Last updated: May 6, 2024
Under the Köppen–Geiger climate classification Waterloo features a humid continental climate (Dfb).Temperatures typically range between -3 °C (27 °F) and 24 °C (75 °F) through the year, but rarely can drop to -29 °C (-21 °F) or can rise to as high as 35 °C (95 °F).The average annual precipitation amounts to about 1140 mm (44.9 inches) and receives 136 rainy days on the 1 mm (0.04 inches) threshold annually.Waterloo enjoys an average of 2844 hours of sunshine throughout the year, and daylight varies from 9 hours 12 minutes to 15 hours 7 minutes per day.
The warmest months in Waterloo are June, July and August, with daily mean temperatures ranging from 22 to 24 °C (72 - 75 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -3 to 1 °C (27 - 34 °F) throughout the day. On average each year, Waterloo experiences 81 days above 25 °C (77.0 °F) and 104 days below 0 °C (32.0 °F).
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Maximum | 16°C (61°F) | 20°C (68°F) | 25°C (77°F) | 28°C (83°F) | 34°C (94°F) | 35°C (94°F) | 35°C (95°F) | 33°C (92°F) | 32°C (91°F) | 30°C (87°F) | 26°C (78°F) | 16°C (61°F) |
Mean maximum | 12°C (55°F) | 15°C (59°F) | 20°C (68°F) | 26°C (79°F) | 31°C (88°F) | 33°C (91°F) | 33°C (91°F) | 31°C (89°F) | 31°C (89°F) | 28°C (83°F) | 18°C (65°F) | 15°C (58°F) |
Average high | 1°C (34°F) | 2°C (37°F) | 9°C (48°F) | 14°C (58°F) | 21°C (70°F) | 27°C (80°F) | 28°C (83°F) | 27°C (81°F) | 25°C (77°F) | 17°C (64°F) | 8°C (47°F) | 5°C (40°F) |
Daily mean | -3°C (27°F) | -2°C (29°F) | 4°C (39°F) | 9°C (48°F) | 16°C (61°F) | 22°C (72°F) | 24°C (75°F) | 22°C (72°F) | 19°C (67°F) | 13°C (55°F) | 4°C (40°F) | 1°C (34°F) |
Average low | -6°C (22°F) | -6°C (22°F) | -1°C (31°F) | 4°C (40°F) | 11°C (53°F) | 17°C (63°F) | 19°C (67°F) | 18°C (64°F) | 14°C (58°F) | 8°C (47°F) | 0°C (33°F) | -3°C (27°F) |
Mean minimum | -18°C (-0°F) | -18°C (0°F) | -9°C (15°F) | -5°C (24°F) | 2°C (36°F) | 11°C (52°F) | 14°C (58°F) | 11°C (53°F) | 7°C (44°F) | -0°C (32°F) | -8°C (17°F) | -12°C (11°F) |
Minimum | -28°C (-18°F) | -29°C (-21°F) | -13°C (9°F) | -7°C (19°F) | -2°C (29°F) | 7°C (45°F) | 12°C (54°F) | 8°C (47°F) | 3°C (38°F) | -2°C (28°F) | -15°C (5°F) | -21°C (-6°F) |
Compare temperature, precipitation, sunshine, UV index in Waterloo, Indiana, United States with other places around the world.
Waterloo usually has the most precipitation in May, June and July, with an average of 13 rainy days and 125 mm (4.9 inches) of precipitation per month.The driest months in Waterloo are January, September and December. On average, 65 mm (2.6 inches) of precipitation falls during these months.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Average precipitation mm (inches) | 72 (2.8) | 75 (2.9) | 100 (3.9) | 102 (4.0) | 136 (5.4) | 124 (4.9) | 116 (4.6) | 101 (4.0) | 65 (2.5) | 110 (4.3) | 81 (3.2) | 60 (2.3) |
Average precipitation days (≥ 1 mm) | 8 | 11 | 12 | 14 | 15 | 13 | 11 | 11 | 9 | 13 | 10 | 9 |
The sunniest months in Waterloo are June, July and August, when the sun shines an average of 11 hours 0 minutes a day.Least sunny months in Waterloo: January, February and December receive an average of 4 hours 38 minutes of sunshine daily.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Mean monthly sunshine hours | 107 | 164 | 229 | 231 | 279 | 327 | 351 | 333 | 286 | 218 | 164 | 149 |
Mean daily daylight hours | 9h 32m | 10h 36m | 11h 58m | 13h 21m | 14h 32m | 15h 7m | 14h 48m | 13h 45m | 12h 25m | 11h 2m | 9h 49m | 9h 12m |
Waterloo experiences the highest level of ultraviolet (UV) radiation in April, June and July, 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 4. For more detailed information, check out our hourly Waterloo UV Index data.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
UV Index (month maximum) | 3 | 5 | 6 | 9 | 9 | 10 | 10 | 9 | 8 | 6 | 4 | 2 |