Climate and monthly weather forecastEast Alton, IL
Climate and monthly weather forecast
Weather in January
January, like December, in East Alton, Illinois, is an icy winter month, with an average temperature varying between 23.4°F (-4.8°C) and 36.1°F (2.3°C). January is the month that records the lowest temperatures, with averages ranging from a high of 36.1°F (2.3°C) to a low of 23.4°F (-4.8°C). Weather in January »Weather in February
February, the last month of the winter in East Alton, is also an icy month, with an average temperature fluctuating between 41°F (5°C) and 27.1°F (-2.7°C). The beginning of February records an average high-temperature of a still wintry 41°F (5°C), marking a negligible difference from January's 36.1°F (2.3°C). Weather in February »Weather in March
The first month of the spring, March, is a fresh month in East Alton, Illinois, with an average temperature ranging between max 53.4°F (11.9°C) and min 37.2°F (2.9°C). As East Alton, Illinois, transitions into March, a rise in the average high-temperature is observed, moving from a wintry 41°F (5°C) in February to a fresh 53.4°F (11.9°C). Weather in March »Weather in April
April is a comfortable spring month in East Alton, Illinois, with temperature in the range of an average low of 46.9°F (8.3°C) and an average high of 64.4°F (18°C). April sees a temperature increase, moving from a fresh 53.4°F (11.9°C) in March to a comfortable 64.4°F (18°C). Weather in April »Weather in May
May, the last month of the spring in East Alton, is a moderately hot month, with an average temperature fluctuating between 57°F (13.9°C) and 74.1°F (23.4°C). May brings an increase in the average high-temperature, progressing from a refreshing 64.4°F (18°C) in April to a warm 74.1°F (23.4°C). Weather in May »Weather in June
The first month of the summer, June, is also a moderately hot month in East Alton, Illinois, with temperature in the range of an average high of 83.1°F (28.4°C) and an average low of 66.2°F (19°C). In June, the average high-temperature increases from a moderately hot 74.1°F (23.4°C) in May to a still warm 83.1°F (28.4°C). Weather in June »Weather in July
July, the same as June, is a moderately hot summer month in East Alton, Illinois, with an average temperature fluctuating between 85.3°F (29.6°C) and 67.6°F (19.8°C). The average temperatures reach their apex in July, averaging 85.3°F (29.6°C) at the high end and 67.6°F (19.8°C) at the low end. Throughout July, the heat index is computed to be a torrid 96.8°F (36°C). Weather in July »Weather in August
August, the last month of the summer in East Alton, is another warm month, with temperature in the range of an average low of 65.7°F (18.7°C) and an average high of 84°F (28.9°C). As East Alton welcomes August, the average high-temperature is noted at a still warm 84°F (28.9°C), closely aligning with the preceding month. Weather in August »Weather in September
The first month of the autumn, September, is still a warm month in East Alton, Illinois, with an average temperature fluctuating between 59.4°F (15.2°C) and 78.6°F (25.9°C). The shift from August to September includes a small decrease in the average high-temperature, from a warm 84°F (28.9°C) to a still moderately hot 78.6°F (25.9°C). Weather in September »Weather in October
October, like September, in East Alton, Illinois, is another refreshing autumn month, with an average temperature varying between 48.7°F (9.3°C) and 65.3°F (18.5°C). October's arrival corresponds with a decrease in average high-temperatures, from September's warm 78.6°F (25.9°C) to a comfortable 65.3°F (18.5°C). Weather in October »Weather in November
The last month of the autumn, November, is another cool month in East Alton, Illinois, with an average temperature ranging between min 37°F (2.8°C) and max 52.2°F (11.2°C). The commencement of November involves a temperature shift, with the average high-temperature dropping from a comfortable 65.3°F (18.5°C) in October to a fresh 52.2°F (11.2°C). Weather in November »Weather in December
The first month of the winter, December, is also an icy month in East Alton, Illinois, with an average temperature fluctuating between 41.4°F (5.2°C) and 29.8°F (-1.2°C). East Alton's weather changes with the onset of December, slightly falling from a cool 52.2°F (11.2°C) in November to a cold 41.4°F (5.2°C). Weather in December »Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January is the coldest month, exhibiting average temperatures of 36.1°F (2.3°C) at the peak and 23.4°F (-4.8°C) at the base.
Throughout the year, in East Alton, Illinois, there are 138 rainfall days, and 23.9" (607mm) of precipitation is accumulated.
Months with snowfall are January through April, November and December.
In East Alton, Illinois, during the entire year, snow falls for 18.6 days and aggregates up to 4.53" (115mm) of snow.
The months with the least sunshine in East Alton are January and February, with an average of 4.5h of sunshine.
The months with the lowest UV index in East Alton, Illinois, are January, February, November and December, with an average maximum UV index of 2.
February is the month with the least rainfall. Rain falls for 6.9 days and accumulates 1.14" (29mm) of precipitation.
February is the month with the most snowfall. Snow falls for 5.4 days and accumulates 1.61" (41mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in East Alton, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.
The month with the most rainfall is May, when the rain falls for 16.6 days and typically aggregates up to 3.07" (78mm) of precipitation.
In East Alton, Illinois, snow does not fall in May through October.
The months with the highest UV index in East Alton are May through August, with an average maximum UV index of 6.
With an average of 14h and 48min of daylight, June has the longest days of the year in East Alton, Illinois.
The month with the most sunshine in East Alton, Illinois, is June, with an average of 10.4h of sunshine.
July stands out as East Alton's warmest month, with temperatures ranging between an average high of 85.3°F (29.6°C) and a low of 67.6°F (19.8°C).
With an average relative humidity of 80%, July is the most humid month in East Alton.
October is the least humid month in East Alton, Illinois, with an average relative humidity of 71%.
The month with the shortest days in East Alton is December, with an average of 9h and 30min of daylight.
Average temperature
East Alton, IL
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).
The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).
Average pressure
East Alton, IL
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
29.94"Hg - Average pressure in May:
29.95"Hg - Average pressure in June:
29.92"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.12"Hg - Average pressure in December:
30.13"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
East Alton, IL
- Average wind speed in January:
9.6mph - Average wind speed in February:
9.6mph - Average wind speed in March:
9.4mph - Average wind speed in April:
9.3mph - Average wind speed in May:
7.6mph - Average wind speed in June:
6.6mph
- Average wind speed in July:
5.7mph - Average wind speed in August:
5.8mph - Average wind speed in September:
6.3mph - Average wind speed in October:
8.1mph - Average wind speed in November:
8.9mph - Average wind speed in December:
9mph
The windiest months (with the highest average wind speed) are January and February (9.6mph).
The calmest month (with the lowest average wind speed) is July (5.7mph).
Average humidity
East Alton, IL
The month with the highest relative humidity is July (80%).
The month with the lowest relative humidity is October (71%).
Average rainfall
East Alton, IL
- Average rainfall in January:
1.26" - Average rainfall in February:
1.14" - Average rainfall in March:
1.57" - Average rainfall in April:
2.4" - Average rainfall in May:
3.07" - Average rainfall in June:
2.76"
- Average rainfall in July:
2.48" - Average rainfall in August:
2.91" - Average rainfall in September:
1.69" - Average rainfall in October:
1.93" - Average rainfall in November:
1.3" - Average rainfall in December:
1.38"
The wettest month (with the highest rainfall) is May (3.07").
The driest month (with the least rainfall) is February (1.14").
Average rainfall days
East Alton, IL
- Average rainfall days in January:
5.6 days - Average rainfall days in February:
6.9 days - Average rainfall days in March:
12.3 days - Average rainfall days in April:
13.4 days - Average rainfall days in May:
16.6 days - Average rainfall days in June:
15.1 days
- Average rainfall days in July:
16.3 days - Average rainfall days in August:
14.3 days - Average rainfall days in September:
11.8 days - Average rainfall days in October:
10.5 days - Average rainfall days in November:
8.5 days - Average rainfall days in December:
6.7 days
The month with the highest number of rainy days is May (16.6 days).
The month with the least rainy days is January (5.6 days).
Average snowfall
East Alton, IL
The month with the highest snowfall is February (1.61").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
East Alton, IL
- Average snowfall days in January:
6 days - Average snowfall days in February:
5.4 days - Average snowfall days in March:
2 days - Average snowfall days in April:
0.3 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0.1 days - Average snowfall days in November:
1 days - Average snowfall days in December:
3.8 days
The month with the highest number of snowfall days is January (6 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
East Alton, IL
- Average daylight in January:
9h and 48min - Average daylight in February:
10h and 48min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 12min - Average daylight in May:
14h and 18min - Average daylight in June:
14h and 48min
- Average daylight in July:
14h and 36min - Average daylight in August:
13h and 36min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 12min - Average daylight in November:
10h and 6min - Average daylight in December:
9h and 30min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in January:
4h and 30min - Average sunshine in February:
4h and 30min - Average sunshine in March:
6h and 24min - Average sunshine in April:
8h and 30min - Average sunshine in May:
9h and 18min - Average sunshine in June:
10h and 24min
- Average sunshine in July:
10h and 18min - Average sunshine in August:
10h and 0min - Average sunshine in September:
9h and 18min - Average sunshine in October:
6h and 12min - Average sunshine in November:
5h and 30min - Average sunshine in December:
4h and 48min
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
East Alton, IL
- Average sunshine days in January:
20.3 days - Average sunshine days in February:
16.1 days - Average sunshine days in March:
15.3 days - Average sunshine days in April:
15.3 days - Average sunshine days in May:
12.5 days - Average sunshine days in June:
12.5 days
- Average sunshine days in July:
12.3 days - Average sunshine days in August:
14 days - Average sunshine days in September:
15.7 days - Average sunshine days in October:
19.7 days - Average sunshine days in November:
20.1 days - Average sunshine days in December:
20.4 days
The month with the most sunshine days is December (20.4 days).
The month with the least sunshine days is July (12.3 days).
Average UV index
East Alton, IL
The months with the highest UV index are May, 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
East Alton, IL
The month with the most cloud cover is January (Cloud cover 51).
The months with the least cloud cover are June, July and August (Cloud cover 29).
Average visibility
East Alton, IL
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).
