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Monthly climate in Dubuque, Iowa, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Dubuque features a humid continental climate (Dfa).Temperatures typically range between -6 °C (22 °F) and 24 °C (76 °F) through the year, but rarely can drop to -33 °C (-27 °F) or can rise to as high as 35 °C (96 °F).The average annual precipitation amounts to about 1053 mm (41.4 inches) and receives 118 rainy days on the 1 mm (0.04 inches) threshold annually.Dubuque enjoys an average of 2972 hours of sunshine throughout the year, and daylight varies from 9 hours 6 minutes to 15 hours 13 minutes per day.

Monthly average temperatures in Dubuque, Iowa, United States §

The warmest months in Dubuque are June, July and August, with daily mean temperatures ranging from 22 to 24 °C (72 - 76 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -6 to -1 °C (22 - 30 °F) throughout the day. On average each year, Dubuque experiences 82 days above 25 °C (77.0 °F) and 120 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Dubuque, 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 10°C
(51°F)		 21°C
(70°F)		 23°C
(74°F)		 27°C
(81°F)		 34°C
(94°F)		 34°C
(93°F)		 35°C
(96°F)		 33°C
(92°F)		 33°C
(92°F)		 30°C
(87°F)		 22°C
(73°F)		 20°C
(69°F)
Mean maximum 7°C
(45°F)		 11°C
(52°F)		 18°C
(65°F)		 25°C
(78°F)		 31°C
(88°F)		 32°C
(90°F)		 33°C
(92°F)		 31°C
(89°F)		 31°C
(88°F)		 29°C
(84°F)		 17°C
(63°F)		 14°C
(58°F)
Average high -2°C
(28°F)		 -1°C
(31°F)		 7°C
(46°F)		 13°C
(56°F)		 21°C
(70°F)		 27°C
(81°F)		 29°C
(84°F)		 27°C
(81°F)		 24°C
(76°F)		 16°C
(60°F)		 7°C
(44°F)		 3°C
(37°F)
Daily mean -6°C
(22°F)		 -5°C
(23°F)		 3°C
(37°F)		 8°C
(47°F)		 16°C
(61°F)		 22°C
(72°F)		 24°C
(76°F)		 22°C
(72°F)		 19°C
(66°F)		 11°C
(52°F)		 3°C
(37°F)		 -1°C
(30°F)
Average low -10°C
(15°F)		 -10°C
(15°F)		 -1°C
(30°F)		 4°C
(39°F)		 11°C
(53°F)		 17°C
(63°F)		 20°C
(68°F)		 17°C
(63°F)		 14°C
(57°F)		 7°C
(44°F)		 -1°C
(30°F)		 -5°C
(24°F)
Mean minimum -24°C
(-11°F)		 -24°C
(-10°F)		 -14°C
(8°F)		 -4°C
(25°F)		 3°C
(37°F)		 12°C
(55°F)		 15°C
(60°F)		 12°C
(55°F)		 7°C
(45°F)		 -2°C
(28°F)		 -10°C
(15°F)		 -15°C
(6°F)
Minimum -32°C
(-26°F)		 -33°C
(-27°F)		 -24°C
(-11°F)		 -8°C
(18°F)		 -0°C
(32°F)		 9°C
(49°F)		 13°C
(56°F)		 12°C
(54°F)		 4°C
(39°F)		 -5°C
(24°F)		 -16°C
(4°F)		 -22°C
(-6°F)

Compare climate in Dubuque with other places

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

Monthly average precipitation in Dubuque, Iowa, United States §

Dubuque usually has the most precipitation in May, June and October, with an average of 12 rainy days and 135 mm (5.3 inches) of precipitation per month.The driest months in Dubuque are January, November and December. On average, 46 mm (1.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Dubuque, 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) 48 (1.9) 61 (2.4) 64 (2.5) 86 (3.4) 150 (5.9) 136 (5.4) 92 (3.6) 89 (3.5) 118 (4.7) 119 (4.7) 46 (1.8) 43 (1.7)
Average precipitation days (≥ 1 mm) 8 8 9 11 14 12 12 10 10 11 7 6

Monthly sunshine hours in Dubuque, Iowa, United States §

The sunniest months in Dubuque are June, July and August, when the sun shines an average of 11 hours 9 minutes a day.Least sunny months in Dubuque: January, February and December receive an average of 5 hours 42 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Dubuque, 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 133 193 233 241 263 330 362 334 272 215 200 191
Mean daily daylight hours 9h 27m 10h 33m 11h 58m 13h 24m 14h 37m 15h 13m 14h 53m 13h 48m 12h 25m 11h 0m 9h 44m 9h 6m

Solar UV radiation in Dubuque, Iowa, United States §

Dubuque experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 9 - 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 3. For more detailed information, check out our hourly Dubuque UV Index data.

Average daily maximum UV levels by month for Dubuque, 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 4 6 8 9 10 10 9 8 5 3 2