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Monthly climate in Foster, Rhode Island, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Foster features a oceanic climate (Cfb).Temperatures typically range between 0 °C (31 °F) and 23 °C (74 °F) through the year, but rarely can drop to -21 °C (-6 °F) or can rise to as high as 38 °C (101 °F).The average annual precipitation amounts to about 1297 mm (51.1 inches) and receives 131 rainy days on the 1 mm (0.04 inches) threshold annually.Foster enjoys an average of 3024 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 Foster, Rhode Island, United States §

The warmest months in Foster are June, July and August, with daily mean temperatures ranging from 20 to 23 °C (69 - 74 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 0 to 1 °C (31 - 35 °F) throughout the day. On average each year, Foster experiences 70 days above 25 °C (77.0 °F) and 95 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Foster, Rhode Island, 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 21°C
(69°F)		 21°C
(70°F)		 23°C
(73°F)		 30°C
(86°F)		 34°C
(94°F)		 36°C
(97°F)		 38°C
(101°F)		 35°C
(95°F)		 34°C
(94°F)		 29°C
(85°F)		 24°C
(75°F)		 17°C
(63°F)
Mean maximum 14°C
(58°F)		 17°C
(63°F)		 19°C
(66°F)		 22°C
(72°F)		 31°C
(88°F)		 33°C
(92°F)		 36°C
(98°F)		 33°C
(91°F)		 30°C
(87°F)		 26°C
(80°F)		 22°C
(71°F)		 16°C
(61°F)
Average high 4°C
(39°F)		 5°C
(42°F)		 8°C
(47°F)		 14°C
(57°F)		 20°C
(68°F)		 25°C
(78°F)		 28°C
(83°F)		 28°C
(82°F)		 24°C
(75°F)		 18°C
(65°F)		 11°C
(52°F)		 5°C
(42°F)
Daily mean -0°C
(31°F)		 1°C
(34°F)		 4°C
(39°F)		 9°C
(49°F)		 15°C
(59°F)		 20°C
(69°F)		 23°C
(74°F)		 23°C
(73°F)		 19°C
(66°F)		 13°C
(56°F)		 6°C
(43°F)		 1°C
(35°F)
Average low -4°C
(24°F)		 -3°C
(26°F)		 -1°C
(31°F)		 5°C
(41°F)		 10°C
(50°F)		 15°C
(60°F)		 19°C
(67°F)		 19°C
(66°F)		 15°C
(58°F)		 9°C
(49°F)		 1°C
(35°F)		 -3°C
(28°F)
Mean minimum -17°C
(2°F)		 -16°C
(4°F)		 -10°C
(13°F)		 -2°C
(29°F)		 3°C
(39°F)		 10°C
(51°F)		 14°C
(58°F)		 12°C
(54°F)		 7°C
(45°F)		 -0°C
(32°F)		 -7°C
(19°F)		 -12°C
(11°F)
Minimum -21°C
(-6°F)		 -19°C
(-3°F)		 -16°C
(4°F)		 -5°C
(23°F)		 1°C
(35°F)		 6°C
(43°F)		 13°C
(55°F)		 9°C
(49°F)		 4°C
(40°F)		 -6°C
(21°F)		 -11°C
(12°F)		 -16°C
(3°F)

Compare climate in Foster with other places

Compare temperature, precipitation, sunshine, UV index in Foster, Rhode Island, United States with other places around the world.

Monthly average precipitation in Foster, Rhode Island, United States §

Foster usually has the most precipitation in April, July and October, with an average of 13 rainy days and 136 mm (5.4 inches) of precipitation per month.The driest months in Foster are January, February and September. On average, 84 mm (3.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Foster, Rhode Island, 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) 71 (2.8) 89 (3.5) 96 (3.8) 130 (5.1) 107 (4.2) 99 (3.9) 145 (5.7) 112 (4.4) 93 (3.7) 133 (5.2) 98 (3.9) 124 (4.9)
Average precipitation days (≥ 1 mm) 8 10 10 13 12 11 14 12 9 12 10 10

Monthly sunshine hours in Foster, Rhode Island, United States §

The sunniest months in Foster are June, July and August, when the sun shines an average of 10 hours 49 minutes a day.Least sunny months in Foster: January, February and December receive an average of 5 hours 39 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Foster, Rhode Island, 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 148 188 260 248 291 322 346 326 281 227 205 176
Mean daily daylight hours 9h 31m 10h 36m 11h 58m 13h 22m 14h 33m 15h 8m 14h 49m 13h 45m 12h 25m 11h 1m 9h 48m 9h 11m

Solar UV radiation in Foster, Rhode Island, United States §

Foster 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 4. For more detailed information, check out our hourly Foster UV Index data.

Average daily maximum UV levels by month for Foster, Rhode Island, 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 5 6 8 9 10 9 9 8 6 4 2