Climate and monthly weather forecast
Grimes, IA

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Weather in January

January, the same as December, in Grimes, Iowa, is a freezing cold winter month, with an average temperature varying between 27.9°F (-2.3°C) and 14.4°F (-9.8°C). January brings the lowest temperatures, with an average high of 27.9°F (-2.3°C) and an average low of 14.4°F (-9.8°C). Weather in January »

Weather in February

February, the last month of the winter in Grimes, is another freezing cold month, with an average temperature ranging between min 18°F (-7.8°C) and max 31.5°F (-0.3°C). With February's arrival, Grimes, Iowa, notes an average high-temperature of a still subzero cold 31.5°F (-0.3°C), closely following the trend of the preceding month. Weather in February »

Weather in March

March, the first month of the spring in Grimes, is a frosty month, with an average temperature ranging between max 46.9°F (8.3°C) and min 31.8°F (-0.1°C). An increase in the average high-temperature marks March, surging from February's subzero cold 31.5°F (-0.3°C) to a chilly 46.9°F (8.3°C). Weather in March »

Weather in April

April is a refreshing spring month in Grimes, Iowa, with temperature in the range of an average low of 42.4°F (5.8°C) and an average high of 59.4°F (15.2°C). Grimes's transition into April is marked by a temperature shift, moving from a chilly 46.9°F (8.3°C) in March to a refreshing 59.4°F (15.2°C). Weather in April »

Weather in May

May, the last month of the spring in Grimes, is an agreeable month, with temperature in the range of an average low of 52.9°F (11.6°C) and an average high of 69.6°F (20.9°C). With the transition into May, Grimes experiences an increase in average high-temperatures, moving up from a mild 59.4°F (15.2°C) in April to an agreeable 69.6°F (20.9°C). Weather in May »

Weather in June

June, the first month of the summer in Grimes, is a moderately hot month, with an average temperature fluctuating between 62.4°F (16.9°C) and 79.3°F (26.3°C). June indicates a change in the average high-temperature, moving up from an agreeable 69.6°F (20.9°C) in May to a warm 79.3°F (26.3°C). Weather in June »

Weather in July

July, the same as June, is a moderately hot summer month in Grimes, Iowa, with an average temperature varying between 82.4°F (28°C) and 65.1°F (18.4°C). The temperatures reach their highest averages in July, with highs of 82.4°F (28°C) and lows of 65.1°F (18.4°C). July's heat index is evaluated at a hot 89.6°F (32°C). Weather in July »

Weather in August

August, the last month of the summer in Grimes, is also a moderately hot month, with an average temperature fluctuating between 81.3°F (27.4°C) and 62.2°F (16.8°C). A minor adjustment in Grimes's average high-temperature is noted with the start of August, touching a still warm 81.3°F (27.4°C) from July's 82.4°F (28°C). Weather in August »

Weather in September

September, the first month of the autumn in Grimes, is still a warm month, with temperature in the range of an average low of 55.9°F (13.3°C) and an average high of 75.6°F (24.2°C). September sees a slight reduction in average high-temperature, with a shift from a warm 81.3°F (27.4°C) in August to a still moderately hot 75.6°F (24.2°C). Weather in September »

Weather in October

October, the same as September, in Grimes, Iowa, is a moderate autumn month, with an average temperature varying between 44.6°F (7°C) and 60.4°F (15.8°C). Witnessing a clear downswing, the average high-temperature during October drops from September's warm 75.6°F (24.2°C) to a mild 60.4°F (15.8°C). Weather in October »

Weather in November

The last month of the autumn, November, is another chilly month in Grimes, Iowa, with an average temperature ranging between max 46.9°F (8.3°C) and min 32.5°F (0.3°C). Grimes experiences a temperature shift at the start of November, with average high-temperatures adjusting from a mild 60.4°F (15.8°C) in October to a chilly 46.9°F (8.3°C). Weather in November »

Weather in December

The first month of the winter, December, is also a wintry month in Grimes, Iowa, with an average temperature fluctuating between 33.8°F (1°C) and 22.1°F (-5.5°C). December brings a drop in Grimes's average high-temperature, falling from a frosty 46.9°F (8.3°C) in November to an icy 33.8°F (1°C). Weather in December »
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Frequently asked questions

What are the coldest months in Grimes?

January, having an average high-temperature of 27.9°F (-2.3°C) and an average low-temperature of 14.4°F (-9.8°C), is the coldest month in Grimes.

What is the most humid month in Grimes?

With an average relative humidity of 83%, January is the most humid month in Grimes, Iowa.

What is the driest month in Grimes?

January is the month with the least rainfall in Grimes. Rain falls for 3.8 days and accumulates 0.47" (12mm) of precipitation.

How much does it rain in Grimes?

In Grimes, Iowa, during the entire year, the rain falls for 114.6 days and collects up to 15.51" (394mm) of precipitation.

When does it snow in Grimes?

January through May, October through December are months with snowfall.

When does it snow the most in Grimes?

The month with the most snowfall in Grimes is January, when snow falls for 8.4 days and typically aggregates up to 2.2" (56mm) of snow.

How many days does it snow in Grimes?

In Grimes, Iowa, during the entire year, snow falls for 29.6 days and aggregates up to 6.77" (172mm) of snow.

What is the month with the least sunshine in Grimes?

The month with the least sunshine in Grimes is January, with an average of 4.3h of sunshine.

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

The month with the lowest UV index in Grimes is January, with an average maximum UV index of 1.

When is Daylight Saving Time (DST) in Grimes?

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

The months with the most rainfall are May and June, with an average 2.52" (64mm) of precipitation.

When it does not snow in Grimes?

June through September are months without snowfall in Grimes, Iowa.

When are the longest days in Grimes?

With an average of 15h and 12min of daylight, June has the longest days of the year in Grimes, Iowa.

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

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

What month is the hottest in Grimes?

In Grimes, Iowa, the average highest temperatures are observed in July, with a high of 82.4°F (28°C) and a low of 65.1°F (18.4°C).

What month has the most sunshine in Grimes?

With an average of 10.4h of sunshine, July has the most sunshine of the year.

What is the least humid month in Grimes?

With an average relative humidity of 70%, October is the least humid month.

What is the month with the shortest days in Grimes?

The month with the shortest days in Grimes, Iowa, is December, with an average of 9h and 12min of daylight.

Average temperature
Grimes, IA

Average temperature - Grimes, IA

The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (27.9°F).

The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (14.4°F).

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Average pressure
Grimes, IA

Average pressure - Grimes, IA

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

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Average wind speed
Grimes, IA

Average wind speed - Grimes, IA

The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).

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Average rainfall
Grimes, IA

Average rainfall - Grimes, IA

The wettest months (with the highest rainfall) are May and June (2.52").
The driest month (with the least rainfall) is January (0.47").

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Average rainfall days
Grimes, IA

Average rainfall days - Grimes, IA

The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is February (3.5 days).

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Average snowfall
Grimes, IA

Average snowfall - Grimes, IA

The month with the highest snowfall is January (2.2").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days
Grimes, IA

Average snowfall days - Grimes, IA

The month with the highest number of snowfall days is January (8.4 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
Grimes, IA

Average daylight / Average sunshine - Grimes, IA

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).

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Average sunshine days
Grimes, IA

Average sunshine days - Grimes, IA

The month with the most sunshine days is December (22.8 days).
The month with the least sunshine days is June (11.2 days).

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Average visibility
Grimes, IA

Average visibility - Grimes, IA

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

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Grimes, Iowa, USA

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