Cook County Klima and Average Vejr
Klima of Cook County: average temperatures, rainfall and seasons month by month.
Klima in Cook County month by month
Average high, average low and total rainfall, based on three years of reanalysis data.
| Måned | Avg high | Avg low | Regnfall | Rating |
|---|---|---|---|---|
| januar | -2° | -8° | 73 mm | ★★☆☆☆ |
| februar | 4° | -4° | 19 mm | ★★★☆☆ |
| marts | 11° | 1° | 103 mm | ★★★☆☆ |
| april | 15° | 6° | 113 mm | ★★★☆☆ |
| maj | 20° | 11° | 68 mm | ★★★★☆ |
| juni | 26° | 18° | 126 mm | ★★★★☆ |
| juli | 28° | 20° | 127 mm | ★★★★☆ |
| august | 27° | 19° | 87 mm | ★★★★☆ |
| september | 24° | 16° | 92 mm | ★★★★☆ |
| oktober | 18° | 10° | 79 mm | ★★★★☆ |
| november | 10° | 3° | 68 mm | ★★★☆☆ |
| december | 3° | -3° | 68 mm | ★★☆☆☆ |
Klima type: Kontinental. Kilde: Open-Meteo archive (ERA5).
Recent extremes in Cook County
Højest and lowest readings observed in the last 3 years of reanalysis data - not all-time records.
How Cook County compares med nearby places
Annual averages, and the difference against Cook County.
| Place | Distance | Avg temp | vs here | Annual rain |
|---|---|---|---|---|
| Area Code 312 | 0 km | 11°C | about the same | 1023 mm |
| Chicago | 0 km | 11°C | about the same | 1023 mm |
| The Loop | 1 km | 11°C | about the same | 1023 mm |
| ZIP Code 60601 | 1 km | 11°C | about the same | 1023 mm |
| Wicker Park | 5 km | 11°C | about the same | 984 mm |
Bedste rejsetid Cook County
Go in maj, juni, august, september and oktober. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: januar, februar and december - expect the least comfortable mix of heat, cold or rain.
What this means for Cook County
Today is warmer than average for september. The forecast high of 29°C is 5°C above the 24°C typical for this month.
A 47% chance means rain is likely somewhere nearby at some point - carry a layer, but do not cancel.
Vindstød og 56 km/h will push high-sided vehicles on exposed roads and bridges.
Northern Hemisphere, so peak summer falls in juni og august.
The gap between the warmest and coldest month averages 29°C.
What og pack, what og skip
- Lightweight, light-coloured clothing and a refillable water bottle
- sønglasses, a brimmed hat and SPF 30+
- A packable rain shell - 4 of the next 7 days carry a real chance of rain
- Avoid exposed ridgelines, small boats and rooftop viewpoints while gusts stay above 56 km/h.
- If your dates are flexible, avoid januar, februar and december - historically the least comfortable months here.
Resumé
Cook County is a county in Illinois. Cook County is a county in the United States. Der bor omkring 5.1 million.
Lige nu er det 23°C (74°F) in Cook County med overskyet. Det føles som 26°C. I dag ligger temperaturen mellem 17°C og 29°C. Sandsynligheden for nedbør er 47%. Sightseeing conditions score 8.5/10 - fremragende — tag af sted nu.
Det bedste tidspunkt at besøge Cook County is maj, juni, august, september and oktober. Klimaet er continental. januar, februar and december tend og be the least comfortable months. juli is the warmest month med average highs near 28°C, while januar is the coldest med lows near -8°C.
The closest major airport is O'Hare International Airport (ORD), about 25 km away. Nearby highlights include Indiana Dunes National Park, Starved Rock State Park and Lake Michigan.
Kort sagt. Today is warmer than average for september. The forecast high of 29°C is 5°C above the 24°C typical for this month. The best window og be outside is roughly 8 AM og 11 AM, when temperature, rain chance and wind line up best. fishing is the strongest bet in Cook County today at 9.4/10. Vindstød og 56 km/h will push high-sided vehicles on exposed roads and bridges.
Compiled from this page's own data: atlas facts plus live Open-Meteo readings.
Quick facts about Cook County
| Type | County |
|---|---|
| State | Illinois |
| Land | USA |
| Kontinent | Nordamerika |
| Koordinater | 41°52′41.2″N 87°37′47.3″W (41.8781, -87.6298) |
| Befolkning | 5.100.000 |
| Lokal tid | 7:53 PM (UTC-05:00) |
| Best months | maj, juni, august, september and oktober |
| Klima | Kontinental |
Vejr map for Cook County
Animated model layers. Pick a layer og load it.
Animated layers by Vindy. For pin-level detail and nearby places, see the interactive map below.
Explore Cook County
Every topic we hold for this place, and the same topic for the places around it.
Klima for related places
Frequently asked questions
Where is Cook County?
Cook County is a county in Illinois. Its coordinates are 41.8781, -87.6298. It lies in Nordamerika.
What is the weather like in Cook County lige nu?
It is currently 23°C (74°F) med overskyet. Luftfugtighed is 85% and wind is 10 km/h.
When is the best time og visit Cook County?
maj, juni, august, september and oktober offer the most comfortable conditions in Cook County, which has a continental climate. januar, februar and december are usually the hardest months for outdoor plans.
What time zone is Cook County in?
Cook County observes America/Chicago (UTC-05:00). The local time is 7:53 PM.
How many people live in Cook County?
Cook County has a population of approximately 5.1 million.
What is the nearest airport og Cook County?
The closest airports are O'Hare International Airport (ORD), 25 km away.
What are the top things og do in Cook County?
Popular options include Indiana Dunes National Park, Starved Rock State Park and Lake Michigan.
Related articles
Data sources and methodology
| Place data | USPOTUS Atlas dataset (us-counties) - coordinates, hierarchy and facts. |
|---|---|
| Prognose and observations | Open-Meteo (ECMWF and national models). |
| Luftkvalitet and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Klima averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Official alerts | US National Vejr Service. |
| Method | Scores, comparisons and advice on this page are computed from the inputs above. Distances are straight-line. Nothing is estimated where data is missing - the block is simply not shown. |
Last updated september 15, 2026 at 7:53 PM local time. Live blocks refresh every 15 minutes; climate averages monthly.
