Typical weather at station CHICAGO O'HARE INTERNATIONAL

• Integrated Surface Dataset (ISD) station ID: 725300

A Weather Bureau Army Navy (WBAN) station ID was found for this station. Older data may be available at the WBAN page.

• Country: US
• State: IL
• Latitude: 41.96
• Longitude: -87.932

High Temperatures

On average, the day with the warmest high temperature in CHICAGO O'HARE INTERNATIONAL is July 17 at an average of 86.2 °F (30.1 °C).

On average, the day with the coldest high temperature in CHICAGO O'HARE INTERNATIONAL is January 28 at an average of 31.0 °F (-0.5 °C).

Records

The warmest recorded high temperature in CHICAGO O'HARE INTERNATIONAL was 104.0 °F (40.0 °C) on June 21 in the year 1988 at CHICAGO O'HARE INTERNATIONAL — Integrated Surface Dataset (ISD) station ID: 725300 — Weather Bureau Army Navy (WBAN): 94846 .

The coldest recorded high temperature in CHICAGO O'HARE INTERNATIONAL was -14.1 °F (-25.6 °C) on January 10 in the year 1982 at CHICAGO O'HARE INTERNATIONAL — Integrated Surface Dataset (ISD) station ID: 725300 — Weather Bureau Army Navy (WBAN): 94846 .

Low Temperatures

On average, the day with the warmest low temperature in CHICAGO O'HARE INTERNATIONAL is July 19 at an average of 65.5 °F (18.6 °C).

On average, the day with the coldest low temperature in CHICAGO O'HARE INTERNATIONAL is January 17 at an average of 14.1 °F (-10.0 °C).

Records

The warmest recorded low temperature in CHICAGO O'HARE INTERNATIONAL was 86.4 °F (30.2 °C) on August 6 in the year 1947 at CHICAGO O'HARE INTERNATIONAL — Integrated Surface Dataset (ISD) station ID: 725300 — Weather Bureau Army Navy (WBAN): 94846 .

The coldest recorded low temperature in CHICAGO O'HARE INTERNATIONAL was -27.0 °F (-32.8 °C) on January 20 in the year 1985 at CHICAGO O'HARE INTERNATIONAL — Integrated Surface Dataset (ISD) station ID: 725300 — Weather Bureau Army Navy (WBAN): 94846 .

Freeze

When you are gardening in CHICAGO O'HARE INTERNATIONAL, 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 219 of 366 days per year in CHICAGO O'HARE INTERNATIONAL.

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 O'HARE INTERNATIONAL during the spring season, the average last freeze date is April 23. Expect^* the last freeze date after

• May 5 in one of every two years (50%),
• May 23 in one of every ten years (10%),
• May 28 in one of every twenty years (5%),
• June 3 in one of every hundred years (1%).

First freeze

In CHICAGO O'HARE INTERNATIONAL during the autumn (fall) season, the average first freeze date is October 16. Expect^* the first freeze date before

• October 10 in one of every two years (50%),
• September 27 in one of every ten years (10%),
• September 23 in one of every twenty years (5%),
• September 17 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 O'HARE INTERNATIONAL during the spring season, the average last hard freeze date is April 10. Expect^* the last hard freeze date after

• April 21 in one of every two years (50%),
• May 10 in one of every ten years (10%),
• May 18 in one of every twenty years (5%),
• May 28 in one of every hundred years (1%).

First hard freeze

In CHICAGO O'HARE INTERNATIONAL during the autumn (fall) season, the average first hard freeze date is November 2. Expect^* the first hard freeze date before

• October 21 in one of every two years (50%),
• October 4 in one of every ten years (10%),
• October 1 in one of every twenty years (5%),
• September 23 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 O'HARE INTERNATIONAL during the spring season, the average last frost date is May 6. Expect^* the last frost date after

• May 17 in one of every two years (50%),
• May 30 in one of every ten years (10%),
• June 4 in one of every twenty years (5%),
• June 15 in one of every hundred years (1%).

First frost

In CHICAGO O'HARE INTERNATIONAL during the autumn (fall) season, the average frost date is October 10. Expect^* the first frost date before

• October 2 in one of every two years (50%),
• September 21 in one of every ten years (10%),
• September 17 in one of every twenty years (5%),
• September 7 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: