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Monthly climate in Riley, Kansas, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Riley features a humid subtropical climate (Cfa).Temperatures typically range between -1 °C (31 °F) and 27 °C (81 °F) through the year, but rarely can drop to -24 °C (-11 °F) or can rise to as high as 41 °C (106 °F).The average annual precipitation amounts to about 893 mm (35.1 inches) and receives 90 rainy days on the 1 mm (0.04 inches) threshold annually.Riley enjoys an average of 3220 hours of sunshine throughout the year, and daylight varies from 9 hours 26 minutes to 14 hours 52 minutes per day.

Monthly average temperatures in Riley, Kansas, United States §

The warmest months in Riley are June, July and August, with daily mean temperatures ranging from 25 to 27 °C (78 - 81 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -1 to 3 °C (31 - 37 °F) throughout the day. On average each year, Riley experiences 123 days above 25 °C (77.0 °F) and 93 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Riley, Kansas, 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 18°C
(66°F)		 25°C
(77°F)		 33°C
(92°F)		 33°C
(91°F)		 37°C
(99°F)		 41°C
(106°F)		 40°C
(104°F)		 37°C
(99°F)		 37°C
(99°F)		 34°C
(94°F)		 28°C
(82°F)		 24°C
(75°F)
Mean maximum 16°C
(61°F)		 21°C
(70°F)		 27°C
(81°F)		 31°C
(87°F)		 32°C
(91°F)		 36°C
(98°F)		 38°C
(101°F)		 36°C
(96°F)		 35°C
(96°F)		 32°C
(91°F)		 23°C
(74°F)		 19°C
(67°F)
Average high 5°C
(42°F)		 6°C
(43°F)		 14°C
(58°F)		 19°C
(67°F)		 24°C
(76°F)		 32°C
(89°F)		 33°C
(91°F)		 31°C
(87°F)		 29°C
(84°F)		 20°C
(68°F)		 13°C
(55°F)		 9°C
(48°F)
Daily mean -1°C
(31°F)		 0°C
(32°F)		 8°C
(46°F)		 12°C
(55°F)		 19°C
(66°F)		 26°C
(79°F)		 27°C
(81°F)		 25°C
(78°F)		 23°C
(73°F)		 14°C
(57°F)		 7°C
(44°F)		 3°C
(37°F)
Average low -5°C
(23°F)		 -5°C
(23°F)		 2°C
(36°F)		 6°C
(43°F)		 13°C
(57°F)		 20°C
(68°F)		 22°C
(72°F)		 20°C
(68°F)		 17°C
(63°F)		 8°C
(47°F)		 1°C
(34°F)		 -3°C
(28°F)
Mean minimum -16°C
(3°F)		 -16°C
(3°F)		 -9°C
(15°F)		 -3°C
(26°F)		 5°C
(42°F)		 13°C
(57°F)		 17°C
(62°F)		 14°C
(58°F)		 9°C
(48°F)		 -2°C
(28°F)		 -8°C
(17°F)		 -11°C
(12°F)
Minimum -22°C
(-8°F)		 -24°C
(-11°F)		 -20°C
(-3°F)		 -8°C
(17°F)		 3°C
(38°F)		 11°C
(52°F)		 15°C
(59°F)		 12°C
(55°F)		 6°C
(42°F)		 -4°C
(25°F)		 -13°C
(8°F)		 -17°C
(1°F)

Compare climate in Riley with other places

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

Monthly average precipitation in Riley, Kansas, United States §

Riley usually has the most precipitation in May, August and October, with an average of 10 rainy days and 134 mm (5.3 inches) of precipitation per month.The driest months in Riley are January, February and December. On average, 28 mm (1.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Riley, Kansas, 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) 30 (1.2) 28 (1.1) 84 (3.3) 67 (2.6) 185 (7.3) 79 (3.1) 80 (3.1) 119 (4.7) 64 (2.5) 98 (3.9) 33 (1.3) 27 (1.0)
Average precipitation days (≥ 1 mm) 4 5 9 8 14 9 8 9 8 8 5 3

Monthly sunshine hours in Riley, Kansas, United States §

The sunniest months in Riley are June, July and August, when the sun shines an average of 11 hours 27 minutes a day.Least sunny months in Riley: January, February and November receive an average of 6 hours 46 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Riley, Kansas, 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 167 214 231 272 284 355 372 326 284 251 226 231
Mean daily daylight hours 9h 44m 10h 43m 11h 58m 13h 15m 14h 20m 14h 52m 14h 34m 13h 37m 12h 23m 11h 6m 9h 59m 9h 26m

Solar UV radiation in Riley, Kansas, United States §

Riley experiences the highest level of ultraviolet (UV) radiation in June, July and August, 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 Riley UV Index data.

Average daily maximum UV levels by month for Riley, Kansas, 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 9 10 11 11 10 9 6 4 3