Last updated: May 6, 2024
Under the Köppen–Geiger climate classification Round Lake Heights features a humid continental climate (Dfa).Temperatures typically range between -4 °C (26 °F) and 22 °C (73 °F) through the year, but rarely can drop to -28 °C (-19 °F) or can rise to as high as 31 °C (89 °F).The average annual precipitation amounts to about 1046 mm (41.2 inches) and receives 131 rainy days on the 1 mm (0.04 inches) threshold annually.Round Lake Heights enjoys an average of 2981 hours of sunshine throughout the year, and daylight varies from 9 hours 6 minutes to 15 hours 13 minutes per day.
The warmest months in Round Lake Heights are July, August and September, with daily mean temperatures ranging from 19 to 22 °C (67 - 73 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -4 to 0 °C (26 - 33 °F) throughout the day. On average each year, Round Lake Heights experiences 39 days above 25 °C (77.0 °F) and 97 days below 0 °C (32.0 °F).
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Maximum | 11°C (52°F) | 15°C (59°F) | 20°C (68°F) | 22°C (71°F) | 25°C (77°F) | 29°C (84°F) | 31°C (89°F) | 31°C (88°F) | 29°C (84°F) | 27°C (80°F) | 20°C (68°F) | 17°C (63°F) |
Mean maximum | 8°C (47°F) | 10°C (51°F) | 15°C (59°F) | 20°C (68°F) | 24°C (75°F) | 27°C (80°F) | 30°C (86°F) | 29°C (85°F) | 28°C (83°F) | 25°C (77°F) | 15°C (60°F) | 13°C (55°F) |
Average high | -1°C (31°F) | 0°C (33°F) | 6°C (43°F) | 10°C (50°F) | 15°C (60°F) | 22°C (71°F) | 25°C (78°F) | 25°C (78°F) | 22°C (72°F) | 15°C (60°F) | 7°C (44°F) | 3°C (38°F) |
Daily mean | -4°C (26°F) | -3°C (27°F) | 2°C (36°F) | 6°C (44°F) | 12°C (54°F) | 18°C (66°F) | 22°C (73°F) | 22°C (72°F) | 19°C (67°F) | 12°C (54°F) | 4°C (39°F) | 0°C (33°F) |
Average low | -6°C (21°F) | -6°C (21°F) | -1°C (31°F) | 3°C (38°F) | 9°C (49°F) | 15°C (60°F) | 19°C (67°F) | 19°C (66°F) | 16°C (61°F) | 9°C (49°F) | 1°C (34°F) | -2°C (28°F) |
Mean minimum | -19°C (-2°F) | -19°C (-2°F) | -11°C (12°F) | -3°C (27°F) | 3°C (37°F) | 11°C (53°F) | 15°C (60°F) | 15°C (59°F) | 10°C (50°F) | 2°C (35°F) | -7°C (19°F) | -12°C (11°F) |
Minimum | -28°C (-18°F) | -28°C (-19°F) | -21°C (-6°F) | -7°C (20°F) | -0°C (32°F) | 9°C (48°F) | 13°C (56°F) | 13°C (56°F) | 6°C (43°F) | -1°C (31°F) | -12°C (10°F) | -19°C (-2°F) |
Compare temperature, precipitation, sunshine, UV index in Round Lake Heights, Illinois, United States with other places around the world.
Round Lake Heights usually has the most precipitation in April, May and October, with an average of 13 rainy days and 133 mm (5.2 inches) of precipitation per month.The driest months in Round Lake Heights are February, November and December. On average, 60 mm (2.4 inches) of precipitation falls during these months.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Average precipitation mm (inches) | 67 (2.7) | 65 (2.6) | 70 (2.8) | 113 (4.5) | 156 (6.1) | 100 (3.9) | 74 (2.9) | 72 (2.8) | 84 (3.3) | 130 (5.1) | 56 (2.2) | 58 (2.3) |
Average precipitation days (≥ 1 mm) | 9 | 11 | 10 | 13 | 14 | 12 | 11 | 11 | 10 | 13 | 9 | 8 |
The sunniest months in Round Lake Heights are June, July and August, when the sun shines an average of 11 hours 17 minutes a day.Least sunny months in Round Lake Heights: January, February and December receive an average of 5 hours 11 minutes of sunshine daily.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Mean monthly sunshine hours | 119 | 181 | 240 | 252 | 288 | 331 | 365 | 341 | 282 | 215 | 189 | 171 |
Mean daily daylight hours | 9h 27m | 10h 34m | 11h 58m | 13h 24m | 14h 36m | 15h 13m | 14h 53m | 13h 48m | 12h 25m | 11h 0m | 9h 45m | 9h 6m |
Round Lake Heights 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 Round Lake Heights UV Index data.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
UV Index (month maximum) | 2 | 4 | 6 | 8 | 9 | 10 | 10 | 9 | 8 | 5 | 3 | 2 |