February 18 - WAUKEGAN HARBOR - Weather History and Averages

Station: WAUKEGAN HARBOR (2006 to 2025)
Country: US
State: IL
Latitude: 42.35
Longitude: -87.82

High Temperatures

On February 18 in WAUKEGAN HARBOR the average high temperature is 35.1 °F (1.7 °C). The lowest recored high temperature was 9.0 °F (-12.8 °C) in 2025 and the highest recored high temperature was 64.4 °F (18.0 °C) in 2017. The high temperature is usually^* between 25.7 °F (-3.5 °C) and 44.6 °F (7.0 °C). About a quarter of the time, the high temperature is less than 25.7 °F (-3.5 °C), and another quarter of the time, the high temperature is greater than and 44.6 °F (7.0 °C). About 95% of the time, the high temperature has been between 7.7 °F (-13.5 °C) and 62.5 °F (17.0 °C).

Low Temperatures

On February 18 in WAUKEGAN HARBOR the average low temperature is 20.2 °F (-6.6 °C). The lowest recored low temperature was -7.4 °F (-21.9 °C) in 2025 and the lowest recored low temperature was 45.5 °F (7.5 °C) in 2017. The low temperature is usually^* between 12.0 °F (-11.1 °C) and 28.4 °F (-2.0 °C). About a quarter of the time, the low temperature is less than 12.0 °F (-11.1 °C), and another quarter of the time, the low temperature is greater than and 28.4 °F (-2.0 °C). About 95% of the time, the low temperature has been between -3.5 °F (-19.7 °C) and 43.9 °F (6.6 °C).

Frost

On February 18 in WAUKEGAN HARBOR expect the temperatures to drop below freezing for a risk of frost about 83.5% of the time.

^{Usually* in this context means around 50% of the
time, assuming a normal distribution of values.}

Data Source(s)

The data used to compute the average high/low temperatures for this location were taken from the following stations:

WAUKEGAN HARBOR — Integrated Surface Dataset (ISD) station ID: 997735 — from year 2007 to 2025

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