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Monthly climate in Bethlehem, New Hampshire, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Bethlehem features a humid continental climate (Dfb).Temperatures typically range between -8 °C (17 °F) and 19 °C (67 °F) through the year, but rarely can drop to -31 °C (-23 °F) or can rise to as high as 33 °C (91 °F).The average annual precipitation amounts to about 1222 mm (48.1 inches) and receives 157 rainy days on the 1 mm (0.04 inches) threshold annually.Bethlehem enjoys an average of 2639 hours of sunshine throughout the year, and daylight varies from 8 hours 54 minutes to 15 hours 26 minutes per day.

Monthly average temperatures in Bethlehem, New Hampshire, United States §

The warmest months in Bethlehem are June, July and August, with daily mean temperatures ranging from 17 to 19 °C (62 - 67 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -8 to -6 °C (17 - 22 °F) throughout the day. On average each year, Bethlehem experiences 30 days above 25 °C (77.0 °F) and 151 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Bethlehem, New Hampshire, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 12°C
(54°F)		 16°C
(62°F)		 18°C
(65°F)		 24°C
(76°F)		 31°C
(87°F)		 31°C
(88°F)		 33°C
(91°F)		 32°C
(89°F)		 29°C
(85°F)		 24°C
(76°F)		 21°C
(71°F)		 13°C
(56°F)
Mean maximum 7°C
(45°F)		 10°C
(50°F)		 13°C
(55°F)		 19°C
(66°F)		 28°C
(83°F)		 28°C
(82°F)		 29°C
(85°F)		 30°C
(85°F)		 27°C
(81°F)		 22°C
(72°F)		 16°C
(60°F)		 10°C
(50°F)
Average high -4°C
(25°F)		 -2°C
(29°F)		 2°C
(36°F)		 9°C
(48°F)		 17°C
(63°F)		 22°C
(71°F)		 24°C
(76°F)		 24°C
(75°F)		 20°C
(68°F)		 13°C
(55°F)		 4°C
(40°F)		 -2°C
(29°F)
Daily mean -8°C
(17°F)		 -7°C
(20°F)		 -3°C
(27°F)		 4°C
(40°F)		 12°C
(53°F)		 17°C
(62°F)		 19°C
(67°F)		 18°C
(66°F)		 15°C
(58°F)		 8°C
(47°F)		 -0°C
(32°F)		 -6°C
(22°F)
Average low -13°C
(9°F)		 -12°C
(11°F)		 -7°C
(19°F)		 0°C
(32°F)		 6°C
(43°F)		 11°C
(52°F)		 15°C
(58°F)		 14°C
(57°F)		 10°C
(50°F)		 4°C
(39°F)		 -4°C
(24°F)		 -10°C
(14°F)
Mean minimum -26°C
(-15°F)		 -24°C
(-11°F)		 -20°C
(-4°F)		 -8°C
(17°F)		 -1°C
(30°F)		 5°C
(42°F)		 8°C
(47°F)		 7°C
(44°F)		 0°C
(33°F)		 -4°C
(24°F)		 -16°C
(3°F)		 -25°C
(-12°F)
Minimum -31°C
(-23°F)		 -27°C
(-16°F)		 -22°C
(-8°F)		 -12°C
(10°F)		 -3°C
(27°F)		 -1°C
(31°F)		 7°C
(44°F)		 4°C
(40°F)		 -5°C
(23°F)		 -7°C
(20°F)		 -21°C
(-5°F)		 -30°C
(-21°F)

Compare climate in Bethlehem with other places

Compare temperature, precipitation, sunshine, UV index in Bethlehem, New Hampshire, United States with other places around the world.

Monthly average precipitation in Bethlehem, New Hampshire, United States §

Bethlehem usually has the most precipitation in April, July and October, with an average of 14 rainy days and 128 mm (5.0 inches) of precipitation per month.The driest months in Bethlehem are February, March and September. On average, 77 mm (3.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Bethlehem, New Hampshire, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 86 (3.4) 85 (3.4) 77 (3.0) 125 (4.9) 104 (4.1) 109 (4.3) 119 (4.7) 91 (3.6) 69 (2.7) 140 (5.5) 116 (4.6) 100 (3.9)
Average precipitation days (≥ 1 mm) 12 13 11 16 13 12 14 13 9 14 15 15

Monthly sunshine hours in Bethlehem, New Hampshire, United States §

The sunniest months in Bethlehem are June, July and August, when the sun shines an average of 10 hours 18 minutes a day.Least sunny months in Bethlehem: January, November and December receive an average of 4 hours 19 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Bethlehem, New Hampshire, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 110 153 225 206 250 308 318 321 274 183 150 136
Mean daily daylight hours 9h 17m 10h 28m 11h 57m 13h 29m 14h 47m 15h 26m 15h 5m 13h 55m 12h 27m 10h 55m 9h 35m 8h 54m

Solar UV radiation in Bethlehem, New Hampshire, United States §

Bethlehem experiences the highest level of ultraviolet (UV) radiation in May, June and August, when the maximum UV index can reach values of 9 - 10, which corresponds to the Very High category of sun exposure.January, November and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 3. For more detailed information, check out our hourly Bethlehem UV Index data.

Average daily maximum UV levels by month for Bethlehem, New Hampshire, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 2 4 6 8 9 10 9 9 7 5 3 2