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Monthly climate in Bourne, Massachusetts, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Bourne features a humid subtropical climate (Cfa).Temperatures typically range between 1 °C (35 °F) and 23 °C (73 °F) through the year, but rarely can drop to -16 °C (3 °F) or can rise to as high as 34 °C (93 °F).The average annual precipitation amounts to about 1255 mm (49.4 inches) and receives 126 rainy days on the 1 mm (0.04 inches) threshold annually.Bourne enjoys an average of 3011 hours of sunshine throughout the year, and daylight varies from 9 hours 11 minutes to 15 hours 8 minutes per day.

Monthly average temperatures in Bourne, Massachusetts, United States §

The warmest months in Bourne are July, August and September, with daily mean temperatures ranging from 19 to 23 °C (67 - 73 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 1 to 4 °C (35 - 39 °F) throughout the day. On average each year, Bourne experiences 29 days above 25 °C (77.0 °F) and 55 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Bourne, Massachusetts, 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 16°C
(62°F)		 15°C
(59°F)		 16°C
(60°F)		 21°C
(70°F)		 28°C
(82°F)		 28°C
(83°F)		 34°C
(93°F)		 32°C
(90°F)		 28°C
(82°F)		 24°C
(76°F)		 20°C
(69°F)		 16°C
(62°F)
Mean maximum 13°C
(55°F)		 13°C
(55°F)		 13°C
(55°F)		 17°C
(63°F)		 24°C
(75°F)		 26°C
(79°F)		 30°C
(87°F)		 29°C
(85°F)		 26°C
(79°F)		 23°C
(74°F)		 18°C
(66°F)		 15°C
(59°F)
Average high 4°C
(40°F)		 5°C
(41°F)		 6°C
(44°F)		 11°C
(52°F)		 16°C
(60°F)		 21°C
(70°F)		 25°C
(77°F)		 25°C
(77°F)		 22°C
(71°F)		 17°C
(63°F)		 11°C
(53°F)		 6°C
(44°F)
Daily mean 1°C
(35°F)		 2°C
(36°F)		 4°C
(39°F)		 8°C
(47°F)		 13°C
(56°F)		 19°C
(66°F)		 23°C
(73°F)		 23°C
(73°F)		 19°C
(67°F)		 15°C
(59°F)		 8°C
(47°F)		 4°C
(39°F)
Average low -1°C
(30°F)		 -1°C
(31°F)		 1°C
(34°F)		 6°C
(43°F)		 11°C
(52°F)		 16°C
(62°F)		 20°C
(69°F)		 21°C
(70°F)		 17°C
(63°F)		 12°C
(54°F)		 5°C
(42°F)		 1°C
(34°F)
Mean minimum -12°C
(11°F)		 -10°C
(14°F)		 -7°C
(19°F)		 1°C
(35°F)		 6°C
(44°F)		 12°C
(54°F)		 17°C
(62°F)		 17°C
(62°F)		 13°C
(55°F)		 6°C
(42°F)		 -3°C
(27°F)		 -6°C
(21°F)
Minimum -16°C
(3°F)		 -14°C
(7°F)		 -10°C
(15°F)		 -0°C
(32°F)		 4°C
(39°F)		 10°C
(51°F)		 15°C
(59°F)		 15°C
(60°F)		 11°C
(53°F)		 2°C
(36°F)		 -7°C
(20°F)		 -13°C
(8°F)

Compare climate in Bourne with other places

Compare temperature, precipitation, sunshine, UV index in Bourne, Massachusetts, United States with other places around the world.

Monthly average precipitation in Bourne, Massachusetts, United States §

Bourne usually has the most precipitation in April, October and December, with an average of 11 rainy days and 132 mm (5.2 inches) of precipitation per month.The driest months in Bourne are January, June and August. On average, 83 mm (3.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Bourne, Massachusetts, 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) 103 (4.1) 112 (4.4) 125 (4.9) 102 (4.0) 87 (3.4) 91 (3.6) 78 (3.1) 108 (4.2) 151 (5.9) 93 (3.7) 121 (4.8)
Average precipitation days (≥ 1 mm) 9 12 10 13 12 10 9 10 10 11 10 10

Monthly sunshine hours in Bourne, Massachusetts, United States §

The sunniest months in Bourne are June, July and August, when the sun shines an average of 10 hours 53 minutes a day.Least sunny months in Bourne: January, February and December receive an average of 5 hours 23 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Bourne, Massachusetts, 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 142 183 257 242 297 326 346 330 280 236 203 164
Mean daily daylight hours 9h 31m 10h 36m 11h 58m 13h 22m 14h 33m 15h 8m 14h 49m 13h 46m 12h 25m 11h 1m 9h 48m 9h 11m

Solar UV radiation in Bourne, Massachusetts, United States §

Bourne 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, February and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 4. For more detailed information, check out our hourly Bourne UV Index data.

Average daily maximum UV levels by month for Bourne, Massachusetts, 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) 3 4 6 8 9 10 9 9 8 6 4 2