Waltham, IL
Unincorporated community in LaSalle County, Illinois
Waltham is a small unincorporated community in LaSalle County, Illinois. It is 4.3 miles NW of Troy Grove, the nearest town. Its ZIP code is 61373.
Waltham at a glance
- State
- Illinois
- County
- LaSalle County
- ZIP code
- 61373
- Nearest town
- Troy Grove (4.3 mi)
- Time zone
- America/Chicago
- Coordinates
- 41.4333, -89.0103
Weather in Waltham now
Loading the National Weather Service forecast…
Waltham weather by the hour
Waltham weather for the next 7 days
Source: National Weather Service (NOAA) · forecast for the coordinates of Waltham.
This week in Waltham
Sunrise, sunset and moon in Waltham
What is the weather usually like in Waltham?
Köppen climate classification, calculated from the 1991–2020 normals
- Julywarmest month · 84°F average high
- Januarycoldest month · 14°F average low
- 38.0 inprecipitation per year · 966 mm
- 28.5 insnowfall per year · 72 cm
Average high and low temperature (°F)
Average precipitation (inches)
Best time to visit Waltham: May–June and August–September, with mild temperatures and fewer rainy days.
Source: NOAA NCEI U.S. Climate Normals 1991–2020, station PERU, IL US (USC00116753), adjusted for the elevation of Waltham.
Waltham weather month by month
Sunrise and sunset in Waltham through the year
| Month | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 7:18 AM | 4:52 PM | 9 h 34 min |
| February | 6:49 AM | 5:31 PM | 10 h 42 min |
| March | 7:05 AM | 7:03 PM | 11 h 58 min |
| April | 6:14 AM | 7:37 PM | 13 h 23 min |
| May | 5:35 AM | 8:09 PM | 14 h 34 min |
| June | 5:20 AM | 8:33 PM | 15 h 12 min |
| July | 5:34 AM | 8:29 PM | 14 h 55 min |
| August | 6:03 AM | 7:57 PM | 13 h 53 min |
| September | 6:35 AM | 7:06 PM | 12 h 31 min |
| October | 7:06 AM | 6:16 PM | 11 h 9 min |
| November | 6:43 AM | 4:37 PM | 9 h 54 min |
| December | 7:13 AM | 4:28 PM | 9 h 15 min |
Times for the 15th of each month, local time (America/Chicago).
What is the weather like in Waltham?
Waltham has a hot-summer humid continental climate. The warmest month is July, with an average high of 84°F (29°C), and the coldest is January, with average lows of 14°F (-10°C).
It gets about 38.0 inches (966 mm) of precipitation a year. The wettest month is June and the driest is February. Snow is common: about 29 inches fall in an average year.
The best time to visit Waltham is May–June and August–September. 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 Waltham
The closest live webcam is DeKalb › North-west, 36.8 miles N of Waltham.
Webcams: Windy.com. Distances in a straight line from Waltham.
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Map of Waltham, IL
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Waltham Street View
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Open in Google Maps ›Towns near Waltham
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Questions about Waltham
Where is Waltham, IL?
Waltham is an unincorporated community in LaSalle County, Illinois, 4.3 miles NW of Troy Grove.
What county is Waltham in?
Waltham is in LaSalle County, Illinois.
What is the ZIP code of Waltham, IL?
The ZIP code for Waltham is 61373.
What is the nearest town to Waltham?
Troy Grove, 4.3 miles away.
Are there webcams near Waltham?
Yes. The closest is DeKalb › North-west, 36.8 miles away.
What is the hottest month in Waltham?
July, with an average high of 84°F (29°C).
What is the coldest month in Waltham?
January, with an average low of 14°F (-10°C).
How much does it rain in Waltham?
About 38.0 inches (966 mm) a year; the wettest month is June.
Does it snow in Waltham?
Yes, about 29 inches of snow fall in an average year.
When is the best time to visit Waltham?
May–June and August–September, when temperatures are most pleasant and rainy days are fewer.
What climate does Waltham have?
Hot-summer humid continental (Köppen Dfa).
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