Average humidity in Alton (IL)
On this page you find more information about the monthly relative humidity over the year in Alton (Illinois), the United States of America.
Alton shows variation in the level of humidity throughout the year. The highest humidity is noted duing December, it reaches up to 74%, which is categorized as high. On the other hand, the lowest humidity is recorded in April, with levels falling to 63%.
The average humidity in Alton is approximately 69%, which is high.
Humidity is an essential factor in how you experience temperature. During the warmest month, July, the temperature is around 31°C. When this period is accompanied by high humidity, it results in a higher perceived temperature. This can cause greater discomfort, while in winter it can make the air feel much colder, adding to the cooler temperatures. Check out our detailed temperature page for more information.
Forecast for Alton (IL)
Thu Dec 26
13°C | 7°C
SE 
6 m/s
6 m/s0.5 mm
partly cloudy and chance of slight rain
Fri Dec 27
12°C | 8°C
SE 6 m/s
6 m/s4.7 mm
overcast and rain
Sat Dec 28
15°C | 7°C
S 3 m/s
3 m/s
broken clouds and no rain
