Last updated: March 2, 2024
Under the Köppen–Geiger climate classification Charles City features a humid continental climate (Dfa). Temperatures typically range between -7 °C (19 °F) and 23 °C (74 °F) through the year, but rarely can drop to -35 °C (-30 °F) or can rise to as high as 36 °C (97 °F). The average annual precipitation amounts to about 1041 mm (41.0 inches) and receives 109 rainy days on the 1 mm (0.04 inches) threshold annually. Charles City enjoys an average of 2910 hours of sunshine throughout the year, and daylight varies from 9 hours 3 minutes to 15 hours 16 minutes per day.
The warmest months in Charles City are June, July and August, with daily mean temperatures ranging from 21 to 23 °C (71 - 74 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -7 to -2 °C (19 - 28 °F) throughout the day. On average each year, Charles City experiences 80 days above 25 °C (77.0 °F) and 136 days below 0 °C (32.0 °F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum | 12°C (53°F) |
19°C (66°F) |
22°C (72°F) |
28°C (82°F) |
34°C (93°F) |
36°C (97°F) |
34°C (93°F) |
36°C (97°F) |
33°C (92°F) |
31°C (87°F) |
24°C (76°F) |
21°C (70°F) |
| Mean maximum | 9°C (48°F) |
11°C (52°F) |
18°C (65°F) |
25°C (77°F) |
31°C (89°F) |
33°C (91°F) |
33°C (91°F) |
32°C (89°F) |
32°C (89°F) |
29°C (84°F) |
17°C (64°F) |
15°C (58°F) |
| Average high | -3°C (27°F) |
-3°C (27°F) |
7°C (44°F) |
13°C (56°F) |
21°C (70°F) |
27°C (81°F) |
28°C (83°F) |
27°C (80°F) |
24°C (76°F) |
15°C (59°F) |
7°C (44°F) |
2°C (36°F) |
| Daily mean | -7°C (19°F) |
-7°C (19°F) |
2°C (36°F) |
8°C (46°F) |
16°C (60°F) |
22°C (72°F) |
23°C (74°F) |
21°C (71°F) |
19°C (66°F) |
10°C (50°F) |
2°C (35°F) |
-2°C (28°F) |
| Average low | -11°C (12°F) |
-12°C (11°F) |
-3°C (28°F) |
2°C (36°F) |
10°C (51°F) |
17°C (63°F) |
18°C (65°F) |
16°C (61°F) |
13°C (56°F) |
5°C (42°F) |
-3°C (27°F) |
-6°C (21°F) |
| Mean minimum | -25°C (-13°F) |
-25°C (-13°F) |
-16°C (4°F) |
-7°C (19°F) |
2°C (36°F) |
10°C (51°F) |
13°C (56°F) |
11°C (51°F) |
5°C (42°F) |
-5°C (24°F) |
-12°C (10°F) |
-17°C (1°F) |
| Minimum | -34°C (-29°F) |
-35°C (-30°F) |
-24°C (-11°F) |
-13°C (10°F) |
-1°C (30°F) |
8°C (47°F) |
11°C (52°F) |
10°C (50°F) |
2°C (36°F) |
-8°C (19°F) |
-17°C (2°F) |
-22°C (-7°F) |
Compare temperature, precipitation, sunshine, UV index in Charles City, Iowa, United States with other places around the world.
Charles City usually has the most precipitation in May, June and October, with an average of 12 rainy days and 137 mm (5.4 inches) of precipitation per month. The driest months in Charles City are January, February and December. On average, 41 mm (1.6 inches) of precipitation falls during these months.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average precipitation mm (inches) | 38 (1.5) | 48 (1.9) | 72 (2.8) | 74 (2.9) | 159 (6.3) | 123 (4.8) | 91 (3.6) | 116 (4.6) | 105 (4.1) | 128 (5.0) | 49 (1.9) | 37 (1.4) |
| Average precipitation days (≥ 1 mm) | 6 | 8 | 8 | 9 | 14 | 13 | 10 | 9 | 10 | 10 | 7 | 5 |
The sunniest months in Charles City are June, July and August, when the sun shines an average of 11 hours 6 minutes a day. Least sunny months in Charles City: January, November and December receive an average of 5 hours 34 minutes of sunshine daily.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean monthly sunshine hours | 132 | 194 | 225 | 234 | 256 | 335 | 364 | 322 | 256 | 207 | 194 | 185 |
| Mean daily daylight hours | 9h 25m | 10h 32m | 11h 58m | 13h 25m | 14h 39m | 15h 16m | 14h 56m | 13h 50m | 12h 26m | 10h 59m | 9h 42m | 9h 3m |
Charles City experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 9 - 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 3. For more detailed information, check out our hourly Charles City UV Index data.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV Index (month maximum) | 3 | 5 | 5 | 8 | 9 | 11 | 10 | 9 | 8 | 5 | 3 | 3 |
Discover in-depth weather details for every month in Charles City. Click through the links below for comprehensive overviews of temperature trends, precipitation levels, sunshine hours, and solar UV radiation specifics. Whether planning a visit or simply curious about Charles City's climate nuances, these monthly breakdowns provide the information you need for an informed understanding of what to expect throughout the year.
Each link leads to a detailed account of the typical weather conditions for that month, providing both locals and tourists with vital information to plan their daily activities, wardrobe, and travel itineraries accordingly.