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Monthly climate in Greenfield, Iowa, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Greenfield features a humid continental climate (Dfa).Temperatures typically range between -5 °C (23 °F) and 25 °C (77 °F) through the year, but rarely can drop to -30 °C (-22 °F) or can rise to as high as 39 °C (102 °F).The average annual precipitation amounts to about 980 mm (38.6 inches) and receives 105 rainy days on the 1 mm (0.04 inches) threshold annually.Greenfield enjoys an average of 3057 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 Greenfield, Iowa, United States §

The warmest months in Greenfield are June, July and August, with daily mean temperatures ranging from 23 to 25 °C (74 - 77 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -5 to -1 °C (23 - 31 °F) throughout the day. On average each year, Greenfield experiences 94 days above 25 °C (77.0 °F) and 119 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Greenfield, 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 13°C
(56°F)		 22°C
(71°F)		 24°C
(76°F)		 30°C
(87°F)		 36°C
(96°F)		 39°C
(102°F)		 35°C
(95°F)		 35°C
(96°F)		 34°C
(93°F)		 31°C
(88°F)		 25°C
(77°F)		 22°C
(71°F)
Mean maximum 12°C
(54°F)		 16°C
(61°F)		 21°C
(71°F)		 27°C
(80°F)		 31°C
(89°F)		 34°C
(93°F)		 34°C
(94°F)		 33°C
(92°F)		 32°C
(91°F)		 29°C
(85°F)		 19°C
(67°F)		 17°C
(62°F)
Average high -0°C
(31°F)		 1°C
(34°F)		 10°C
(50°F)		 15°C
(60°F)		 22°C
(71°F)		 29°C
(84°F)		 30°C
(86°F)		 28°C
(83°F)		 25°C
(78°F)		 16°C
(62°F)		 9°C
(48°F)		 4°C
(40°F)
Daily mean -5°C
(23°F)		 -4°C
(25°F)		 4°C
(40°F)		 10°C
(49°F)		 17°C
(62°F)		 23°C
(75°F)		 25°C
(77°F)		 23°C
(74°F)		 20°C
(68°F)		 11°C
(52°F)		 4°C
(39°F)		 -1°C
(31°F)
Average low -9°C
(15°F)		 -9°C
(16°F)		 -0°C
(32°F)		 4°C
(39°F)		 12°C
(54°F)		 18°C
(65°F)		 20°C
(68°F)		 18°C
(65°F)		 15°C
(59°F)		 6°C
(43°F)		 -1°C
(30°F)		 -5°C
(23°F)
Mean minimum -24°C
(-12°F)		 -22°C
(-8°F)		 -11°C
(13°F)		 -6°C
(21°F)		 4°C
(39°F)		 12°C
(53°F)		 14°C
(57°F)		 12°C
(54°F)		 7°C
(45°F)		 -3°C
(27°F)		 -11°C
(12°F)		 -15°C
(5°F)
Minimum -30°C
(-22°F)		 -29°C
(-20°F)		 -21°C
(-5°F)		 -11°C
(13°F)		 2°C
(36°F)		 9°C
(49°F)		 12°C
(55°F)		 10°C
(51°F)		 5°C
(42°F)		 -7°C
(20°F)		 -18°C
(-1°F)		 -24°C
(-10°F)

Compare climate in Greenfield with other places

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

Monthly average precipitation in Greenfield, Iowa, United States §

Greenfield usually has the most precipitation in May, September and October, with an average of 12 rainy days and 138 mm (5.5 inches) of precipitation per month.The driest months in Greenfield are January, November and December. On average, 35 mm (1.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Greenfield, 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) 36 (1.4) 36 (1.4) 83 (3.3) 63 (2.5) 170 (6.7) 107 (4.2) 69 (2.7) 102 (4.0) 117 (4.6) 128 (5.0) 35 (1.4) 35 (1.4)
Average precipitation days (≥ 1 mm) 6 6 10 10 16 10 8 9 10 11 5 4

Monthly sunshine hours in Greenfield, Iowa, United States §

The sunniest months in Greenfield are June, July and August, when the sun shines an average of 11 hours 25 minutes a day.Least sunny months in Greenfield: January, February and November receive an average of 6 hours 4 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Greenfield, 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 142 195 214 259 264 347 372 331 280 224 209 215
Mean daily daylight hours 9h 34m 10h 37m 11h 58m 13h 21m 14h 30m 15h 5m 14h 46m 13h 44m 12h 24m 11h 2m 9h 50m 9h 14m

Solar UV radiation in Greenfield, Iowa, United States §

Greenfield experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / Extreme category of sun exposure.January, November and December are in the 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 Greenfield UV Index data.

Average daily maximum UV levels by month for Greenfield, 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 11 10 9 8 6 4 3