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Monthly climate in Herculaneum, Missouri, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Herculaneum features a humid subtropical climate (Cfa).Temperatures typically range between 1 °C (34 °F) and 26 °C (80 °F) through the year, but rarely can drop to -20 °C (-3 °F) or can rise to as high as 39 °C (102 °F).The average annual precipitation amounts to about 1181 mm (46.5 inches) and receives 123 rainy days on the 1 mm (0.04 inches) threshold annually.Herculaneum enjoys an average of 2989 hours of sunshine throughout the year, and daylight varies from 9 hours 32 minutes to 14 hours 45 minutes per day.

Monthly average temperatures in Herculaneum, Missouri, United States §

The warmest months in Herculaneum are June, July and August, with daily mean temperatures ranging from 24 to 26 °C (76 - 80 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 1 to 4 °C (34 - 40 °F) throughout the day. On average each year, Herculaneum experiences 122 days above 25 °C (77.0 °F) and 72 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Herculaneum, Missouri, 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 20°C
(68°F)		 25°C
(78°F)		 28°C
(83°F)		 31°C
(89°F)		 33°C
(92°F)		 35°C
(96°F)		 39°C
(102°F)		 35°C
(96°F)		 35°C
(94°F)		 34°C
(94°F)		 26°C
(79°F)		 24°C
(76°F)
Mean maximum 17°C
(63°F)		 21°C
(71°F)		 25°C
(78°F)		 29°C
(84°F)		 32°C
(89°F)		 33°C
(92°F)		 36°C
(97°F)		 35°C
(95°F)		 34°C
(93°F)		 32°C
(90°F)		 23°C
(74°F)		 21°C
(70°F)
Average high 5°C
(41°F)		 8°C
(46°F)		 14°C
(58°F)		 18°C
(65°F)		 24°C
(76°F)		 30°C
(85°F)		 31°C
(89°F)		 30°C
(85°F)		 28°C
(83°F)		 21°C
(70°F)		 13°C
(55°F)		 10°C
(50°F)
Daily mean 1°C
(34°F)		 2°C
(37°F)		 9°C
(48°F)		 13°C
(56°F)		 19°C
(67°F)		 24°C
(76°F)		 26°C
(80°F)		 25°C
(76°F)		 22°C
(72°F)		 15°C
(59°F)		 7°C
(45°F)		 4°C
(40°F)
Average low -3°C
(27°F)		 -2°C
(28°F)		 4°C
(39°F)		 8°C
(46°F)		 15°C
(59°F)		 20°C
(68°F)		 22°C
(72°F)		 20°C
(68°F)		 17°C
(63°F)		 10°C
(50°F)		 2°C
(36°F)		 -0°C
(32°F)
Mean minimum -15°C
(6°F)		 -14°C
(7°F)		 -7°C
(19°F)		 -1°C
(31°F)		 7°C
(45°F)		 15°C
(59°F)		 17°C
(63°F)		 14°C
(58°F)		 9°C
(49°F)		 -0°C
(32°F)		 -7°C
(20°F)		 -10°C
(15°F)
Minimum -20°C
(-3°F)		 -20°C
(-3°F)		 -16°C
(3°F)		 -4°C
(25°F)		 4°C
(39°F)		 12°C
(53°F)		 16°C
(60°F)		 13°C
(55°F)		 8°C
(46°F)		 -3°C
(27°F)		 -12°C
(10°F)		 -15°C
(4°F)

Compare climate in Herculaneum with other places

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

Monthly average precipitation in Herculaneum, Missouri, United States §

Herculaneum usually has the most precipitation in March, April and May, with an average of 12 rainy days and 137 mm (5.4 inches) of precipitation per month.The driest months in Herculaneum are September, November and December. On average, 67 mm (2.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Herculaneum, Missouri, 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) 77 (3.0) 84 (3.3) 132 (5.2) 137 (5.4) 143 (5.6) 88 (3.5) 89 (3.5) 124 (4.9) 68 (2.7) 104 (4.1) 71 (2.8) 62 (2.5)
Average precipitation days (≥ 1 mm) 8 10 12 12 14 11 10 12 7 11 9 7

Monthly sunshine hours in Herculaneum, Missouri, United States §

The sunniest months in Herculaneum are June, July and August, when the sun shines an average of 10 hours 55 minutes a day.Least sunny months in Herculaneum: January, February and December receive an average of 5 hours 29 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Herculaneum, Missouri, 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 127 176 207 239 289 328 348 328 291 242 214 195
Mean daily daylight hours 9h 50m 10h 46m 11h 58m 13h 12m 14h 14m 14h 45m 14h 28m 13h 33m 12h 22m 11h 9m 10h 5m 9h 32m

Solar UV radiation in Herculaneum, Missouri, United States §

Herculaneum experiences the highest level of ultraviolet (UV) radiation in May, June 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, February and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly Herculaneum UV Index data.

Average daily maximum UV levels by month for Herculaneum, Missouri, 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 7 9 10 11 10 10 9 7 5 3