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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
Climate and monthly weather forecast
Weather in January
January, the same as December, in Diagonal, Iowa, is a freezing cold winter month, with an average temperature fluctuating between 16.9°F (-8.4°C) and 30.6°F (-0.8°C). January, with its average high-temperature of 30.6°F (-0.8°C) and an average low-temperature of 16.9°F (-8.4°C), holds the record as the coldest month. Weather in January »
Weather in February
February, the last month of the winter in Diagonal, is a cold month, with temperature in the range of an average low of 20.1°F (-6.6°C) and an average high of 34.2°F (1.2°C). As January transitions into February, the average high-temperature rests at a cold 34.2°F (1.2°C), maintaining a close resemblance to the previous month. Weather in February »
Weather in March
March, the first month of the spring in Diagonal, is a frosty month, with an average temperature varying between 48.7°F (9.3°C) and 33.3°F (0.7°C). The start of March brings a distinct shift in the average high-temperature, escalating from February's cold 34.2°F (1.2°C) to a frosty 48.7°F (9.3°C). Weather in March »
Weather in April
April in Diagonal, Iowa, is a mild spring month, with an average temperature ranging between max 60.4°F (15.8°C) and min 42.6°F (5.9°C). A rise in the average high-temperature is observed during April, moving from a frosty 48.7°F (9.3°C) in March to a moderate 60.4°F (15.8°C). Weather in April »
Weather in May
May, the last month of the spring in Diagonal, is a pleasant month, with an average temperature varying between 69.6°F (20.9°C) and 53.1°F (11.7°C). Diagonal's May weather brings a rise in high-temperatures, moving from a mild 60.4°F (15.8°C) in April to a pleasant 69.6°F (20.9°C). Weather in May »
Weather in June
June, the first month of the summer in Diagonal, is a warm month, with an average temperature ranging between min 63.3°F (17.4°C) and max 79.9°F (26.6°C). As June sets, the average high-temperature shows an increase, moving up from an agreeable 69.6°F (20.9°C) in May to a moderately hot 79.9°F (26.6°C). Weather in June »
Weather in July
July, like June, in Diagonal, Iowa, is a moderately hot summer month, with an average temperature varying between 83.5°F (28.6°C) and 66°F (18.9°C). Diagonal's warmest month, July, generally records average temperatures ranging from a high of 83.5°F (28.6°C) to a low of 66°F (18.9°C). For most parts of July, the heat index is appraised at a hot 93.2°F (34°C). Weather in July »
Weather in August
August, the last month of the summer in Diagonal, is also a moderately hot month, with temperature in the range of an average high of 81.7°F (27.6°C) and an average low of 63.3°F (17.4°C). August's climate shows a minor adjustment in average high-temperatures to a still moderately hot 81.7°F (27.6°C) from July's 83.5°F (28.6°C). Weather in August »
Weather in September
September, the first month of the autumn in Diagonal, is also a moderately hot month, with an average temperature ranging between min 56.3°F (13.5°C) and max 75.9°F (24.4°C). With the arrival of September, Diagonal experiences a modest decline in average high-temperatures, transitioning from 81.7°F (27.6°C) in August to a still warm 75.9°F (24.4°C). Weather in September »
Weather in October
October, the same as September, is another refreshing autumn month in Diagonal, Iowa, with an average temperature fluctuating between 61.5°F (16.4°C) and 44.6°F (7°C). The start of October brings a distinct shift in the average high-temperature, dropping from September's warm 75.9°F (24.4°C) to a comfortable 61.5°F (16.4°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty month in Diagonal, Iowa, with an average temperature ranging between max 48.4°F (9.1°C) and min 33.1°F (0.6°C). November weather is marked by a drop in the average high-temperature, falling from a comfortable 61.5°F (16.4°C) in October to a chilly 48.4°F (9.1°C). Weather in November »
Weather in December
The first month of the winter, December, is also an icy month in Diagonal, Iowa, with an average temperature ranging between max 35.2°F (1.8°C) and min 23.2°F (-4.9°C). The onset of December results in a decrease in the average high-temperature, receding from a frosty 48.4°F (9.1°C) in November to a cold 35.2°F (1.8°C). Weather in December »
Updated: Jul 21, 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 is the coldest month?
Diagonal's January weather, marked by an average high temperature of 30.6°F (-0.8°C) and an average low temperature of 16.9°F (-8.4°C), is the coldest in the year.
How many days does it rain?
Throughout the year, in Diagonal, there are 126.9 rainfall days, and 22.6" (574mm) of precipitation is accumulated.
When does it snow?
Months with snowfall are January through May, October through December.
When does it snow the most in Diagonal?
The month with the most snowfall is January, when snow falls for 8.4 days and typically aggregates up to 3.54" (90mm) of snow.
How many days does it snow?
Throughout the year, there are 28.7 snowfall days, and 11.85" (301mm) of snow is accumulated.
What is the month with the least sunshine?
January has the least sunshine of the year, with an average of 4.6h of sunshine.
When is the lowest UV index in Diagonal?
With an average maximum UV index of 1, January is the month with the lowest UV index.
What is the driest month?
The months with the least rainfall are February and December Rain falls for 4.7 days and accumulates 0.71" (18mm) of rain.
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 most humid month?
With an average relative humidity of 82%, June is the most humid month.
What is the wettest month?
June is the month with the most rainfall. Rain falls for 16.1 days and accumulates 3.86" (98mm) of precipitation.
When it does not snow?
In Diagonal, snow does not fall in June through September.
When are the longest days?
With an average of 15h and 6min of daylight, June has the longest days of the year.
What are the months with the highest UV index?
June through August, with an average maximum UV index of 6, are months with the highest UV index.
What part of the year is the hottest in Diagonal?
July is the month when Diagonal's temperatures reach their peak, with averages of 83.5°F (28.6°C) and lows of 66°F (18.9°C).
What month has the most sunshine?
July has the most sunshine of the year, with an average of 10.3h of sunshine.
What is the least humid month?
With an average relative humidity of 71%, October is the least humid month.
What is the month with the shortest days?
The month with the shortest days is December, with an average of 9h and 18min of daylight.
Average temperature
Diagonal, IA
The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is January (30.6°F).
The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (16.9°F).
Average pressure
Diagonal, IA
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.14"Hg - Average pressure in March:
30.06"Hg - Average pressure in April:
29.92"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:
30.13"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
Diagonal, 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:
10.2mph - Average wind speed in May:
8.5mph - Average wind speed in June:
7.9mph
- Average wind speed in July:
6.8mph - Average wind speed in August:
6.8mph - Average wind speed in September:
7.8mph - Average wind speed in October:
9.3mph - Average wind speed in November:
10.1mph - Average wind speed in December:
9.9mph
The windiest months (with the highest average wind speed) are January, February and March (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).
Average humidity
Diagonal, IA
The month with the highest relative humidity is June (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Diagonal, IA
- Average rainfall in January:
0.75" - Average rainfall in February:
0.71" - Average rainfall in March:
1.54" - Average rainfall in April:
1.93" - Average rainfall in May:
3.46" - Average rainfall in June:
3.86"
- Average rainfall in July:
2.32" - Average rainfall in August:
2.32" - Average rainfall in September:
2.24" - Average rainfall in October:
1.65" - Average rainfall in November:
1.1" - Average rainfall in December:
0.71"
The wettest month (with the highest rainfall) is June (3.86").
The driest months (with the least rainfall) are February and December (0.71").
Average rainfall days
Diagonal, IA
- Average rainfall days in January:
4.1 days - Average rainfall days in February:
4.7 days - Average rainfall days in March:
10.1 days - Average rainfall days in April:
13.1 days - Average rainfall days in May:
17.8 days - Average rainfall days in June:
16.1 days
- Average rainfall days in July:
15.1 days - Average rainfall days in August:
13.3 days - Average rainfall days in September:
11 days - Average rainfall days in October:
9.5 days - Average rainfall days in November:
6.7 days - Average rainfall days in December:
5.4 days
The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is January (4.1 days).
Average snowfall
Diagonal, IA
The month with the highest snowfall is January (3.54").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Diagonal, IA
- Average snowfall days in January:
8.4 days - Average snowfall days in February:
7.4 days - Average snowfall days in March:
3.6 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:
0.8 days - Average snowfall days in November:
1.7 days - Average snowfall days in December:
5.8 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
Diagonal, 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 3min - Average daylight in June:
15h and 1min
- Average daylight in July:
14h and 5min - Average daylight in August:
13h and 4min - 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 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in January:
4h and 4min - Average sunshine in February:
5h and 1min - Average sunshine in March:
6h and 1min - Average sunshine in April:
8h and 1min - Average sunshine in May:
8h and 3min - Average sunshine in June:
9h and 4min
- 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 5min - Average sunshine in November:
5h and 4min - Average sunshine in December:
5h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days
Diagonal, IA
- Average sunshine days in January:
20 days - Average sunshine days in February:
16.8 days - Average sunshine days in March:
15.8 days - Average sunshine days in April:
14.3 days - Average sunshine days in May:
10.6 days - Average sunshine days in June:
11.1 days
- Average sunshine days in July:
11.5 days - Average sunshine days in August:
14.5 days - Average sunshine days in September:
16.9 days - Average sunshine days in October:
19.2 days - Average sunshine days in November:
21.2 days - Average sunshine days in December:
20.5 days
The month with the most sunshine days is November (21.2 days).
The month with the least sunshine days is May (10.6 days).
Average UV index
Diagonal, IA
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover
Diagonal, IA
The month with the most cloud cover is January (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility
Diagonal, IA
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).