What’s the climate like in Alton?
The current climate of Alton features average monthly temperatures ranging from highs of 31°C during the day to lows of 5°C. The average yearly temperature is around 20°C. At night, temperatures in the colder months average around -5°C and in the warmer months around 20°C.
The highest temperature recorded in Alton in recent years was 40°C in July 2017. The lowest daytime temperature recorded was -16°C in January 2014.
On average, Alton gets 1400 mm of precipitation each year. Of this, about 43 cm is snowfall. For comparison, London gets 701 mm of precipitation each year.
Best time to visit Alton?
The best time to visit Alton for pleasant to warm weather is April through October. There might be some rain during this period, but the temperatures are just right for exploring Alton.
Climate Table of Alton
The climate table of Alton shows the average temperatures, precipitation, snow, and UV index per month. The table gives an overview of the average day and night temperatures in degrees Celsius, the total amount of precipitation in millimetres, the total snowfall in centimetres, and the UV index for each month. Precipitation is always measured as water, even if it's snow or hail.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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| Temp. max (°C) | 5 | 6 | 14 | 20 | 25 | 31 | 31 | 30 | 28 | 21 | 13 | 8 |
| Temp. min (°C) | -4 | -4 | 3 | 8 | 14 | 20 | 21 | 20 | 16 | 10 | 3 | -1 |
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| Precipitation (mm) | 54 | 82 | 130 | 167 | 135 | 126 | 172 | 164 | 82 | 106 | 96 | 86 |
| Snow (cm) | 11 | 22 | 2,4 | 0,5 | 0 | 0 | 0 | 0 | 0 | 0,2 | 2,6 | 3,6 |
| UV Index | 2 | 3 | 4 | 6 | 7 | 6 | 7 | 6 | 6 | 4 | 2 | 3 |
Click on the month name to see more weather details, like daily averages, temperatures, and precipitation for the past years in that month.
- Average yearly temperature: 20°C
- Highest temperature: 31°C in June and July
- Lowest temperature: 5°C in January
- Precipitation*: 1400 mm per year, averaging 117 mm per month
- Snowfall: 43 cm per year
- Driest months: 54 mm in January, 82 mm in February and September
- Wettest months: 172 mm in July, 167 mm in April and 164 mm in August
*Precipitation is measured as a combination of rain, snow, and hail
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Table of Contents
Average Temperature per Month in Alton
This graph shows the average maximum temperatures per month in Alton, Illinois. The temperatures are shown in degrees Celsius and the average is calculated based on the recorded temperatures per month from past years.
Average Precipitation per Month in Alton
This graph shows how much precipitation Alton, Illinois, gets on average per month. Precipitation is always measured as water, even if it's snow or hail. This makes it easy to compare how much has fallen, regardless of the form of precipitation. The amount of precipitation is measured in millimetres and the average is calculated based on the recorded precipitation per month from past years.
Average Snowfall per Month in Alton
This graph shows how much snow Alton, Illinois, gets on average per month. The amount of snowfall is measured in centimetres and the average is calculated based on the recorded snowfall per month from past years.
Average UV Index per Month in Alton
This graph shows the average UV index per month in Alton, Illinois. The UV index indicates the intensity of ultraviolet radiation and ranges from 0 to a maximum of 11.
Yearly Temperature in Alton
This graph shows the average yearly temperature in Alton, Illinois. The yearly temperature, expressed in degrees Celsius, is the average of all twelve monthly temperatures summed up for that year.
Total Yearly Precipitation in Alton
This chart shows the total yearly precipitation in Alton, Illinois, over the past few years. The total yearly precipitation, measured in millimetres, is the sum of all the rain that fell in the twelve months of that year.
Total Yearly Snowfall in Alton
This chart shows the total yearly snowfall in Alton, Illinois, over the past few years. The total yearly snowfall, measured in centimetres, is the sum of all the snow that fell in the twelve months of that year.
Weather experiences in Alton
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Average Weather in Alton by Month
Click on a month below to see detailed weather info for Alton. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
