Contents
- Weather in October
- Frequently asked questions
- Average temperature in October
- Average pressure in October
- Average wind speed in October
- Average humidity in October
- Average rainfall in October
- Average rainfall days in October
- Average snowfall in October
- Average snowfall days in October
- Average daylight in October
- Average sunshine in October
- Average sunshine days in October
- Average UV index in October
- Average cloud cover in October
- Average visibility in October
Weather in October
Temperature
October comes with a decrease in the average high-temperature, falling from a moderately hot 78.6°F (25.9°C) in September to a comfortable 65.5°F (18.6°C). Alton records a mean low-temperature of 48.6°F (9.2°C) in October.Humidity
The least humid month is October, with an average relative humidity of 71%.Rainfall
In Alton, in October, during 9.4 rainfall days, 1.54" (39mm) of precipitation is typically accumulated. Throughout the year, in Alton, there are 128.3 rainfall days, and 18.9" (480mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall in Alton.Daylight
In Alton, the average length of the day in October is 11h and 10min.On the first day of October in Alton, sunrise is at 6:57 am and sunset at 6:42 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 6:00 pm CDT.
Sunshine
The average sunshine in October in Alton is 6.1h.UV index
In Alton, the average daily maximum UV index in October is 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: In October, the average maximum UV index of 3 translates into the following recommendations:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. To avoid the Sun's strongest rays, limit exposure around the mid-day period. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are October temperatures in Alton?
What is the least humid month in Alton?
What is the average humidity in October in Alton?
How many days does it rain in October in Alton?
When it does not snow in Alton?
Does it snow in Alton in October?
What is the average length of the day in October in Alton?
When are sunrise and sunset in October in Alton?
How long on average sun shines in October in Alton?
How high is the UV index in October in Alton?
Average temperature in October
Alton, IL
- Average high temperature in October: 65.5°F
The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is January (36.1°F).
- Average low temperature in October: 48.6°F
The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (23.2°F).
Average pressure in October
Alton, IL
- Average pressure in October: 30.03"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in October
Alton, IL
- Average wind speed in October: 8.1mph
The windiest month (with the highest average wind speed) is January (9.6mph).
The calmest month (with the lowest average wind speed) is July (5.7mph).
Average humidity in October
Alton, IL
- Average humidity in October: 71%
The month with the highest relative humidity is July (80%).
The month with the lowest relative humidity is October (71%).
Average rainfall in October
Alton, IL
- Average rainfall in October: 1.54"
The wettest month (with the highest rainfall) is May (2.44").
The driest month (with the least rainfall) is February (0.83").
Average rainfall days in October
Alton, IL
- Average rainfall days in October: 9.4 days
The month with the highest number of rainy days is July (15.4 days).
The month with the least rainy days is January (5.7 days).
Average snowfall in October
Alton, IL
- Average snowfall in October: 0"
The month with the highest snowfall is February (1.14").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in October
Alton, IL
- Average snowfall days in October: 0.1 days
The month with the highest number of snowfall days is January (5.4 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in October /
Average sunshine in October
Alton, IL
- Average daylight in October: 11h and 1min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in October: 6h and 1min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 30min).
Average sunshine days in October
Alton, IL
- Average sunshine days in October: 20.6 days
The month with the most sunshine days is December (21 days).
The month with the least sunshine days is June (12.6 days).
Average UV index in October
Alton, IL
- Average UV index in October: 3
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in October
Alton, IL
- Average cloud cover in October: 34
The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in October
Alton, IL
- Average visibility in October: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Alton, Illinois, USA
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