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Monthly climate in Treynor, Iowa, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Treynor features a humid continental climate (Dfa).Temperatures typically range between -4 °C (25 °F) and 25 °C (78 °F) through the year, but rarely can drop to -33 °C (-27 °F) or can rise to as high as 40 °C (103 °F).The average annual precipitation amounts to about 978 mm (38.5 inches) and receives 104 rainy days on the 1 mm (0.04 inches) threshold annually.Treynor enjoys an average of 3091 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 Treynor, Iowa, United States §

The warmest months in Treynor 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 (25 - 31 °F) throughout the day. On average each year, Treynor 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 Treynor, 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)		 40°C
(103°F)		 36°C
(96°F)		 35°C
(95°F)		 35°C
(96°F)		 32°C
(89°F)		 26°C
(80°F)		 22°C
(71°F)
Mean maximum 12°C
(54°F)		 16°C
(61°F)		 23°C
(73°F)		 28°C
(83°F)		 32°C
(90°F)		 35°C
(94°F)		 35°C
(95°F)		 33°C
(92°F)		 33°C
(92°F)		 30°C
(87°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
(83°F)		 26°C
(79°F)		 17°C
(63°F)		 10°C
(50°F)		 5°C
(41°F)
Daily mean -4°C
(25°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)		 21°C
(69°F)		 11°C
(53°F)		 4°C
(40°F)		 -1°C
(31°F)
Average low -9°C
(17°F)		 -9°C
(16°F)		 -0°C
(32°F)		 4°C
(40°F)		 12°C
(54°F)		 18°C
(66°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
(-10°F)		 -22°C
(-7°F)		 -11°C
(13°F)		 -6°C
(22°F)		 4°C
(39°F)		 12°C
(54°F)		 14°C
(58°F)		 12°C
(53°F)		 7°C
(45°F)		 -3°C
(27°F)		 -10°C
(14°F)		 -15°C
(5°F)
Minimum -30°C
(-21°F)		 -33°C
(-27°F)		 -21°C
(-5°F)		 -10°C
(14°F)		 2°C
(36°F)		 9°C
(49°F)		 13°C
(55°F)		 10°C
(51°F)		 4°C
(40°F)		 -7°C
(20°F)		 -16°C
(4°F)		 -23°C
(-10°F)

Compare climate in Treynor with other places

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

Monthly average precipitation in Treynor, Iowa, United States §

Treynor usually has the most precipitation in May, June and October, with an average of 12 rainy days and 140 mm (5.5 inches) of precipitation per month.The driest months in Treynor 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 Treynor, 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 (1.3) 93 (3.7) 59 (2.3) 156 (6.2) 125 (4.9) 73 (2.9) 103 (4.1) 98 (3.9) 137 (5.4) 32 (1.3) 35 (1.4)
Average precipitation days (≥ 1 mm) 5 6 11 10 16 10 7 10 10 10 5 4

Monthly sunshine hours in Treynor, Iowa, United States §

The sunniest months in Treynor are June, July and August, when the sun shines an average of 11 hours 25 minutes a day.Least sunny months in Treynor: January, February and November receive an average of 6 hours 18 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Treynor, 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 152 204 213 262 264 349 374 326 278 233 211 220
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 Treynor, Iowa, United States §

Treynor 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 Treynor UV Index data.

Average daily maximum UV levels by month for Treynor, 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