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Monthly climate in Castalia, Ohio, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Castalia features a humid continental climate (Dfa).Temperatures typically range between -1 °C (30 °F) and 24 °C (76 °F) through the year, but rarely can drop to -21 °C (-6 °F) or can rise to as high as 32 °C (91 °F).The average annual precipitation amounts to about 1127 mm (44.4 inches) and receives 148 rainy days on the 1 mm (0.04 inches) threshold annually.Castalia enjoys an average of 2967 hours of sunshine throughout the year, and daylight varies from 9 hours 13 minutes to 15 hours 6 minutes per day.

Monthly average temperatures in Castalia, Ohio, United States §

The warmest months in Castalia are June, July and August, with daily mean temperatures ranging from 21 to 24 °C (71 - 76 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -1 to 2 °C (30 - 35 °F) throughout the day. On average each year, Castalia experiences 60 days above 25 °C (77.0 °F) and 76 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Castalia, Ohio, 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 15°C
(59°F)		 17°C
(63°F)		 18°C
(66°F)		 24°C
(76°F)		 29°C
(84°F)		 32°C
(90°F)		 32°C
(91°F)		 31°C
(89°F)		 31°C
(88°F)		 28°C
(83°F)		 21°C
(70°F)		 15°C
(59°F)
Mean maximum 11°C
(52°F)		 13°C
(55°F)		 17°C
(62°F)		 21°C
(71°F)		 27°C
(81°F)		 30°C
(87°F)		 31°C
(89°F)		 30°C
(86°F)		 29°C
(85°F)		 26°C
(79°F)		 17°C
(63°F)		 13°C
(56°F)
Average high 1°C
(35°F)		 2°C
(37°F)		 7°C
(44°F)		 12°C
(54°F)		 19°C
(66°F)		 24°C
(76°F)		 27°C
(81°F)		 26°C
(79°F)		 23°C
(74°F)		 17°C
(63°F)		 8°C
(47°F)		 4°C
(40°F)
Daily mean -1°C
(30°F)		 -1°C
(31°F)		 3°C
(39°F)		 9°C
(48°F)		 16°C
(60°F)		 21°C
(71°F)		 24°C
(76°F)		 23°C
(74°F)		 20°C
(69°F)		 14°C
(58°F)		 6°C
(42°F)		 2°C
(35°F)
Average low -4°C
(26°F)		 -3°C
(26°F)		 1°C
(34°F)		 6°C
(43°F)		 13°C
(55°F)		 19°C
(66°F)		 22°C
(72°F)		 21°C
(70°F)		 18°C
(64°F)		 12°C
(53°F)		 3°C
(38°F)		 -1°C
(31°F)
Mean minimum -14°C
(8°F)		 -13°C
(9°F)		 -7°C
(19°F)		 -0°C
(31°F)		 6°C
(42°F)		 14°C
(57°F)		 18°C
(66°F)		 17°C
(63°F)		 12°C
(54°F)		 5°C
(41°F)		 -3°C
(26°F)		 -8°C
(17°F)
Minimum -21°C
(-6°F)		 -21°C
(-6°F)		 -12°C
(11°F)		 -2°C
(28°F)		 1°C
(35°F)		 11°C
(52°F)		 17°C
(64°F)		 16°C
(61°F)		 10°C
(50°F)		 3°C
(38°F)		 -8°C
(18°F)		 -16°C
(4°F)

Compare climate in Castalia with other places

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

Monthly average precipitation in Castalia, Ohio, United States §

Castalia usually has the most precipitation in May, June and July, with an average of 13 rainy days and 118 mm (4.6 inches) of precipitation per month.The driest months in Castalia are January, September and December. On average, 73 mm (2.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Castalia, Ohio, 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) 76 (3.0) 83 (3.3) 87 (3.4) 106 (4.2) 124 (4.9) 108 (4.3) 121 (4.8) 82 (3.2) 70 (2.8) 99 (3.9) 98 (3.9) 72 (2.8)
Average precipitation days (≥ 1 mm) 10 13 12 14 14 12 13 13 9 15 11 12

Monthly sunshine hours in Castalia, Ohio, United States §

The sunniest months in Castalia are June, July and August, when the sun shines an average of 11 hours 17 minutes a day.Least sunny months in Castalia: January, February and December receive an average of 4 hours 42 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Castalia, Ohio, 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 112 166 244 248 295 340 362 335 295 235 180 148
Mean daily daylight hours 9h 33m 10h 37m 11h 58m 13h 21m 14h 31m 15h 6m 14h 47m 13h 44m 12h 25m 11h 2m 9h 50m 9h 13m

Solar UV radiation in Castalia, Ohio, United States §

Castalia 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, February 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 Castalia UV Index data.

Average daily maximum UV levels by month for Castalia, Ohio, 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 4 6 8 10 10 10 9 8 6 4 2