (1965)
- Heating degree days
- 27
- Cooling degree days
- 140
Lebanon in September
Highs average 73°23° and lows 49°9°, with 3.4 in87 mm of precipitation in a typical September.
- Record high
- 95°35° (1953)
- Record low
- 20°−7° (1963)
- Heating degree days
- 169
- Cooling degree days
- 41
Lebanon in OctoberThis month
Highs average 60°15° and lows 37°3°, with 4 in102 mm of precipitation in a typical October.
- Record high
- 87°31° (1963)
- Record low
- 13°−11° (1964)
- Heating degree days
- 511
- Cooling degree days
- 2
Lebanon in November
Highs average 47°8° and lows 28°−2°, with 3 in76 mm of precipitation in a typical November.
- Record high
- 80°27° (1950)
- Record low
- −10°−23° (1951)
- Heating degree days
- 832
- Cooling degree days
- 0
Lebanon in December
Highs average 36°2° and lows 18°−8°, with 2.8 in72 mm of precipitation in a typical December.
- Record high
- 69°21° (1998)
- Record low
- −27°−33° (1951)
- Heating degree days
- 1184
- Cooling degree days
- 0