St. Charles DNR Office Boat Launch Air Temperatures
Jan
| High: | 30 F° | (-1.3 C°) |
| Low: | 15 F° | (-9.7 C°) |
Feb
| High: | 33 F° | (0.3 C°) |
| Low: | 16 F° | (-9 C°) |
March
| High: | 43 F° | (6.2 C°) |
| Low: | 24 F° | (-4.5 C°) |
April
| High: | 57 F° | (13.7 C°) |
| Low: | 35 F° | (1.7 C°) |
May
| High: | 69 F° | (20.3 C°) |
| Low: | 45 F° | (7.3 C°) |
June
| High: | 78 F° | (25.8 C°) |
| Low: | 55 F° | (12.9 C°) |
July
| High: | 83 F° | (28.1 C°) |
| Low: | 59 F° | (15.1 C°) |
August
| High: | 80 F° | (26.6 C°) |
| Low: | 58 F° | (14.5 C°) |
Sept
| High: | 73 F° | (22.7 C°) |
| Low: | 50 F° | (10.1 C°) |
Oct
| High: | 60 F° | (15.4 C°) |
| Low: | 39 F° | (4 C°) |
Nov
| High: | 47 F° | (8.1 C°) |
| Low: | 31 F° | (-0.8 C°) |
Dec
| High: | 34 F° | (1.2 C°) |
| Low: | 20 F° | (-6.5 C°) |