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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 another subzero cold winter month in Sully, Iowa, with an average temperature ranging between max 27.1°F (-2.7°C) and min 14.4°F (-9.8°C). Temperature records mark January as the coldest month, with highs averaging 27.1°F (-2.7°C) and lows at 14.4°F (-9.8°C). Weather in January »
Weather in February
The last month of the winter, February, is also a subzero cold month in Sully, Iowa, with an average temperature fluctuating between 17.4°F (-8.1°C) and 31.5°F (-0.3°C). At the start of February, Sully's average high-temperature reaches a still freezing cold 31.5°F (-0.3°C), subtly different from the preceding month. Weather in February »
Weather in March
The first month of the spring, March, is a chilly month in Sully, Iowa, with temperature in the range of an average high of 46.4°F (8°C) and an average low of 31.5°F (-0.3°C). March signals a considerable rise in Sully's average high-temperature, advancing from a freezing cold 31.5°F (-0.3°C) in February to a chilly 46.4°F (8°C). Weather in March »
Weather in April
April is a moderate spring month in Sully, Iowa, with an average temperature varying between 41.9°F (5.5°C) and 58.8°F (14.9°C). The shift into April is characterized by a rise in the average high-temperature, transitioning from March's frosty 46.4°F (8°C) to a refreshing 58.8°F (14.9°C). Weather in April »
Weather in May
May, the last month of the spring in Sully, is a pleasant month, with an average temperature ranging between min 52.5°F (11.4°C) and max 69.3°F (20.7°C). With the onset of May, Sully experiences a temperature shift, with the average high-temperature moving from a refreshing 58.8°F (14.9°C) in April to a pleasant 69.3°F (20.7°C). Weather in May »
Weather in June
June, the first month of the summer in Sully, is a warm month, with temperature in the range of an average high of 79.3°F (26.3°C) and an average low of 62.4°F (16.9°C). The start of June brings a rise in the average high-temperature, moving from a pleasant 69.3°F (20.7°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 Sully, Iowa, with an average temperature ranging between max 81.5°F (27.5°C) and min 64.8°F (18.2°C). July is Sully's warmest month, registering average high temperatures of 81.5°F (27.5°C) and lows of 64.8°F (18.2°C). For July, the heat index is calculated to be a hot 87.8°F (31°C). Weather in July »
Weather in August
August, the last month of the summer in Sully, is another warm month, with temperature in the range of an average low of 62.2°F (16.8°C) and an average high of 80.6°F (27°C). The average high-temperature during August is a still moderately hot 80.6°F (27°C), almost matching the conditions of the preceding month. Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Sully, Iowa, with an average temperature fluctuating between 55.8°F (13.2°C) and 74.7°F (23.7°C). A subtle change in temperatures is noted as August gives way to September, with average highs reducing from 80.6°F (27°C) to a still moderately hot 74.7°F (23.7°C). Weather in September »
Weather in October
October, the same as September, in Sully, Iowa, is another mild autumn month, with temperature in the range of an average high of 59.9°F (15.5°C) and an average low of 44.2°F (6.8°C). A decrease in the average high-temperature marks October, falling from September's warm 74.7°F (23.7°C) to a moderate 59.9°F (15.5°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty month in Sully, Iowa, with an average temperature varying between 32.4°F (0.2°C) and 46.9°F (8.3°C). The onset of November comes with a shift in the average high-temperature, falling from a mild 59.9°F (15.5°C) in October to a chilly 46.9°F (8.3°C). Weather in November »
Weather in December
December, the first month of the winter in Sully, is also a wintry month, with an average temperature fluctuating between 33.8°F (1°C) and 22.1°F (-5.5°C). December indicates a shift in the average high-temperature, from November's chilly 46.9°F (8.3°C) to a cold 33.8°F (1°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 is the coldest month in Sully?
January is the coldest month of the year in Sully, Iowa, registering average temperatures as high as 27.1°F (-2.7°C) and as low as 14.4°F (-9.8°C).
What is the most humid month in Sully?
With an average relative humidity of 84%, January is the most humid month.
What is the driest month in Sully?
The months with the least rainfall in Sully are January, February and December Rain falls for 3.8 days and accumulates 0.39" (10mm) of rain.
How many days does it rain in Sully?
In Sully, during the entire year, the rain falls for 106.7 days and collects up to 11.77" (299mm) of precipitation.
When does it snow in Sully?
January through May, October through December are months with snowfall.
What is the snowiest month in Sully?
January is the month with the most snowfall in Sully. Snow falls for 8.4 days and accumulates 1.73" (44mm) of snow.
How much does it snow in Sully?
Throughout the year, there are 28.8 snowfall days, and 5.28" (134mm) of snow is accumulated.
What is the month with the least sunshine in Sully?
January has the least sunshine of the year in Sully, with an average of 4.2h of sunshine.
What are the months with the lowest UV index in Sully?
January and December, with an average maximum UV index of 1, are months with the lowest UV index in Sully, Iowa.
When is Daylight Saving Time (DST) in Sully?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Sully, Iowa, 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 rainiest month in Sully?
May is the month with the most rainfall in Sully, Iowa. Rain falls for 14.7 days and accumulates 2.13" (54mm) of precipitation.
When it does not snow in Sully?
In Sully, Iowa, snow does not fall in June through September.
When are the longest days in Sully?
The month with the longest days is June, with an average of 15h and 6min of daylight.
What is the month with the highest UV index in Sully?
The months with the highest UV index in Sully, Iowa, are June and July, with an average maximum UV index of 6.
What is the hottest time of year in Sully?
Sully witnesses the warmest weather in July, with temperatures averaging a high of 81.5°F (27.5°C) and a low of 64.8°F (18.2°C).
What month has the most sunshine in Sully?
July has the most sunshine of the year, with an average of 10.3h of sunshine.
What is the least humid month in Sully?
October is the least humid month in Sully, Iowa, with an average relative humidity of 71%.
What is the month with the shortest days in Sully?
With an average of 9h and 12min of daylight, December has the shortest days of the year in Sully, Iowa.
Average temperature
Sully, IA
The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (27.1°F).
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (14.4°F).
Average pressure
Sully, IA
- Average pressure in January:
30.15"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:
29.89"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
Sully, IA
- Average wind speed in January:
10.5mph - Average wind speed in February:
10.4mph - Average wind speed in March:
10.4mph - Average wind speed in April:
10.6mph - Average wind speed in May:
9mph - Average wind speed in June:
8mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity
Sully, IA
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Sully, IA
- Average rainfall in January:
0.39" - Average rainfall in February:
0.39" - Average rainfall in March:
0.75" - Average rainfall in April:
1.02" - Average rainfall in May:
2.13" - Average rainfall in June:
1.85"
The wettest month (with the highest rainfall) is May (2.13").
The driest months (with the least rainfall) are January, February and December (0.39").
Average rainfall days
Sully, IA
- Average rainfall days in January:
3.8 days - Average rainfall days in February:
3.4 days - Average rainfall days in March:
8.8 days - Average rainfall days in April:
11.1 days - Average rainfall days in May:
14.7 days - Average rainfall days in June:
14.5 days
- Average rainfall days in July:
12.9 days - Average rainfall days in August:
10.7 days - Average rainfall days in September:
9.6 days - Average rainfall days in October:
7 days - Average rainfall days in November:
5.9 days - Average rainfall days in December:
4.3 days
The month with the highest number of rainy days is May (14.7 days).
The month with the least rainy days is February (3.4 days).
Average snowfall
Sully, IA
- Average snowfall in January:
1.73" - Average snowfall in February:
1.54" - Average snowfall in March:
0.79" - Average snowfall in April:
0.24" - Average snowfall in May:
0.04" - Average snowfall in June:
0"
The month with the highest snowfall is January (1.73").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Sully, IA
- Average snowfall days in January:
8.4 days - Average snowfall days in February:
7.3 days - Average snowfall days in March:
4.9 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:
0.5 days - Average snowfall days in November:
1.7 days - Average snowfall days in December:
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
Sully, 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 1min
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 12min).
- Average sunshine in January:
4h and 1min - Average sunshine in February:
4h and 3min - Average sunshine in March:
6h and 1min - Average sunshine in April:
8h and 0min - Average sunshine in May:
8h and 4min - 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 4min - Average sunshine in November:
5h and 3min - 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
Sully, IA
- Average sunshine days in January:
21.8 days - Average sunshine days in February:
19.1 days - Average sunshine days in March:
18.3 days - Average sunshine days in April:
16.5 days - Average sunshine days in May:
13.6 days - Average sunshine days in June:
12.2 days
- Average sunshine days in July:
14.8 days - Average sunshine days in August:
17.2 days - Average sunshine days in September:
18.1 days - Average sunshine days in October:
21.6 days - Average sunshine days in November:
22.2 days - Average sunshine days in December:
22.9 days
The month with the most sunshine days is December (22.9 days).
The month with the least sunshine days is June (12.2 days).
Average UV index
Sully, IA
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover
Sully, IA
The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are July and September (Cloud cover 30).
Average visibility
Sully, IA
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Sully, Iowa, USA
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