Boulder, IL
Unincorporated community in Bond County, Illinois
Boulder is a small unincorporated community in Bond County, Illinois. It is 4.3 miles NW of Keyesport, the nearest town. Its ZIP code is 62231.
Boulder at a glance
- State
- Illinois
- County
- Bond County
- ZIP code
- 62231
- Nearest town
- Keyesport (4.3 mi)
- Time zone
- America/Chicago
- Coordinates
- 38.6967, -89.2256
Weather in Boulder now
Loading the National Weather Service forecast…
Boulder weather by the hour
Boulder weather for the next 7 days
Source: National Weather Service (NOAA) · forecast for the coordinates of Boulder.
This week in Boulder
Sunrise, sunset and moon in Boulder
What is the weather usually like in Boulder?
Köppen climate classification, calculated from the 1991–2020 normals
- Julywarmest month · 88°F average high
- Januarycoldest month · 22°F average low
- 45.9 inprecipitation per year · 1,165 mm
Average high and low temperature (°F)
Average precipitation (inches)
Best time to visit Boulder: May and August to October, with mild temperatures and fewer rainy days.
Source: NOAA NCEI U.S. Climate Normals 1991–2020, station CARLYLE RSVR, IL US (USC00111290), adjusted for the elevation of Boulder.
Boulder weather month by month
Sunrise and sunset in Boulder through the year
| Month | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 7:11 AM | 5:01 PM | 9 h 49 min |
| February | 6:45 AM | 5:35 PM | 10 h 50 min |
| March | 7:06 AM | 7:05 PM | 11 h 58 min |
| April | 6:18 AM | 7:35 PM | 13 h 16 min |
| May | 5:43 AM | 8:03 PM | 14 h 20 min |
| June | 5:30 AM | 8:24 PM | 14 h 54 min |
| July | 5:43 AM | 8:22 PM | 14 h 39 min |
| August | 6:09 AM | 7:52 PM | 13 h 43 min |
| September | 6:37 AM | 7:06 PM | 12 h 29 min |
| October | 7:05 AM | 6:20 PM | 11 h 15 min |
| November | 6:37 AM | 4:45 PM | 10 h 7 min |
| December | 7:06 AM | 4:37 PM | 9 h 31 min |
Times for the 15th of each month, local time (America/Chicago).
What is the weather like in Boulder?
Boulder has a hot-summer humid continental climate. The warmest month is July, with an average high of 88°F (31°C), and the coldest is January, with average lows of 22°F (-6°C).
It gets about 45.9 inches (1,165 mm) of precipitation a year. The wettest month is May and the driest is February.
The best time to visit Boulder is May and August to October. The live forecast on this page comes from the National Weather Service and the climate averages from NOAA’s 1991–2020 U.S. Climate Normals.
Webcams near Boulder
The closest live webcam is Edwardsville › North-east: Redwood Drive, 38.4 miles W of Boulder.
Webcams: Windy.com. Distances in a straight line from Boulder.
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Map of Boulder, IL
Tap any road on the map to see it in Street View below. Map: © OpenStreetMap contributors.
Boulder Street View
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Other communities near Boulder
Questions about Boulder
Where is Boulder, IL?
Boulder is an unincorporated community in Bond County, Illinois, 4.3 miles NW of Keyesport.
What county is Boulder in?
Boulder is in Bond County, Illinois.
What is the ZIP code of Boulder, IL?
The ZIP code for Boulder is 62231.
What is the nearest town to Boulder?
Keyesport, 4.3 miles away.
Are there webcams near Boulder?
Yes. The closest is Edwardsville › North-east: Redwood Drive, 38.4 miles away.
What is the hottest month in Boulder?
July, with an average high of 88°F (31°C).
What is the coldest month in Boulder?
January, with an average low of 22°F (-6°C).
How much does it rain in Boulder?
About 45.9 inches (1,165 mm) a year; the wettest month is May.
Does it snow in Boulder?
Snow is very rare or not recorded at the nearest weather station.
When is the best time to visit Boulder?
May and August to October, when temperatures are most pleasant and rainy days are fewer.
What climate does Boulder have?
Hot-summer humid continental (Köppen Dfa).
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