Typical weather at station NORTHERLY ISLAND

Station information

• Integrated Surface Dataset (ISD) station ID: 998499
• Country: US
• State: IL
• Latitude: 41.856
• Longitude: -87.609

High Temperatures

On average, the day with the warmest high temperature in NORTHERLY ISLAND is July 6 at an average of 84.6 °F (29.2 °C).

On average, the day with the coldest high temperature in NORTHERLY ISLAND is January 7 at an average of 30.9 °F (-0.6 °C).

Records

The warmest recorded high temperature in NORTHERLY ISLAND was 98.6 °F (37.0 °C) on July 25 in the year 2012 at NORTHERLY ISLAND — Integrated Surface Dataset (ISD) station ID: 998499 .

The coldest recorded high temperature in NORTHERLY ISLAND was -1.5 °F (-18.6 °C) on January 31 in the year 2019 at NORTHERLY ISLAND — Integrated Surface Dataset (ISD) station ID: 998499 .

Low Temperatures

On average, the day with the warmest low temperature in NORTHERLY ISLAND is July 20 at an average of 69.8 °F (21.0 °C).

On average, the day with the coldest low temperature in NORTHERLY ISLAND is January 21 at an average of 16.4 °F (-8.7 °C).

Records

The warmest recorded low temperature in NORTHERLY ISLAND was 85.5 °F (29.7 °C) on July 21 in the year 2022 at NORTHERLY ISLAND — Integrated Surface Dataset (ISD) station ID: 998499 .

The coldest recorded low temperature in NORTHERLY ISLAND was -20.9 °F (-29.4 °C) on January 31 in the year 2019 at NORTHERLY ISLAND — Integrated Surface Dataset (ISD) station ID: 998499 .

Freeze

When you are gardening in NORTHERLY ISLAND, 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 173 of 366 days per year in NORTHERLY ISLAND.

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 NORTHERLY ISLAND during the spring season, the average last freeze date is March 30. Expect^* the last freeze date after

• April 16 in one of every two years (50%),
• April 30 in one of every ten years (10%),
• May 8 in one of every twenty years (5%),
• May 16 in one of every hundred years (1%).

First freeze

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

• November 1 in one of every two years (50%),
• October 23 in one of every ten years (10%),
• October 18 in one of every twenty years (5%),
• October 8 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 NORTHERLY ISLAND during the spring season, the average last hard freeze date is March 30. Expect^* the last hard freeze date after

• April 4 in one of every two years (50%),
• April 17 in one of every ten years (10%),
• April 19 in one of every twenty years (5%),
• May 1 in one of every hundred years (1%).

First hard freeze

In NORTHERLY ISLAND during the autumn (fall) season, the average first hard freeze date is November 13. Expect^* the first hard freeze date before

• November 11 in one of every two years (50%),
• October 31 in one of every ten years (10%),
• October 29 in one of every twenty years (5%),
• October 18 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 NORTHERLY ISLAND during the spring season, the average last frost date is April 23. Expect^* the last frost date after

• April 29 in one of every two years (50%),
• May 14 in one of every ten years (10%),
• May 18 in one of every twenty years (5%),
• May 23 in one of every hundred years (1%).

First frost

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

• October 26 in one of every two years (50%),
• October 13 in one of every ten years (10%),
• October 8 in one of every twenty years (5%),
• October 4 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: