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Waukegan, Illinois climate
Dfa Hot-summer humid continental
Waukegan has a strongly seasonal cool-temperate climate (Hot-summer humid continental, Köppen Dfa). The hottest month is July with an average daily high near 29°C, while the coldest is January averaging around −8°C at night. Around 820 mm of precipitation falls each year, peaking in June (101 mm) and easing off in February (33 mm).
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsWaukegan climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 0 | 2 | 8 | 15 | 21 | 26 | 29 | 28 | 24 | 17 | 9 | 3 |
| Avg temp (°C) | −4 | −2 | 4 | 9 | 15 | 21 | 24 | 23 | 19 | 12 | 5 | −1 |
| Avg low (°C) | −8 | −6 | −1 | 4 | 10 | 16 | 19 | 18 | 14 | 7 | 1 | −4 |
| Precipitation (mm) | 34 | 33 | 47 | 84 | 96 | 101 | 80 | 94 | 77 | 79 | 55 | 42 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 0 | 2 | 8 | 15 | 21 | 26 |
| Avg temp (°C) | −4 | −2 | 4 | 9 | 15 | 21 |
| Avg low (°C) | −8 | −6 | −1 | 4 | 10 | 16 |
| Precipitation (mm) | 34 | 33 | 47 | 84 | 96 | 101 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 28 | 24 | 17 | 9 | 3 |
| Avg temp (°C) | 24 | 23 | 19 | 12 | 5 | −1 |
| Avg low (°C) | 19 | 18 | 14 | 7 | 1 | −4 |
| Precipitation (mm) | 80 | 94 | 77 | 79 | 55 | 42 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 6 | 5 | 8 | 10 | 11 | 10 | 8 | 8 | 9 | 10 | 8 | 7 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.7 | 4 | 7 | 4 | 2 | — | 0.0 | — |
| Days with low ≤ 0°C (days) | 26 | 24 | 19 | 6 | 0.1 | — | — | — | 0.0 | 2 | 15 | 25 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 6 | 5 | 8 | 10 | 11 | 10 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.7 | 4 |
| Days with low ≤ 0°C (days) | 26 | 24 | 19 | 6 | 0.1 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 8 | 8 | 9 | 10 | 8 | 7 |
| Days with high ≥ 32°C (days) | 7 | 4 | 2 | — | 0.0 | — |
| Days with low ≤ 0°C (days) | — | — | 0.0 | 2 | 15 | 25 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 76 | 73 | 76 | 80 | 79 | 76 | 68 | 64 | 59 | 65 | 70 | 75 |
| Clear days (≤ 30% cloud) | 1 | 2 | 0.9 | 1 | 2 | 2 | 3 | 4 | 7 | 6 | 3 | 2 |
| Partly cloudy days (30–70%) | 9 | 9 | 10 | 7 | 7 | 8 | 11 | 12 | 10 | 9 | 9 | 8 |
| Cloudy days (≥ 70%) | 21 | 17 | 20 | 22 | 22 | 20 | 17 | 15 | 13 | 16 | 17 | 20 |
| Relative humidity (%) | 88 | 85 | 80 | 76 | 75 | 74 | 73 | 73 | 73 | 76 | 81 | 87 |
| Wind speed (mph) | 9.1 | 9.0 | 8.7 | 8.7 | 7.4 | 6.2 | 5.5 | 5.3 | 6.1 | 7.3 | 8.1 | 8.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 76 | 73 | 76 | 80 | 79 | 76 |
| Clear days (≤ 30% cloud) | 1 | 2 | 0.9 | 1 | 2 | 2 |
| Partly cloudy days (30–70%) | 9 | 9 | 10 | 7 | 7 | 8 |
| Cloudy days (≥ 70%) | 21 | 17 | 20 | 22 | 22 | 20 |
| Relative humidity (%) | 88 | 85 | 80 | 76 | 75 | 74 |
| Wind speed (mph) | 9.1 | 9.0 | 8.7 | 8.7 | 7.4 | 6.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 68 | 64 | 59 | 65 | 70 | 75 |
| Clear days (≤ 30% cloud) | 3 | 4 | 7 | 6 | 3 | 2 |
| Partly cloudy days (30–70%) | 11 | 12 | 10 | 9 | 9 | 8 |
| Cloudy days (≥ 70%) | 17 | 15 | 13 | 16 | 17 | 20 |
| Relative humidity (%) | 73 | 73 | 73 | 76 | 81 | 87 |
| Wind speed (mph) | 5.5 | 5.3 | 6.1 | 7.3 | 8.1 | 8.3 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Chicago Palwaukee AP (NOAA GHCN station USW00004838), about 27 km from the city centre.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.