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Monthly climate in Griswold, Iowa, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Griswold features a humid continental climate (Dfa).Temperatures typically range between -4 °C (24 °F) and 25 °C (78 °F) through the year, but rarely can drop to -32 °C (-26 °F) or can rise to as high as 39 °C (103 °F).The average annual precipitation amounts to about 970 mm (38.2 inches) and receives 102 rainy days on the 1 mm (0.04 inches) threshold annually.Griswold enjoys an average of 3069 hours of sunshine throughout the year, and daylight varies from 9 hours 14 minutes to 15 hours 5 minutes per day.

Monthly average temperatures in Griswold, Iowa, United States §

The warmest months in Griswold are June, July and August, with daily mean temperatures ranging from 23 to 25 °C (74 - 78 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -4 to -1 °C (24 - 31 °F) throughout the day. On average each year, Griswold experiences 101 days above 25 °C (77.0 °F) and 118 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Griswold, Iowa, 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 14°C
(57°F)		 22°C
(71°F)		 26°C
(79°F)		 31°C
(88°F)		 36°C
(97°F)		 39°C
(103°F)		 36°C
(97°F)		 35°C
(95°F)		 35°C
(96°F)		 31°C
(89°F)		 26°C
(79°F)		 22°C
(71°F)
Mean maximum 12°C
(54°F)		 16°C
(61°F)		 22°C
(73°F)		 28°C
(82°F)		 32°C
(90°F)		 34°C
(94°F)		 35°C
(95°F)		 33°C
(92°F)		 33°C
(92°F)		 30°C
(86°F)		 20°C
(68°F)		 16°C
(61°F)
Average high 0°C
(33°F)		 2°C
(35°F)		 10°C
(51°F)		 16°C
(61°F)		 22°C
(72°F)		 29°C
(85°F)		 30°C
(86°F)		 28°C
(84°F)		 26°C
(79°F)		 17°C
(62°F)		 10°C
(49°F)		 5°C
(41°F)
Daily mean -4°C
(24°F)		 -4°C
(25°F)		 5°C
(41°F)		 10°C
(50°F)		 17°C
(63°F)		 24°C
(75°F)		 25°C
(78°F)		 23°C
(74°F)		 20°C
(69°F)		 11°C
(53°F)		 4°C
(40°F)		 -1°C
(31°F)
Average low -9°C
(16°F)		 -9°C
(16°F)		 -0°C
(32°F)		 4°C
(40°F)		 12°C
(54°F)		 18°C
(65°F)		 20°C
(69°F)		 18°C
(65°F)		 15°C
(59°F)		 6°C
(44°F)		 -1°C
(30°F)		 -5°C
(23°F)
Mean minimum -24°C
(-11°F)		 -22°C
(-7°F)		 -11°C
(13°F)		 -6°C
(21°F)		 4°C
(39°F)		 12°C
(54°F)		 14°C
(58°F)		 12°C
(53°F)		 7°C
(44°F)		 -3°C
(27°F)		 -11°C
(13°F)		 -15°C
(5°F)
Minimum -30°C
(-21°F)		 -32°C
(-26°F)		 -21°C
(-5°F)		 -10°C
(14°F)		 2°C
(36°F)		 9°C
(48°F)		 13°C
(55°F)		 10°C
(50°F)		 4°C
(40°F)		 -7°C
(20°F)		 -16°C
(4°F)		 -23°C
(-9°F)

Compare climate in Griswold with other places

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

Monthly average precipitation in Griswold, Iowa, United States §

Griswold usually has the most precipitation in May, June and October, with an average of 12 rainy days and 136 mm (5.4 inches) of precipitation per month.The driest months in Griswold are January, February and November. On average, 33 mm (1.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Griswold, Iowa, 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) 32 (1.3) 34 (1.4) 89 (3.5) 60 (2.4) 158 (6.2) 116 (4.6) 67 (2.6) 104 (4.1) 109 (4.3) 134 (5.3) 32 (1.3) 36 (1.4)
Average precipitation days (≥ 1 mm) 5 6 10 10 16 10 7 9 10 10 5 4

Monthly sunshine hours in Griswold, Iowa, United States §

The sunniest months in Griswold are June, July and August, when the sun shines an average of 11 hours 24 minutes a day.Least sunny months in Griswold: January, February and November receive an average of 6 hours 12 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Griswold, Iowa, 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 148 200 212 260 262 348 373 327 278 228 210 219
Mean daily daylight hours 9h 34m 10h 37m 11h 58m 13h 20m 14h 30m 15h 5m 14h 46m 13h 44m 12h 24m 11h 2m 9h 50m 9h 14m

Solar UV radiation in Griswold, Iowa, United States §

Griswold experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 10 - 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 Griswold UV Index data.

Average daily maximum UV levels by month for Griswold, Iowa, 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 10 10 10 9 8 6 4 2