Cook County Klima and Average Vær
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 | ★★★☆☆ |
| mars | 11° | 1° | 103 mm | ★★★☆☆ |
| april | 15° | 6° | 113 mm | ★★★☆☆ |
| mai | 20° | 11° | 68 mm | ★★★★☆ |
| juni | 26° | 18° | 126 mm | ★★★★☆ |
| juli | 28° | 20° | 127 mm | ★★★★☆ |
| august | 27° | 19° | 116 mm | ★★★★☆ |
| september | 24° | 17° | 74 mm | ★★★★☆ |
| oktober | 18° | 10° | 79 mm | ★★★★☆ |
| november | 10° | 3° | 68 mm | ★★★☆☆ |
| desember | 3° | -3° | 68 mm | ★★☆☆☆ |
Klima type: Kontinental. Kilde: Open-Meteo archive (ERA5).
Recent extremes in Cook County
Høyest 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 | 1034 mm |
| Chicago | 0 km | 11°C | about the same | 1034 mm |
| The Loop | 1 km | 11°C | about the same | 1034 mm |
| ZIP Code 60601 | 1 km | 11°C | about the same | 1034 mm |
| Wicker Park | 5 km | 11°C | about the same | 996 mm |
Beste tid å besøke Cook County
Go in mai, juni, august, september and oktober. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: januar, februar and desember - expect the least comfortable mix of heat, cold or rain.
What this means for Cook County
Today is cooler than average for september. The forecast high of 18°C is 5.9°C below the 24°C typical for this month.
A 92% chance means rain is expected over most of the area. Plan indoor alternatives. Around 14 mm is forecast, which is enough til soak trails and slow traffic.
Wet roads are likely; braking distances roughly double in heavy rain.
Northern Hemisphere, so peak summer falls in juni til august.
The gap between the warmest and coldest month averages 29°C.
What til pack, what til skip
- Layers - the daily swing is 13°C, so mornings feel nothing like afternoons
- A packable rain shell - 2 of the next 7 days carry a real chance of rain
- If your dates are flexible, avoid januar, februar and desember - historically the least comfortable months here.
Sammendrag
Cook County is a county in Illinois. Cook County is a county in the United States. Befolkningen er rundt 5.1 million.
Akkurat nå er det 17°C (63°F) in Cook County med light drizzle. Det føles som 18°C. I dag varierer temperaturen mellom 15°C til 18°C. Sannsynligheten for nedbør er 92%. Sightseeing conditions score 7.3/10 - gode forhold.
Beste tidspunkt å besøke Cook County is mai, juni, august, september and oktober. Klimaet er continental. januar, februar and desember tend til 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 cooler than average for september. The forecast high of 18°C is 5.9°C below the 24°C typical for this month. The best window til be outside is roughly 9 AM til 12 PM, when temperature, rain chance and wind line up best. fishing is the strongest bet in Cook County today at 9.4/10. Wet roads are likely; braking distances roughly double in heavy rain.
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 | Nord-Amerika |
| Koordinater | 41°52′41.2″N 87°37′47.3″W (41.8781, -87.6298) |
| Befolkning | 5.100.000 |
| Lokal tid | 7:04 PM (UTC-05:00) |
| Best months | mai, juni, august, september and oktober |
| Klima | Kontinental |
Vær map for Cook County
Animated model layers. Pick a layer til 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 Nord-Amerika.
What is the weather like in Cook County akkurat nå?
It is currently 17°C (63°F) med light drizzle. Luftfuktighet is 94% and wind is 10 km/h.
When is the best time til visit Cook County?
mai, juni, august, september and oktober offer the most comfortable conditions in Cook County, which has a continental climate. januar, februar and desember 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 7:04 PM.
How many people live in Cook County?
Cook County has a population of approximately 5.1 million.
What is the nearest airport til Cook County?
The closest airports are O'Hare International Airport (ORD), 25 km away.
What are the top things til 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. |
|---|---|
| Værmelding 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 Vær 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 30, 2026 at 7:04 PM local time. Live blocks refresh every 15 minutes; climate averages monthly.
