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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 Delta, Iowa, is a freezing cold winter month, with an average temperature fluctuating between 15.6°F (-9.1°C) and 28.6°F (-1.9°C). January, on average, is the coldest month, registering a high temperature of 28.6°F (-1.9°C) and a low of 15.6°F (-9.1°C). Weather in January »
Weather in February
February, the last month of the winter in Delta, is a cold month, with an average temperature varying between 32.5°F (0.3°C) and 19°F (-7.2°C). The advent of February signifies a minor shift to an average high-temperature of a cold 32.5°F (0.3°C), aligning closely with January. Weather in February »
Weather in March
March, the first month of the spring in Delta, is a chilly month, with an average temperature varying between 47.1°F (8.4°C) and 32.4°F (0.2°C). As Delta steps into March, a marked temperature rise is observed, with the average high-temperature advancing from February's icy 32.5°F (0.3°C) to a frosty 47.1°F (8.4°C). Weather in March »
Weather in April
April in Delta, Iowa, is a moderate spring month, with temperature in the range of an average low of 42.4°F (5.8°C) and an average high of 59.5°F (15.3°C). As March gives way to April, the average high-temperature displays an increase, moving from a chilly 47.1°F (8.4°C) to a mild 59.5°F (15.3°C). Weather in April »
Weather in May
The last month of the spring, May, is a pleasant month in Delta, Iowa, with an average temperature varying between 53.2°F (11.8°C) and 70°F (21.1°C). The transition to May introduces an increase in the average high-temperature, shifting from a refreshing 59.5°F (15.3°C) in April to a pleasant 70°F (21.1°C). Weather in May »
Weather in June
June, the first month of the summer in Delta, is a moderately hot month, with an average temperature fluctuating between 63.1°F (17.3°C) and 79.3°F (26.3°C). The shift into June is characterized by a rise in the average high-temperature, transitioning from May's pleasant 70°F (21.1°C) to a moderately hot 79.3°F (26.3°C). Weather in June »
Weather in July
July, like June, in Delta, Iowa, is a moderately hot summer month, with an average temperature fluctuating between 82°F (27.8°C) and 65.1°F (18.4°C). In Delta, Iowa, July is the warmest month, with temperatures averaging a high of 82°F (27.8°C) and a low of 65.1°F (18.4°C). In July, the heat index is computed to be a tropical 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 Delta, Iowa, with an average temperature ranging between min 62.8°F (17.1°C) and max 81.1°F (27.3°C). The shift into August reveals an average high-temperature of a still moderately hot 81.1°F (27.3°C), closely mirroring July's climate. Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Delta, Iowa, with temperature in the range of an average high of 75.2°F (24°C) and an average low of 56.3°F (13.5°C). Delta experiences a moderate temperature shift at the start of September, with average high-temperatures adjusting a bit from a warm 81.1°F (27.3°C) in August to a still moderately hot 75.2°F (24°C). Weather in September »
Weather in October
October, like September, in Delta, Iowa, is another refreshing autumn month, with an average temperature varying between 61.3°F (16.3°C) and 44.8°F (7.1°C). October shows a mild decline in the average high-temperature, falling from September's warm 75.2°F (24°C) to a refreshing 61.3°F (16.3°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty month in Delta, Iowa, with an average temperature varying between 33.4°F (0.8°C) and 46.9°F (8.3°C). November's arrival witnesses a distinct drop in the average high-temperature, receding from October's enjoyable 61.3°F (16.3°C) to a chilly 46.9°F (8.3°C). Weather in November »
Weather in December
December, the first month of the winter in Delta, is also an icy month, with an average temperature varying between 34.7°F (1.5°C) and 23.4°F (-4.8°C). As December commences, the average high-temperature shows a reduction, transitioning from a frosty 46.9°F (8.3°C) in November to an icy 34.7°F (1.5°C). Weather in December »
Updated: Feb 12, 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 are the coldest months in Delta?
January is the coldest month in Delta, with an average high-temperature of 28.6°F (-1.9°C) and an average low-temperature of 15.6°F (-9.1°C).
How much does it rain in Delta?
Throughout the year, in Delta, there are 137.9 rainfall days, and 27.76" (705mm) of precipitation is accumulated.
When does it snow in Delta?
January through May, October through December are months with snowfall in Delta, Iowa.
What is the snowiest month in Delta?
The month with the most snowfall in Delta is January, when snow falls for 9.5 days and typically aggregates up to 4.06" (103mm) of snow.
How much does it snow in Delta?
Throughout the year, there are 32.8 snowfall days, and 12.56" (319mm) of snow is accumulated.
What is the month with the least sunshine in Delta?
With an average of 4.2h of sunshine, January has the least sunshine of the year in Delta, Iowa.
When is the lowest UV index in Delta?
The months with the lowest UV index in Delta, Iowa, are January, February, October through December, with an average maximum UV index of 2.
What is the driest month in Delta?
The month with the least rainfall is February, when the rain falls for 4.9 days and typically collects 0.98" (25mm) of precipitation.
When is Daylight Saving Time (DST) in Delta?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Delta, 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 Delta?
The month with the most rainfall in Delta, Iowa, is May, when the rain falls for 17.7 days and typically aggregates up to 4.17" (106mm) of precipitation.
When it does not snow in Delta?
In Delta, Iowa, snow does not fall in June through September.
When are the longest days in Delta?
With an average of 15h and 6min of daylight, June has the longest days of the year in Delta.
When is the highest UV index in Delta?
June and July, with an average maximum UV index of 6, are months with the highest UV index in Delta.
What is the hottest time of year in Delta?
July is Delta's warmest month, registering average high temperatures of 82°F (27.8°C) and lows of 65.1°F (18.4°C).
What is the most humid month in Delta?
July is the most humid month in Delta, Iowa, with an average relative humidity of 83%.
What month has the most sunshine in Delta?
The month with the most sunshine in Delta is July, with an average of 10.3h of sunshine.
What is the least humid month in Delta?
With an average relative humidity of 72%, October is the least humid month.
What is the month with the shortest days in Delta?
With an average of 9h and 18min of daylight, December has the shortest days of the year in Delta, Iowa.
Average temperature
Delta, IA
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (28.6°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 (15.6°F).
Average pressure
Delta, IA
- Average pressure in January:
30.15"Hg - Average pressure in February:
30.13"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.94"Hg - Average pressure in June:
29.89"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.97"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed
Delta, IA
- Average wind speed in January:
10.7mph - Average wind speed in February:
10.5mph - Average wind speed in March:
10.5mph - Average wind speed in April:
10.6mph - Average wind speed in May:
8.9mph - Average wind speed in June:
7.8mph
- Average wind speed in July:
7mph - Average wind speed in August:
6.9mph - Average wind speed in September:
8mph - Average wind speed in October:
9.6mph - Average wind speed in November:
10.4mph - Average wind speed in December:
10.1mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is August (6.9mph).
Average humidity
Delta, IA
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Delta, IA
- Average rainfall in January:
1.06" - Average rainfall in February:
0.98" - Average rainfall in March:
1.97" - Average rainfall in April:
2.87" - Average rainfall in May:
4.17" - Average rainfall in June:
4.02"
- Average rainfall in July:
2.76" - Average rainfall in August:
2.24" - Average rainfall in September:
2.76" - Average rainfall in October:
2.2" - Average rainfall in November:
1.54" - Average rainfall in December:
1.18"
The wettest month (with the highest rainfall) is May (4.17").
The driest month (with the least rainfall) is February (0.98").
Average rainfall days
Delta, IA
- Average rainfall days in January:
5.8 days - Average rainfall days in February:
4.9 days - Average rainfall days in March:
11 days - Average rainfall days in April:
14.7 days - Average rainfall days in May:
17.7 days - Average rainfall days in June:
17.2 days
- Average rainfall days in July:
15.8 days - Average rainfall days in August:
12.3 days - Average rainfall days in September:
12.1 days - Average rainfall days in October:
11.3 days - Average rainfall days in November:
8.3 days - Average rainfall days in December:
6.8 days
The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is February (4.9 days).
Average snowfall
Delta, IA
- Average snowfall in January:
4.06" - Average snowfall in February:
3.66" - Average snowfall in March:
1.34" - Average snowfall in April:
0.79" - Average snowfall in May:
0.04" - Average snowfall in June:
0"
The month with the highest snowfall is January (4.06").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Delta, IA
- Average snowfall days in January:
9.5 days - Average snowfall days in February:
8.4 days - Average snowfall days in March:
4.6 days - Average snowfall days in April:
0.8 days - Average snowfall days in May:
0.1 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:
0.5 days - Average snowfall days in November:
2.4 days - Average snowfall days in December:
6.5 days
The month with the highest number of snowfall days is January (9.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Delta, 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 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 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 1min - Average sunshine in February:
4h and 2min - Average sunshine in March:
6h and 3min - Average sunshine in April:
8h and 0min - Average sunshine in May:
8h and 4min - 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 4min
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 12min).
Average sunshine days
Delta, IA
- Average sunshine days in January:
16.6 days - Average sunshine days in February:
15.6 days - Average sunshine days in March:
15.3 days - Average sunshine days in April:
12.5 days - Average sunshine days in May:
11 days - Average sunshine days in June:
10.3 days
- Average sunshine days in July:
11.9 days - Average sunshine days in August:
15.5 days - Average sunshine days in September:
15.9 days - Average sunshine days in October:
17.9 days - Average sunshine days in November:
18.7 days - Average sunshine days in December:
19.1 days
The month with the most sunshine days is December (19.1 days).
The month with the least sunshine days is June (10.3 days).
Average UV index
Delta, IA
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover
Delta, IA
The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are August and September (Cloud cover 29).
Average visibility
Delta, 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).