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Monthly climate in Saint Johnsbury, Vermont, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Saint Johnsbury features a humid continental climate (Dfb).Temperatures typically range between -8 °C (18 °F) and 20 °C (69 °F) through the year, but rarely can drop to -35 °C (-31 °F) or can rise to as high as 34 °C (93 °F).The average annual precipitation amounts to about 1113 mm (43.8 inches) and receives 150 rainy days on the 1 mm (0.04 inches) threshold annually.Saint Johnsbury enjoys an average of 2639 hours of sunshine throughout the year, and daylight varies from 8 hours 53 minutes to 15 hours 27 minutes per day.

Monthly average temperatures in Saint Johnsbury, Vermont, United States §

The warmest months in Saint Johnsbury are June, July and August, with daily mean temperatures ranging from 17 to 20 °C (63 - 69 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -8 to -5 °C (18 - 23 °F) throughout the day. On average each year, Saint Johnsbury experiences 44 days above 25 °C (77.0 °F) and 145 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Saint Johnsbury, Vermont, 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 13°C
(56°F)		 18°C
(65°F)		 20°C
(69°F)		 25°C
(78°F)		 32°C
(90°F)		 33°C
(91°F)		 34°C
(93°F)		 33°C
(91°F)		 30°C
(86°F)		 25°C
(77°F)		 22°C
(72°F)		 14°C
(58°F)
Mean maximum 8°C
(46°F)		 11°C
(52°F)		 15°C
(59°F)		 20°C
(69°F)		 29°C
(85°F)		 29°C
(85°F)		 30°C
(87°F)		 31°C
(87°F)		 28°C
(82°F)		 22°C
(73°F)		 16°C
(61°F)		 11°C
(51°F)
Average high -3°C
(26°F)		 -1°C
(30°F)		 3°C
(38°F)		 10°C
(51°F)		 18°C
(65°F)		 23°C
(73°F)		 25°C
(78°F)		 25°C
(76°F)		 21°C
(70°F)		 14°C
(57°F)		 5°C
(41°F)		 -1°C
(31°F)
Daily mean -8°C
(18°F)		 -6°C
(21°F)		 -2°C
(29°F)		 5°C
(42°F)		 12°C
(55°F)		 17°C
(63°F)		 20°C
(69°F)		 19°C
(67°F)		 15°C
(60°F)		 9°C
(48°F)		 0°C
(33°F)		 -5°C
(23°F)
Average low -13°C
(9°F)		 -12°C
(11°F)		 -7°C
(20°F)		 1°C
(34°F)		 7°C
(44°F)		 11°C
(53°F)		 15°C
(59°F)		 14°C
(57°F)		 10°C
(50°F)		 4°C
(40°F)		 -4°C
(25°F)		 -9°C
(15°F)
Mean minimum -28°C
(-17°F)		 -25°C
(-12°F)		 -21°C
(-5°F)		 -7°C
(20°F)		 -0°C
(32°F)		 6°C
(42°F)		 9°C
(49°F)		 7°C
(46°F)		 1°C
(34°F)		 -4°C
(25°F)		 -16°C
(4°F)		 -25°C
(-13°F)
Minimum -35°C
(-31°F)		 -29°C
(-20°F)		 -23°C
(-10°F)		 -9°C
(16°F)		 -1°C
(30°F)		 -1°C
(31°F)		 8°C
(46°F)		 4°C
(39°F)		 -5°C
(23°F)		 -6°C
(22°F)		 -21°C
(-5°F)		 -31°C
(-24°F)

Compare climate in Saint Johnsbury with other places

Compare temperature, precipitation, sunshine, UV index in Saint Johnsbury, Vermont, United States with other places around the world.

Monthly average precipitation in Saint Johnsbury, Vermont, United States §

Saint Johnsbury usually has the most precipitation in April, July and October, with an average of 14 rainy days and 118 mm (4.6 inches) of precipitation per month.The driest months in Saint Johnsbury are February, March and September. On average, 70 mm (2.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Saint Johnsbury, Vermont, 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) 80 (3.1) 78 (3.1) 69 (2.7) 110 (4.3) 95 (3.7) 98 (3.9) 106 (4.2) 88 (3.5) 64 (2.5) 138 (5.5) 103 (4.0) 85 (3.3)
Average precipitation days (≥ 1 mm) 12 13 10 14 12 12 14 13 8 14 14 14

Monthly sunshine hours in Saint Johnsbury, Vermont, United States §

The sunniest months in Saint Johnsbury are June, July and August, when the sun shines an average of 10 hours 28 minutes a day.Least sunny months in Saint Johnsbury: January, November and December receive an average of 4 hours 6 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Saint Johnsbury, Vermont, 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 106 150 220 208 255 311 324 327 279 184 143 127
Mean daily daylight hours 9h 15m 10h 27m 11h 57m 13h 29m 14h 48m 15h 27m 15h 6m 13h 56m 12h 27m 10h 55m 9h 34m 8h 53m

Solar UV radiation in Saint Johnsbury, Vermont, United States §

Saint Johnsbury 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 Saint Johnsbury UV Index data.

Average daily maximum UV levels by month for Saint Johnsbury, Vermont, 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 5 8 9 10 9 9 7 5 3 2