CHICAGO - Weather History and Averages

Station: CHICAGO (2005 to 2025)
Country: US
State: IL
Latitude: 42.0
Longitude: -87.5

High Temperatures

On average, the day with the warmest high temperature in CHICAGO is July 19 at an average of 81.1 °F (27.3 °C).

On average, the day with the coldest high temperature in CHICAGO is January 20 at an average of 29.4 °F (-1.4 °C).

Records

The warmest recorded high temperature in CHICAGO was 98.8 °F (37.1 °C) on July 24 in the year 2005 at CHICAGO — Integrated Surface Dataset (ISD) station ID: 997338 .

The coldest recorded high temperature in CHICAGO was 1.2 °F (-17.1 °C) on January 31 in the year 2019 at CHICAGO — Integrated Surface Dataset (ISD) station ID: 997338 .

Low Temperatures

On average, the day with the warmest low temperature in CHICAGO is August 2 at an average of 71.6 °F (22.0 °C).

On average, the day with the coldest low temperature in CHICAGO is January 20 at an average of 18.9 °F (-7.3 °C).

Records

The warmest recorded low temperature in CHICAGO was 87.3 °F (30.7 °C) on July 21 in the year 2022 at CHICAGO — Integrated Surface Dataset (ISD) station ID: 997338 .

The coldest recorded low temperature in CHICAGO was -19.8 °F (-28.8 °C) on January 30 in the year 2019 at CHICAGO — Integrated Surface Dataset (ISD) station ID: 997338 .

When you are gardening in CHICAGO, consider the chance that the weather may freeze and harm your plants. There is a greater than 5% chance of temperatures dropping below freezing in 167 of 366 days per year in CHICAGO.

According to the USA National Weather Service:

Freeze occurs when the temperature drops to 32° Fahrenheit or lower. A freeze will result in significant damage to many unprotected plants, especially if the temperature remains at-or-below freezing for several hours.

Last freeze

In CHICAGO during the spring season, the average last freeze date is April 17. Expect^* the last freeze date after

April 16 in one of every two years (50%),
May 1 in one of every ten years (10%),
May 8 in one of every twenty years (5%),
May 20 in one of every hundred years (1%).

First freeze

In CHICAGO during the autumn (fall) season, the average first freeze date is November 1. Expect^* the first freeze date before

November 9 in one of every two years (50%),
October 28 in one of every ten years (10%),
October 23 in one of every twenty years (5%),
October 12 in one of every hundred years (1%).

Hard Freeze

According to the USA National Weather Service:

Hard freeze typically occurs when the temperature reaches 28° Fahrenheit or lower for at least an hour (or more). This usually means that most seasonal vegetation will be destroyed. In addition, there is a possibility of damage to unprotected outdoor plumbing/un-drained sprinkler systems etc.

Last hard freeze

In CHICAGO during the spring season, the average last hard freeze date is April 16. Expect^* the last hard freeze date after

April 3 in one of every two years (50%),
April 17 in one of every ten years (10%),
April 26 in one of every twenty years (5%),
May 3 in one of every hundred years (1%).

First hard freeze

In CHICAGO during the autumn (fall) season, the average first hard freeze date is November 7. Expect^* the first hard freeze date before

November 14 in one of every two years (50%),
November 2 in one of every ten years (10%),
October 31 in one of every twenty years (5%),
October 24 in one of every hundred years (1%).

Frost

Frost can happen at temperatures above freezing and damage delicate plants. According to the USA National Weather Service:

Frost occurs when there is a solid deposition of water vapor from the air. Frost will form when solid surfaces are cooled below the dew point. An air temperature range of 33°- 36° Fahrenheit (or colder), along with light winds, is usually needed to initiate frost formation. At least minor damage is possible to plants. One must keep in mind that frost is not guaranteed if the air is very dry and/or winds are roughly 8+ MPH.

Last frost

In CHICAGO during the spring season, the average last frost date is May 10. Expect^* the last frost date after

April 29 in one of every two years (50%),
May 16 in one of every ten years (10%),
May 20 in one of every twenty years (5%),
May 30 in one of every hundred years (1%).

First frost

In CHICAGO during the autumn (fall) season, the average frost date is October 31. Expect^* the first frost date before

October 30 in one of every two years (50%),
October 16 in one of every ten years (10%),
October 12 in one of every twenty years (5%),
October 5 in one of every hundred years (1%).

Details

If you would like to see the temperatures for specific days, you can click on the corresponding links below:

January
1	2	3	4	5	6	7
8	9	10	11	12	13	14
15	16	17	18	19	20	21
22	23	24	25	26	27	28
29	30	31

February
1	2	3	4	5	6	7
8	9	10	11	12	13	14
15	16	17	18	19	20	21
22	23	24	25	26	27	28
29

March
1	2	3	4	5	6	7
8	9	10	11	12	13	14
15	16	17	18	19	20	21
22	23	24	25	26	27	28
29	30	31

April
1	2	3	4	5	6	7
8	9	10	11	12	13	14
15	16	17	18	19	20	21
22	23	24	25	26	27	28
29	30

May
1	2	3	4	5	6	7
8	9	10	11	12	13	14
15	16	17	18	19	20	21
22	23	24	25	26	27	28
29	30	31

June
1	2	3	4	5	6	7
8	9	10	11	12	13	14
15	16	17	18	19	20	21
22	23	24	25	26	27	28
29	30

July
1	2	3	4	5	6	7
8	9	10	11	12	13	14
15	16	17	18	19	20	21
22	23	24	25	26	27	28
29	30	31

August
1	2	3	4	5	6	7
8	9	10	11	12	13	14
15	16	17	18	19	20	21
22	23	24	25	26	27	28
29	30	31

September
1	2	3	4	5	6	7
8	9	10	11	12	13	14
15	16	17	18	19	20	21
22	23	24	25	26	27	28
29	30

October
1	2	3	4	5	6	7
8	9	10	11	12	13	14
15	16	17	18	19	20	21
22	23	24	25	26	27	28
29	30	31

November
1	2	3	4	5	6	7
8	9	10	11	12	13	14
15	16	17	18	19	20	21
22	23	24	25	26	27	28
29	30

December
1	2	3	4	5	6	7
8	9	10	11	12	13	14
15	16	17	18	19	20	21
22	23	24	25	26	27	28
29	30	31