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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, like December, in Alton, Indiana, is an icy winter month, with temperature in the range of an average low of 25.7°F (-3.5°C) and an average high of 38.8°F (3.8°C). Temperature readings reach their annual highs in January, averaging 38.8°F (3.8°C) and a minimum average of 25.7°F (-3.5°C). Weather in January »
Weather in February
The last month of the winter, February, is a frosty month in Alton, Indiana, with an average temperature varying between 29.1°F (-1.6°C) and 43.9°F (6.6°C). Alton experiences a recorded average high-temperature of a frosty 43.9°F (6.6°C) in February, closely aligned with January's 38.8°F (3.8°C). Weather in February »
Weather in March
March, the first month of the spring in Alton, is a fresh month, with an average temperature varying between 54.1°F (12.3°C) and 37.4°F (3°C). As Alton enters March, the average high-temperature increases from the a frosty 43.9°F (6.6°C) of February to a cool 54.1°F (12.3°C). Weather in March »
Weather in April
April is a refreshing spring month in Alton, Indiana, with an average temperature varying between 66°F (18.9°C) and 47.1°F (8.4°C). As Alton transitions into April, the average high-temperature is observed to rise from a cool 54.1°F (12.3°C) in March to an enjoyable 66°F (18.9°C). Weather in April »
Weather in May
The last month of the spring, May, is a warm month in Alton, Indiana, with an average temperature varying between 75.4°F (24.1°C) and 56.8°F (13.8°C). As Alton enters May, the average high-temperature increases from the a refreshing 66°F (18.9°C) of April to a moderately hot 75.4°F (24.1°C). Weather in May »
Weather in June
The first month of the summer, June, is also a moderately hot month in Alton, Indiana, with an average temperature varying between 63.9°F (17.7°C) and 83.8°F (28.8°C). June's arrival brings a modest temperature shift, moving from a warm 75.4°F (24.1°C) in May to a still moderately hot 83.8°F (28.8°C). Weather in June »
Weather in July
July in Alton, Indiana, is a hot summer month, with temperature in the range of an average high of 86.5°F (30.3°C) and an average low of 67.1°F (19.5°C). July proves to be the warmest month, recording an average peak temperature of 86.5°F (30.3°C) and a minimum temperature of 67.1°F (19.5°C). July's mean heat index is estimated at a fiery hot 100.4°F (38°C). Weather in July »
Weather in August
The last month of the summer, August, is also a moderately hot month in Alton, Indiana, with temperature in the range of an average high of 85.6°F (29.8°C) and an average low of 65.5°F (18.6°C). Alton's shift from July to August is accompanied by an average high-temperature of a moderately hot 85.6°F (29.8°C), a slight deviation from 86.5°F (30.3°C). Weather in August »
Weather in September
September, the first month of the autumn in Alton, is still a warm month, with temperature in the range of an average low of 59.9°F (15.5°C) and an average high of 79.3°F (26.3°C). The start of September signals a gentle decrease in the average high-temperature, transitioning from a warm 85.6°F (29.8°C) in August to a still moderately hot 79.3°F (26.3°C). Weather in September »
Weather in October
October, the same as September, is another refreshing autumn month in Alton, Indiana, with an average temperature varying between 66.7°F (19.3°C) and 48°F (8.9°C). The shift from September to October involves a decrease in the average high-temperature, from a warm 79.3°F (26.3°C) to a comfortable 66.7°F (19.3°C). Weather in October »
Weather in November
November, the last month of the autumn in Alton, is also a fresh month, with an average temperature ranging between max 52.9°F (11.6°C) and min 37.6°F (3.1°C). As November begins, there is a decrease in the average high-temperature, falling from a comfortable 66.7°F (19.3°C) in October to a cool 52.9°F (11.6°C). Weather in November »
Weather in December
The first month of the winter, December, is still a chilly month in Alton, Indiana, with an average temperature ranging between min 31.8°F (-0.1°C) and max 43.9°F (6.6°C). Setting in of December comes with a decrease in the average high-temperature, moving from a fresh 52.9°F (11.6°C) in November to a chilly 43.9°F (6.6°C). Weather in December »
Updated: Aug 25, 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
What month is the coldest?
January, with an average high of 38.8°F (3.8°C) and a low of 25.7°F (-3.5°C), signifies the coldest month of the year.
How much does it rain?
In Alton, during the entire year, the rain falls for 160 days and collects up to 29.45" (748mm) of precipitation.
When does it snow?
Months with snowfall are January through April, September through December.
What is the snowiest month?
January is the month with the most snowfall. Snow falls for 7.6 days and accumulates 2.24" (57mm) of snow.
How much does it snow?
In Alton, during the entire year, snow falls for 26.8 days and aggregates up to 7.91" (201mm) of snow.
What are the months with the lowest UV index?
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.
What is the most humid month?
The months with the highest humidity are February and December, with an average relative humidity of 80%.
When is Daylight Saving Time (DST)?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.
What is the wettest month?
April is the month with the most rainfall in Alton. Rain falls for 15 days and accumulates 3.31" (84mm) of precipitation.
When it does not snow?
In Alton, snow does not fall in May through August.
When is the highest UV index?
The months with the highest UV index in Alton are May through August, with an average maximum UV index of 6.
When are the longest days?
With an average of 14h and 48min of daylight, June has the longest days of the year.
What is the hottest time of year?
July, with average temperatures reaching a high of 86.5°F (30.3°C) and a low of 67.1°F (19.5°C), is the warmest month.
What month has the most sunshine?
July has the most sunshine of the year in Alton, with an average of 10.3h of sunshine.
What is the driest month?
The month with the least rainfall is September, when the rain falls for 12.5 days and typically collects 1.61" (41mm) of precipitation.
What is the least humid month?
October is the least humid month, with an average relative humidity of 74%.
What is the month with the shortest days in Alton?
With an average of 9h and 36min of daylight, December has the shortest days of the year in Alton.
What is the month with the least sunshine?
With an average of 4.4h of sunshine, December has the least sunshine of the year.
Average temperature
Alton, IN
The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (38.8°F).
The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).
Average pressure
Alton, IN
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
29.96"Hg - Average pressure in May:
29.98"Hg - Average pressure in June:
29.95"Hg
- Average pressure in July:
29.98"Hg - Average pressure in August:
29.99"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.14"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 (29.95"Hg).
Average wind speed
Alton, IN
- Average wind speed in January:
7.7mph - Average wind speed in February:
7.7mph - Average wind speed in March:
7.5mph - Average wind speed in April:
7.6mph - Average wind speed in May:
6.2mph - Average wind speed in June:
5.6mph
- Average wind speed in July:
4.8mph - Average wind speed in August:
4.8mph - Average wind speed in September:
5.3mph - Average wind speed in October:
6.5mph - Average wind speed in November:
6.8mph - Average wind speed in December:
7.1mph
The windiest months (with the highest average wind speed) are January and February (7.7mph).
The calmest months (with the lowest average wind speed) are July and August (4.8mph).
Average humidity
Alton, IN
The months with the highest relative humidity are February and December (80%).
The month with the lowest relative humidity is October (74%).
Average rainfall
Alton, IN
- Average rainfall in January:
1.85" - Average rainfall in February:
2.91" - Average rainfall in March:
2.36" - Average rainfall in April:
3.31" - Average rainfall in May:
2.95" - Average rainfall in June:
2.56"
The wettest month (with the highest rainfall) is April (3.31").
The driest month (with the least rainfall) is September (1.61").
Average rainfall days
Alton, IN
- Average rainfall days in January:
10.3 days - Average rainfall days in February:
10.3 days - Average rainfall days in March:
14.3 days - Average rainfall days in April:
15 days - Average rainfall days in May:
18.7 days - Average rainfall days in June:
14.9 days
- Average rainfall days in July:
17.4 days - Average rainfall days in August:
15.1 days - Average rainfall days in September:
12.5 days - Average rainfall days in October:
10.4 days - Average rainfall days in November:
9.8 days - Average rainfall days in December:
11.3 days
The month with the highest number of rainy days is May (18.7 days).
The month with the least rainy days is November (9.8 days).
Average snowfall
Alton, IN
The month with the highest snowfall is January (2.24").
The months with the least snowfall are May, June, July and August (0").
Average snowfall days
Alton, IN
- Average snowfall days in January:
7.6 days - Average snowfall days in February:
7.3 days - Average snowfall days in March:
3.6 days - Average snowfall days in April:
0.6 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:
0.1 days - Average snowfall days in October:
0.2 days - Average snowfall days in November:
1.9 days - Average snowfall days in December:
5.5 days
The month with the highest number of snowfall days is January (7.6 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight / Average sunshine
Alton, IN
- Average daylight in January:
9h and 5min - Average daylight in February:
10h and 5min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 1min - Average daylight in May:
14h and 2min - Average daylight in June:
14h and 5min
- Average daylight in July:
14h and 3min - Average daylight in August:
13h and 4min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 1min - Average daylight in November:
10h and 1min - Average daylight in December:
9h and 4min
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 36min).
- Average sunshine in January:
4h and 3min - Average sunshine in February:
5h and 3min - Average sunshine in March:
6h and 1min - Average sunshine in April:
7h and 3min - Average sunshine in May:
8h and 5min - Average sunshine in June:
10h and 1min
- Average sunshine in July:
10h and 2min - Average sunshine in August:
9h and 3min - Average sunshine in September:
8h and 2min - Average sunshine in October:
7h and 1min - Average sunshine in November:
5h and 3min - Average sunshine in December:
4h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 4h and 24min).
Average sunshine days
Alton, IN
- Average sunshine days in January:
14.8 days - Average sunshine days in February:
12.7 days - Average sunshine days in March:
12.8 days - Average sunshine days in April:
12.8 days - Average sunshine days in May:
11.1 days - Average sunshine days in June:
12.3 days
- Average sunshine days in July:
11.8 days - Average sunshine days in August:
13.3 days - Average sunshine days in September:
14.8 days - Average sunshine days in October:
19.1 days - Average sunshine days in November:
17.3 days - Average sunshine days in December:
15.2 days
The month with the most sunshine days is October (19.1 days).
The month with the least sunshine days is May (11.1 days).
Average UV index
Alton, IN
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
Alton, IN
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility
Alton, IN
The months with the highest visibility are March, April, June, August, October and November (6mi).
The months with the lowest visibility are January, February, May, July, September and December (5mi).
Alton, Indiana, USA
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