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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, is a freezing cold winter month in Grimes, Iowa, with an average temperature fluctuating between 14.4°F (-9.8°C) and 27.9°F (-2.3°C). January is the coldest month, with the temperature often reaching 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 varying between 31.5°F (-0.3°C) and 18°F (-7.8°C). The onset of February brings an average high-temperature of a still freezing cold 31.5°F (-0.3°C), nearly matching the January temperature. Weather in February »
Weather in March
The first month of the spring, March, is a frosty month in Grimes, Iowa, with an average temperature varying between 46.9°F (8.3°C) and 31.8°F (-0.1°C). With the beginning of March, Grimes's average high-temperature experiences a significant increase, moving from a subzero cold 31.5°F (-0.3°C) in February to a chilly 46.9°F (8.3°C). Weather in March »
Weather in April
April in Grimes, Iowa, is a refreshing spring month, 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 in April sees a temperature change, with average high-temperatures 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
The last month of the spring, May, is an agreeable month in Grimes, Iowa, with temperature in the range of an average high of 69.6°F (20.9°C) and an average low of 52.9°F (11.6°C). May comes with an increase, with the average high-temperature moving from a mild 59.4°F (15.2°C) in April to a pleasant 69.6°F (20.9°C). Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in Grimes, Iowa, with an average temperature ranging between min 62.4°F (16.9°C) and max 79.3°F (26.3°C). The arrival of June sees a shift in the average high-temperature, moving from a pleasant 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). July is the month when Grimes sees the highest average temperatures, with a high of 82.4°F (28°C) and a low of 65.1°F (18.4°C). For most parts of July, the heat index is calculated to be a hot 89.6°F (32°C). Weather in July »
Weather in August
The last month of the summer, August, is also a moderately hot month in Grimes, Iowa, with an average temperature varying between 81.3°F (27.4°C) and 62.2°F (16.8°C). In August, Grimes's weather conditions record an average high-temperature of a still moderately hot 81.3°F (27.4°C), demonstrating little divergence from the preceding month. Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Grimes, Iowa, with an average temperature varying between 75.6°F (24.2°C) and 55.9°F (13.3°C). September's onset corresponds with a subtle shift in the average high-temperature, slightly moving from 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 another mild autumn month, with an average temperature ranging between min 44.6°F (7°C) and max 60.4°F (15.8°C). The average high-temperature exhibits a considerable decrease in October, dropping from a warm 75.6°F (24.2°C) in September to a mild 60.4°F (15.8°C). Weather in October »
Weather in November
November, the last month of the autumn in Grimes, is also a frosty month, with temperature in the range of an average low of 32.5°F (0.3°C) and an average high of 46.9°F (8.3°C). Onset of November witnesses a reduction in the average high-temperature, falling from a refreshing 60.4°F (15.8°C) in October to a frosty 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 ranging between max 33.8°F (1°C) and min 22.1°F (-5.5°C). With December's onset, the weather shows a temperature decrease, transitioning from a chilly 46.9°F (8.3°C) in November to a wintry 33.8°F (1°C). Weather in December »
Updated: Aug 28, 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 part of the year is the coldest?
Grimes's January weather, with an average high temperature of 27.9°F (-2.3°C) and an average low temperature of 14.4°F (-9.8°C), tends to be the coldest of the year.
What is the most humid month?
January is the most humid month, with an average relative humidity of 83%.
What is the driest month?
January is the month with the least rainfall. Rain falls for 3.8 days and accumulates 0.47" (12mm) of precipitation.
How much does it rain?
In Grimes, during the entire year, the rain falls for 114.6 days and collects up to 15.51" (394mm) of precipitation.
When does it snow?
Months with snowfall are January through May, October through December.
What is the snowiest month?
January is the month with the most snowfall. Snow falls for 8.4 days and accumulates 2.2" (56mm) of snow.
How much does it snow?
Throughout the year, there are 29.6 snowfall days, and 6.77" (172mm) of snow is accumulated.
What is the month with the least sunshine?
January has the least sunshine of the year, with an average of 4.3h of sunshine.
When is the lowest UV index?
January is the month with the lowest UV index, with an average maximum UV index of 1.
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 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?
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, snow does not fall in June through September.
When are the longest days?
June has the longest days of the year, with an average of 15h and 12min of daylight.
What are the months with the highest UV index?
June and July, with an average maximum UV index of 6, are months with the highest UV index.
What is the hottest time of year?
July, marked by an average high-temperature of 82.4°F (28°C) and a low-temperature of 65.1°F (18.4°C), is the warmest month.
What month has the most sunshine?
With an average of 10.4h of sunshine, July has the most sunshine of the year.
What is the least humid month?
The least humid month is October, with an average relative humidity of 70%.
What is the month with the shortest days?
December has the shortest days of the year, with an average of 9h and 12min of daylight.
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).
Average pressure
Grimes, IA
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.14"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.93"Hg - Average pressure in June:
29.88"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.96"Hg - Average pressure in September:
30.01"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.12"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed
Grimes, IA
- Average wind speed in January:
10.3mph - Average wind speed in February:
10.3mph - Average wind speed in March:
10.3mph - Average wind speed in April:
10.4mph - Average wind speed in May:
8.8mph - Average wind speed in June:
8mph
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).
Average humidity
Grimes, IA
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is October (70%).
Average rainfall
Grimes, IA
- Average rainfall in January:
0.47" - Average rainfall in February:
0.51" - Average rainfall in March:
0.94" - Average rainfall in April:
1.3" - Average rainfall in May:
2.52" - Average rainfall in June:
2.52"
- Average rainfall in July:
1.42" - Average rainfall in August:
1.81" - Average rainfall in September:
1.73" - Average rainfall in October:
1.06" - Average rainfall in November:
0.67" - Average rainfall in December:
0.55"
The wettest months (with the highest rainfall) are May and June (2.52").
The driest month (with the least rainfall) is January (0.47").
Average rainfall days
Grimes, IA
- Average rainfall days in January:
3.8 days - Average rainfall days in February:
3.5 days - Average rainfall days in March:
9.3 days - Average rainfall days in April:
13.1 days - Average rainfall days in May:
16.3 days - Average rainfall days in June:
15.8 days
- Average rainfall days in July:
12.8 days - Average rainfall days in August:
12.3 days - Average rainfall days in September:
9.7 days - Average rainfall days in October:
8.1 days - Average rainfall days in November:
6.1 days - Average rainfall days in December:
3.8 days
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).
Average snowfall
Grimes, IA
- Average snowfall in January:
2.2" - Average snowfall in February:
1.93" - Average snowfall in March:
0.94" - Average snowfall in April:
0.24" - Average snowfall in May:
0.08" - Average snowfall in June:
0"
The month with the highest snowfall is January (2.2").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Grimes, IA
- Average snowfall days in January:
8.4 days - Average snowfall days in February:
7.7 days - Average snowfall days in March:
4.4 days - Average snowfall days in April:
0.8 days - Average snowfall days in May:
0.2 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:
0.6 days - Average snowfall days in November:
2 days - Average snowfall days in December:
5.5 days
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).
Average daylight / Average sunshine
Grimes, IA
- Average daylight in January:
9h and 4min - Average daylight in February:
10h and 4min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 4min - Average daylight in June:
15h and 1min
- Average daylight in July:
14h and 5min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 1min - Average daylight in November:
9h and 5min - Average daylight in December:
9h and 1min
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).
- Average sunshine in January:
4h and 2min - Average sunshine in February:
4h and 5min - Average sunshine in March:
6h and 1min - Average sunshine in April:
8h and 1min - Average sunshine in May:
8h and 5min - Average sunshine in June:
9h and 5min
- Average sunshine in July:
10h and 2min - Average sunshine in August:
9h and 5min - Average sunshine in September:
9h and 2min - Average sunshine in October:
5h and 4min - Average sunshine in November:
5h and 4min - Average sunshine in December:
4h and 5min
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).
Average sunshine days
Grimes, IA
- Average sunshine days in January:
20.6 days - Average sunshine days in February:
17.8 days - Average sunshine days in March:
17.6 days - Average sunshine days in April:
14.8 days - Average sunshine days in May:
12.5 days - Average sunshine days in June:
11.2 days
- Average sunshine days in July:
14.8 days - Average sunshine days in August:
15.6 days - Average sunshine days in September:
17.8 days - Average sunshine days in October:
21 days - Average sunshine days in November:
22 days - Average sunshine days in December:
22.8 days
The month with the most sunshine days is December (22.8 days).
The month with the least sunshine days is June (11.2 days).
Average UV index
Grimes, IA
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover
Grimes, IA
The month with the most cloud cover is January (Cloud cover 53).
The month with the least cloud cover is September (Cloud cover 28).
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).
Grimes, Iowa, USA
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