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Chicago Climate Guide
Illinois, United States
Metric | Imperial    Bars | Symbols
Maximum Daytime Temperature (°C)
Minimum Night-time Temperature (°C)
1
1 °C (34°F) Maximum Daytime Temperature in February
8
8 °C (46°F) Maximum Daytime Temperature in March
15
15 °C (59°F) Maximum Daytime Temperature in April
21
21 °C (70°F) Maximum Daytime Temperature in May
27
27 °C (81°F) Maximum Daytime Temperature in June
29
29 °C (84°F) Maximum Daytime Temperature in July
28
28 °C (82°F) Maximum Daytime Temperature in August
24
24 °C (75°F) Maximum Daytime Temperature in September
17
17 °C (63°F) Maximum Daytime Temperature in October
9
9 °C (48°F) Maximum Daytime Temperature in November
2
2 °C (36°F) Maximum Daytime Temperature in December
J F M A M J J A S O N D
4
4 °C (39°F) Minimum Night-time Temperature in April
9
9 °C (48°F) Minimum Night-time Temperature in May
14
14 °C (57°F) Minimum Night-time Temperature in June
17
17 °C (63°F) Minimum Night-time Temperature in July
16
16 °C (61°F) Minimum Night-time Temperature in August
12
12 °C (54°F) Minimum Night-time Temperature in September
6
6 °C (43°F) Minimum Night-time Temperature in October
0
0 °C (32°F) Minimum Night-time Temperature in November
J F M A M J J A S O N D
-1 °C (30°F) Maximum Daytime Temperature in January
-1
-10 °C (14°F) Minimum Night-time Temperature in January
-10
-8 °C (18°F) Minimum Night-time Temperature in February
-8
-2 °C (28°F) Minimum Night-time Temperature in March
-2
-7 °C (19°F) Minimum Night-time Temperature in December
-7
Hours of Sunshine
Hours of Daylight
4
4 Hours of Sunshine (45% of Daylight Hours) in January
5
5 Hours of Sunshine (46% of Daylight Hours) in February
6
6 Hours of Sunshine (50% of Daylight Hours) in March
7
7 Hours of Sunshine (55% of Daylight Hours) in April
9
9 Hours of Sunshine (63% of Daylight Hours) in May
10
10 Hours of Sunshine (68% of Daylight Hours) in June
10
10 Hours of Sunshine (69% of Daylight Hours) in July
9
9 Hours of Sunshine (67% of Daylight Hours) in August
8
8 Hours of Sunshine (61% of Daylight Hours) in September
6
6 Hours of Sunshine (56% of Daylight Hours) in October
4
4 Hours of Sunshine (39% of Daylight Hours) in November
3
3 Hours of Sunshine (37% of Daylight Hours) in December
J F M A M J J A S O N D
10
10 Hours of Daylight in January
11
11 Hours of Daylight in February
12
12 Hours of Daylight in March
13
13 Hours of Daylight in April
15
15 Hours of Daylight in May
15
15 Hours of Daylight in June
15
15 Hours of Daylight in July
14
14 Hours of Daylight in August
12
12 Hours of Daylight in September
11
11 Hours of Daylight in October
10
10 Hours of Daylight in November
9
9 Hours of Daylight in December
J F M A M J J A S O N D
Days with some Rain
Monthly Rainfall (mm)
12
12 Days with some Rain in January
10
10 Days with some Rain in February
12
12 Days with some Rain in March
12
12 Days with some Rain in April
11
11 Days with some Rain in May
10
10 Days with some Rain in June
10
10 Days with some Rain in July
9
9 Days with some Rain in August
9
9 Days with some Rain in September
9
9 Days with some Rain in October
11
11 Days with some Rain in November
12
12 Days with some Rain in December
J F M A M J J A S O N D
43
43 mm (1.7 inches) Monthly Rainfall in January
38
38 mm (1.5 inches) Monthly Rainfall in February
67
67 mm (2.6 inches) Monthly Rainfall in March
97
97 mm (3.8 inches) Monthly Rainfall in April
88
88 mm (3.5 inches) Monthly Rainfall in May
99
99 mm (3.9 inches) Monthly Rainfall in June
100
100 mm (3.9 inches) Monthly Rainfall in July
96
96 mm (3.8 inches) Monthly Rainfall in August
90
90 mm (3.5 inches) Monthly Rainfall in September
68
68 mm (2.7 inches) Monthly Rainfall in October
74
74 mm (2.9 inches) Monthly Rainfall in November
63
63 mm (2.5 inches) Monthly Rainfall in December
J F M A M J J A S O N D
Heat & Humidity / Chance of Frost
UV Index (Maximum)
29
29 Days with Frost in January
26
26 Days with Frost in February
21
21 Days with Frost in March
10
10 Days with Frost in April
-
No Heat & Humidity or Frost in May
L
Low Heat & Humidity in June
M
Moderate Heat & Humidity in July
M
Moderate Heat & Humidity in August
-
No Heat & Humidity or Frost in September
7
7 Days with Frost in October
17
17 Days with Frost in November
27
27 Days with Frost in December
J F M A M J J A S O N D
1
UV 1 (Low) in January
2
UV 2 (Low) in February
4
UV 4 (Moderate) in March
6
UV 6 (High) in April
7
UV 7 (High) in May
9
UV 9 (Very High) in June
9
UV 9 (Very High) in July
8
UV 8 (Very High) in August
6
UV 6 (High) in September
4
UV 4 (Moderate) in October
2
UV 2 (Low) in November
1
UV 1 (Low) in December
J F M A M J J A S O N D
Sea Temperature (°C)
4
4 °C (39°F) Sea Temperature in January
3
3 °C (37°F) Sea Temperature in February
3
3 °C (37°F) Sea Temperature in March
3
3 °C (37°F) Sea Temperature in April
6
6 °C (43°F) Sea Temperature in May
12
12 °C (54°F) Sea Temperature in June
19
19 °C (66°F) Sea Temperature in July
21
21 °C (70°F) Sea Temperature in August
19
19 °C (66°F) Sea Temperature in September
14
14 °C (57°F) Sea Temperature in October
9
9 °C (48°F) Sea Temperature in November
5
5 °C (41°F) Sea Temperature in December
J F M A M J J A S O N D
Chicago Climate Guide (Historical Weather Averages), Illinois, United States
Elev: 200 m   Long: 087°38'W   Lat: 41°49'N
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