Climate and monthly weather forecast
Alton, IA

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Weather in January

January, like December, is a freezing cold winter month in Alton, Iowa, with an average temperature ranging between min 11.3°F (-11.5°C) and max 24.6°F (-4.1°C). In Alton, January records the lowest average temperatures, peaking at 24.6°F (-4.1°C) and reaching a low of 11.3°F (-11.5°C). Weather in January »

Weather in February

The last month of the winter, February, is another freezing cold month in Alton, Iowa, with an average temperature fluctuating between 14.4°F (-9.8°C) and 28.2°F (-2.1°C). With the onset of February, the average high-temperature stands at a still freezing cold 28.2°F (-2.1°C), closely aligned with January's 24.6°F (-4.1°C). Weather in February »

Weather in March

The first month of the spring, March, is a frosty month in Alton, Iowa, with an average temperature varying between 44.2°F (6.8°C) and 29.5°F (-1.4°C). The arrival of March brings a distinct temperature shift, with the average high-temperature escalating from a freezing cold 28.2°F (-2.1°C) in February to a frosty 44.2°F (6.8°C). Weather in March »

Weather in April

April is a moderate spring month in Alton, Iowa, with an average temperature varying between 40.1°F (4.5°C) and 56.8°F (13.8°C). The arrival of April signals an increase in the average high-temperature, moving from a frosty 44.2°F (6.8°C) in March to a moderate 56.8°F (13.8°C). Weather in April »

Weather in May

May, the last month of the spring in Alton, is an agreeable month, with temperature in the range of an average low of 51.6°F (10.9°C) and an average high of 68.5°F (20.3°C). May's arrival brings a change in high-temperatures, moving from a mild 56.8°F (13.8°C) in April to an agreeable 68.5°F (20.3°C). Weather in May »

Weather in June

June, the first month of the summer in Alton, is a moderately hot month, with an average temperature fluctuating between 61.7°F (16.5°C) and 78.1°F (25.6°C). Alton's transition into June is marked by a rise in the average high-temperature, advancing from an agreeable 68.5°F (20.3°C) in May to a moderately hot 78.1°F (25.6°C). Weather in June »

Weather in July

July, the same as June, is another warm summer month in Alton, Iowa, with an average temperature fluctuating between 63.3°F (17.4°C) and 81.7°F (27.6°C). In Alton, the peak average temperatures are observed in July, with a high of 81.7°F (27.6°C) and a low of 63.3°F (17.4°C). In July, the heat index is computed to be a hot 87.8°F (31°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Alton, Iowa, with temperature in the range of an average high of 80.2°F (26.8°C) and an average low of 60.4°F (15.8°C). Alton's entry into August measures an average high-temperature of a still warm 80.2°F (26.8°C), closely parallel to the preceding month. Weather in August »

Weather in September

The first month of the autumn, September, is still a warm month in Alton, Iowa, with an average temperature varying between 74.3°F (23.5°C) and 54.5°F (12.5°C). September indicates a minor shift in the average high-temperature, from August's 80.2°F (26.8°C) to a still moderately hot 74.3°F (23.5°C). Weather in September »

Weather in October

October, the same as September, in Alton, Iowa, is another mild autumn month, with an average temperature fluctuating between 58.1°F (14.5°C) and 42.6°F (5.9°C). A shift in Alton's weather is noticeable as September turns into October, with the average high temperature decreasing from a moderately hot 74.3°F (23.5°C) to a refreshing 58.1°F (14.5°C). Weather in October »

Weather in November

The last month of the autumn, November, is also a frosty month in Alton, Iowa, with an average temperature varying between 44.1°F (6.7°C) and 30.6°F (-0.8°C). Alton's November weather shows a moderate shift in high-temperatures, falling from October's refreshing 58.1°F (14.5°C) to a frosty 44.1°F (6.7°C). Weather in November »

Weather in December

The first month of the winter, December, is still a freezing cold month in Alton, Iowa, with an average temperature varying between 28.8°F (-1.8°C) and 17.4°F (-8.1°C). Alton's December weather is marked by a distinct drop in high-temperatures, declining from a frosty 44.1°F (6.7°C) in November to a subzero cold 28.8°F (-1.8°C). Weather in December »
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Frequently asked questions

What is the coldest month in Alton?

Alton's January weather, with an average high temperature of 24.6°F (-4.1°C) and an average low temperature of 11.3°F (-11.5°C), tends to be the coldest of the year.

What is the most humid month in Alton?

January is the most humid month, with an average relative humidity of 86%.

What is the driest month in Alton?

The month with the least rainfall in Alton, Iowa, is January, when the rain falls for 3.8 days and typically collects 0.79" (20mm) of precipitation.

How many days does it rain in Alton?

Throughout the year, there are 124 rainfall days, and 24.09" (612mm) of precipitation is accumulated.

When does it snow in Alton?

Months with snowfall in Alton, Iowa, are January through May, October through December.

How many days does it snow in Alton?

In Alton, during the entire year, snow falls for 49.5 days and aggregates up to 18.39" (467mm) of snow.

What is the month with the least sunshine in Alton?

With an average of 3.9h of sunshine, January has the least sunshine of the year in Alton, Iowa.

What is the month with the lowest UV index in Alton?

January and December, with an average maximum UV index of 1, are months with the lowest UV index in Alton, Iowa.

What is the snowiest month in Alton?

February is the month with the most snowfall in Alton. Snow falls for 10 days and accumulates 4.61" (117mm) of snow.

When is Daylight Saving Time (DST) in Alton?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, 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.

What is the rainiest month in Alton?

The month with the most rainfall is June, when the rain falls for 18 days and typically aggregates up to 3.82" (97mm) of precipitation.

When it does not snow in Alton?

In Alton, snow does not fall in June through September.

When are the longest days in Alton?

With an average of 15h and 18min of daylight, June has the longest days of the year in Alton.

When is the highest UV index in Alton?

June and July, with an average maximum UV index of 6, are months with the highest UV index.

What month is the hottest in Alton?

Temperature readings in Alton reach their annual highs in July, averaging 81.7°F (27.6°C) and a minimum average of 63.3°F (17.4°C).

What month has the most sunshine in Alton?

July has the most sunshine of the year in Alton, with an average of 10.4h of sunshine.

What is the least humid month in Alton?

With an average relative humidity of 67%, October is the least humid month.

What is the month with the shortest days in Alton?

December has the shortest days of the year in Alton, with an average of 9h and 6min of daylight.

Average temperature
Alton, IA

Average temperature - Alton, IA

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (24.6°F).

The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (11.3°F).

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Average pressure
Alton, IA

Average pressure - Alton, IA

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).

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Average wind speed
Alton, IA

Average wind speed - Alton, IA

The windiest month (with the highest average wind speed) is April (11.3mph).
The calmest month (with the lowest average wind speed) is July (7.8mph).

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Average rainfall
Alton, IA

Average rainfall - Alton, IA

The wettest month (with the highest rainfall) is June (3.82").
The driest month (with the least rainfall) is January (0.79").

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Average rainfall days
Alton, IA

Average rainfall days - Alton, IA

The month with the highest number of rainy days is June (18 days).
The month with the least rainy days is February (2.8 days).

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Average snowfall
Alton, IA

Average snowfall - Alton, IA

The month with the highest snowfall is February (4.61").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days
Alton, IA

Average snowfall days - Alton, IA

The month with the highest number of snowfall days is January (12.1 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
Alton, IA

Average daylight / Average sunshine - Alton, IA

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).

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Average sunshine days
Alton, IA

Average sunshine days - Alton, IA

The month with the most sunshine days is November (20.3 days).
The month with the least sunshine days is June (9.3 days).

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Average visibility
Alton, IA

Average visibility - Alton, IA

The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).

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Alton, Iowa, USA

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