Climate and monthly weather forecast
Illmo, MO

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Weather in January

January, like December, in Illmo, Missouri, is an icy winter month, with an average temperature fluctuating between 41°F (5°C) and 27.9°F (-2.3°C). Illmo's January weather reaches an average high of 41°F (5°C) and an average low of 27.9°F (-2.3°C), making it the coldest month. Weather in January »

Weather in February

February, the last month of the winter in Illmo, is a frosty month, with an average temperature fluctuating between 45.5°F (7.5°C) and 31.5°F (-0.3°C). January's transformation into February witnesses an average high-temperature of a chilly 45.5°F (7.5°C), noting a minor change from the preceding month. Weather in February »

Weather in March

The first month of the spring, March, is a mild month in Illmo, Missouri, with temperature in the range of an average high of 56.3°F (13.5°C) and an average low of 40.5°F (4.7°C). Illmo's weather shows a temperature rise with the arrival of March, moving from a frosty 45.5°F (7.5°C) in February to a mild 56.3°F (13.5°C). Weather in March »

Weather in April

April in Illmo, Missouri, is a refreshing spring month, with temperature in the range of an average high of 67.1°F (19.5°C) and an average low of 49.8°F (9.9°C). April's onset brings a temperature rise, moving from a moderate 56.3°F (13.5°C) in March to a still refreshing 67.1°F (19.5°C). Weather in April »

Weather in May

May, the last month of the spring in Illmo, is a moderately hot month, with an average temperature fluctuating between 76.3°F (24.6°C) and 59°F (15°C). Illmo's May weather brings a rise in high-temperatures, moving from a comfortable 67.1°F (19.5°C) in April to a warm 76.3°F (24.6°C). Weather in May »

Weather in June

June, the first month of the summer in Illmo, is a tropical month, with temperature in the range of an average high of 86°F (30°C) and an average low of 67.5°F (19.7°C). The onset of June marks an increase in the average high-temperature, moving from a moderately hot 76.3°F (24.6°C) in May to a hot 86°F (30°C). Weather in June »

Weather in July

July, like June, is a hot summer month in Illmo, Missouri, with an average temperature varying between 69.4°F (20.8°C) and 88.3°F (31.3°C). The warmest time of the year is July, with temperatures averaging a high of 88.3°F (31.3°C) and a low of 69.4°F (20.8°C). July's heat index is estimated at a scorching 104°F (40°C). Weather in July »

Weather in August

The last month of the summer, August, is another tropical month in Illmo, Missouri, with an average temperature varying between 86.2°F (30.1°C) and 67.1°F (19.5°C). The arrival of August brings an average high-temperature of a still hot 86.2°F (30.1°C), nearly identical to July's 88.3°F (31.3°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a warm month in Illmo, Missouri, with an average temperature fluctuating between 81.1°F (27.3°C) and 61.3°F (16.3°C). Illmo, Missouri, experiences an average high-temperature of a warm 81.1°F (27.3°C) in September, subtly different from August's 86.2°F (30.1°C). Weather in September »

Weather in October

October, like September, is another pleasant autumn month in Illmo, Missouri, with an average temperature varying between 50.7°F (10.4°C) and 68.9°F (20.5°C). The onset of October entails a temperature shift, as the average high-temperature decreases from a warm 81.1°F (27.3°C) in September to an agreeable 68.9°F (20.5°C). Weather in October »

Weather in November

The last month of the autumn, November, is also a fresh month in Illmo, Missouri, with temperature in the range of an average high of 54.7°F (12.6°C) and an average low of 39.7°F (4.3°C). As Illmo enters November, the average high-temperature decreases from the an agreeable 68.9°F (20.5°C) of October to a fresh 54.7°F (12.6°C). Weather in November »

Weather in December

December, the first month of the winter in Illmo, is also a frosty month, with temperature in the range of an average low of 33.1°F (0.6°C) and an average high of 45.5°F (7.5°C). The move into December indicates a reduction in the average high-temperature, down from November's cool 54.7°F (12.6°C) to a frosty 45.5°F (7.5°C). Weather in December »
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Frequently asked questions

What time of the year is the coldest in Illmo?

January, characterized by an average high temperature of 41°F (5°C) and a low temperature of 27.9°F (-2.3°C), is generally the coldest month.

How many days does it rain in Illmo?

Throughout the year, in Illmo, Missouri, there are 158.6 rainfall days, and 35.59" (904mm) of precipitation is accumulated.

When does it snow in Illmo?

January through April, October through December are months with snowfall in Illmo, Missouri.

How many days does it snow in Illmo?

Throughout the year, there are 11.2 snowfall days, and 4.92" (125mm) of snow is accumulated.

When is the lowest UV index in Illmo?

January, February and December, with an average maximum UV index of 2, are months with the lowest UV index in Illmo, Missouri.

What is the snowiest month in Illmo?

February is the month with the most snowfall in Illmo, Missouri. Snow falls for 3.6 days and accumulates 2.17" (55mm) of snow.

What is the month with the least sunshine in Illmo?

February has the least sunshine of the year, with an average of 4.8h of sunshine.

What is the most humid month in Illmo?

March and May, with an average relative humidity of 78%, are most humid months in Illmo, Missouri.

When is Daylight Saving Time (DST) in Illmo?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Illmo, Missouri, 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 wettest month in Illmo?

The month with the most rainfall in Illmo is April, when the rain falls for 15.3 days and typically aggregates up to 4.33" (110mm) of precipitation.

When it does not snow in Illmo?

In Illmo, snow does not fall in May through September.

What is the month with the highest UV index in Illmo?

The months with the highest UV index are May through August, with an average maximum UV index of 6.

When are the longest days in Illmo?

With an average of 14h and 42min of daylight, June has the longest days of the year in Illmo, Missouri.

What month has the most sunshine in Illmo?

With an average of 10.7h of sunshine, June has the most sunshine of the year in Illmo.

What part of the year is the hottest in Illmo?

The warmest temperatures occur during July, when averages reach a peak of 88.3°F (31.3°C) and a low of 69.4°F (20.8°C).

What is the driest month in Illmo?

The month with the least rainfall is September, when the rain falls for 11.4 days and typically collects 1.5" (38mm) of precipitation.

What is the least humid month in Illmo?

October is the least humid month, with an average relative humidity of 69%.

What is the month with the shortest days in Illmo?

December has the shortest days of the year in Illmo, with an average of 9h and 42min of daylight.

Average pressure
Illmo, MO

Average pressure - Illmo, MO

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

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Average wind speed
Illmo, MO

Average wind speed - Illmo, MO

The windiest months (with the highest average wind speed) are January and February (9.1mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).

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Average humidity
Illmo, MO

Average humidity - Illmo, MO

The months with the highest relative humidity are March and May (78%).
The month with the lowest relative humidity is October (69%).

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Average rainfall
Illmo, MO

Average rainfall - Illmo, MO

The wettest month (with the highest rainfall) is April (4.33").
The driest month (with the least rainfall) is September (1.5").

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Average rainfall days
Illmo, MO

Average rainfall days - Illmo, MO

The month with the highest number of rainy days is July (17 days).
The month with the least rainy days is January (9.8 days).

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Average snowfall
Illmo, MO

Average snowfall - Illmo, MO

The month with the highest snowfall is February (2.17").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days
Illmo, MO

Average snowfall days - Illmo, MO

The month with the highest number of snowfall days is January (3.7 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight / Average sunshine
Illmo, MO

Average daylight / Average sunshine - Illmo, MO

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 42min).

The month with the most sunshine is June (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

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Average sunshine days
Illmo, MO

Average sunshine days - Illmo, MO

The month with the most sunshine days is October (18.6 days).
The month with the least sunshine days is July (11.9 days).

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Average UV index
Illmo, MO

Average UV index - Illmo, MO

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 and December (UV index 2).

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Average visibility
Illmo, MO

Average visibility - Illmo, MO

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).

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Illmo, Missouri, USA

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