Climate and monthly weather forecastSunbury, IA
Climate and monthly weather forecast
Weather in January
January, like December, is a freezing cold winter month in Sunbury, Iowa, with temperature in the range of an average high of 27.7°F (-2.4°C) and an average low of 15.3°F (-9.3°C). January proves to be the coldest month, recording an average maximum temperature of 27.7°F (-2.4°C) and a minimum temperature of 15.3°F (-9.3°C). Weather in January »Weather in February
February, the last month of the winter in Sunbury, is an icy month, with temperature in the range of an average low of 19.4°F (-7°C) and an average high of 32.4°F (0.2°C). As Sunbury welcomes February, the average high-temperature records at an icy 32.4°F (0.2°C), marking an insignificant deviation from the prior month. Weather in February »Weather in March
The first month of the spring, March, is a frosty month in Sunbury, Iowa, with temperature in the range of an average high of 46.6°F (8.1°C) and an average low of 31.8°F (-0.1°C). The beginning of March signals a rise in the average high-temperature, moving from a wintry 32.4°F (0.2°C) in February to a chilly 46.6°F (8.1°C). Weather in March »Weather in April
April in Sunbury, Iowa, is a mild spring month, with an average temperature varying between 42.4°F (5.8°C) and 58.6°F (14.8°C). The beginning of April signals a rise in the average high-temperature, moving from a frosty 46.6°F (8.1°C) in March to a mild 58.6°F (14.8°C). Weather in April »Weather in May
The last month of the spring, May, is a pleasant month in Sunbury, Iowa, with an average temperature varying between 53.2°F (11.8°C) and 69.8°F (21°C). The beginning of May marks a shift in the average high-temperature, moving from April's refreshing 58.6°F (14.8°C) to an agreeable 69.8°F (21°C). Weather in May »Weather in June
The first month of the summer, June, is a warm month in Sunbury, Iowa, with an average temperature varying between 78.8°F (26°C) and 61.9°F (16.6°C). Sunbury's transition into June is marked by a rise in the average high-temperature, advancing from a pleasant 69.8°F (21°C) in May to a moderately hot 78.8°F (26°C). Weather in June »Weather in July
July, like June, in Sunbury, Iowa, is a moderately hot summer month, with an average temperature ranging between max 81.1°F (27.3°C) and min 64.6°F (18.1°C). July, with its high-temperature average of 81.1°F (27.3°C) and a low-temperature average of 64.6°F (18.1°C), is the warmest month. Throughout July, the heat index is calculated to be a hot 87.8°F (31°C). Weather in July »Weather in August
The last month of the summer, August, is another warm month in Sunbury, Iowa, with temperature in the range of an average low of 62.6°F (17°C) and an average high of 80.2°F (26.8°C). A minor adjustment in Sunbury's average high-temperature is noted with the start of August, touching a still moderately hot 80.2°F (26.8°C) from July's 81.1°F (27.3°C). Weather in August »Weather in September
The first month of the autumn, September, is also a moderately hot month in Sunbury, Iowa, with an average temperature ranging between min 55.9°F (13.3°C) and max 75.2°F (24°C). The arrival of September denotes a barely perceptible change in the average high-temperatures to a still warm 75.2°F (24°C) from August's 80.2°F (26.8°C). Weather in September »Weather in October
October, like September, in Sunbury, Iowa, is another comfortable autumn month, with an average temperature ranging between max 60.8°F (16°C) and min 44.6°F (7°C). October signals a considerable drop in Sunbury's average high-temperature, reducing from a moderately hot 75.2°F (24°C) in September to an enjoyable 60.8°F (16°C). Weather in October »Weather in November
November, the last month of the autumn in Sunbury, is also a frosty month, with temperature in the range of an average high of 46.4°F (8°C) and an average low of 32.9°F (0.5°C). Sunbury witnesses a significant decrease in the average high-temperature with the arrival of November, falling from October's comfortable 60.8°F (16°C) to a chilly 46.4°F (8°C). Weather in November »Weather in December
The first month of the winter, December, is still a cold month in Sunbury, Iowa, with temperature in the range of an average high of 34°F (1.1°C) and an average low of 23.2°F (-4.9°C). Observing a mild shift, the average high-temperature during December reduces from November's chilly 46.4°F (8°C) to an icy 34°F (1.1°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
In Sunbury, Iowa, the lowest temperatures are generally noted in January, averaging a high of 27.7°F (-2.4°C) and a low of 15.3°F (-9.3°C).
The months with the highest humidity in Sunbury are January and July, with an average relative humidity of 83%.
In Sunbury, during the entire year, the rain falls for 136.9 days and collects up to 27.95" (710mm) of precipitation.
January through April, October through December are months with snowfall.
The month with the most snowfall in Sunbury is January, when snow falls for 11.3 days and typically aggregates up to 4.09" (104mm) of snow.
Throughout the year, in Sunbury, Iowa, there are 35.1 snowfall days, and 12.8" (325mm) of snow is accumulated.
The month with the least sunshine in Sunbury is January, with an average of 4h of sunshine.
January and December, with an average maximum UV index of 1, are months with the lowest UV index in Sunbury.
February is the month with the least rainfall. Rain falls for 5.1 days and accumulates 1.1" (28mm) of precipitation.
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.
May is the month with the most rainfall. Rain falls for 17.5 days and accumulates 4.57" (116mm) of precipitation.
May through September are months without snowfall in Sunbury, Iowa.
June has the longest days of the year in Sunbury, Iowa, with an average of 15h and 12min of daylight.
July registers as the month with the average highest temperatures, reaching 81.1°F (27.3°C) at its peak and 64.6°F (18.1°C) at the lowest.
The month with the most sunshine in Sunbury is July, with an average of 10.1h of sunshine.
With an average maximum UV index of 6, July is the month with the highest UV index in Sunbury.
October is the least humid month in Sunbury, Iowa, with an average relative humidity of 72%.
With an average of 9h and 12min of daylight, December has the shortest days of the year in Sunbury.
Average temperature
Sunbury, IA
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (27.7°F).
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (15.3°F).
Average pressure
Sunbury, IA
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.94"Hg - Average pressure in June:
29.9"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 (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed
Sunbury, IA
- Average wind speed in January:
10.4mph - 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:
7.8mph
- Average wind speed in July:
6.8mph - Average wind speed in August:
6.8mph - Average wind speed in September:
7.9mph - Average wind speed in October:
9.6mph - Average wind speed in November:
10.3mph - Average wind speed in December:
9.9mph
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 (6.8mph).
Average humidity
Sunbury, IA
The months with the highest relative humidity are January and July (83%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Sunbury, IA
- Average rainfall in January:
1.3" - Average rainfall in February:
1.1" - Average rainfall in March:
1.85" - Average rainfall in April:
3.03" - Average rainfall in May:
4.57" - Average rainfall in June:
3.7"
The wettest month (with the highest rainfall) is May (4.57").
The driest month (with the least rainfall) is February (1.1").
Average rainfall days
Sunbury, IA
- Average rainfall days in January:
4.3 days - Average rainfall days in February:
5.1 days - Average rainfall days in March:
11.4 days - Average rainfall days in April:
15.8 days - Average rainfall days in May:
17.5 days - Average rainfall days in June:
16.8 days
- Average rainfall days in July:
15.2 days - Average rainfall days in August:
12.6 days - Average rainfall days in September:
11 days - Average rainfall days in October:
11.5 days - Average rainfall days in November:
8.5 days - Average rainfall days in December:
7.2 days
The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (4.3 days).
Average snowfall
Sunbury, IA
The month with the highest snowfall is January (4.09").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Sunbury, IA
- Average snowfall days in January:
11.3 days - Average snowfall days in February:
8.8 days - Average snowfall days in March:
4.4 days - Average snowfall days in April:
0.8 days - Average snowfall days in May:
0 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:
2.5 days - Average snowfall days in December:
6.8 days
The month with the highest number of snowfall days is January (11.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Sunbury, IA
- Average daylight in January:
9h and 36min - Average daylight in February:
10h and 36min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 24min - Average daylight in May:
14h and 36min - Average daylight in June:
15h and 12min
- Average daylight in July:
14h and 48min - Average daylight in August:
13h and 48min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 6min - Average daylight in November:
9h and 48min - Average daylight in December:
9h and 12min
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 0min - Average sunshine in February:
4h and 12min - Average sunshine in March:
6h and 30min - Average sunshine in April:
7h and 48min - Average sunshine in May:
8h and 48min - Average sunshine in June:
9h and 48min
- Average sunshine in July:
10h and 6min - Average sunshine in August:
10h and 0min - Average sunshine in September:
9h and 18min - Average sunshine in October:
5h and 24min - Average sunshine in November:
5h and 18min - Average sunshine in December:
4h and 18min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days
Sunbury, IA
- Average sunshine days in January:
16.3 days - Average sunshine days in February:
14.8 days - Average sunshine days in March:
15.3 days - Average sunshine days in April:
12.5 days - Average sunshine days in May:
11.4 days - Average sunshine days in June:
11.4 days
- Average sunshine days in July:
13.8 days - Average sunshine days in August:
16.1 days - Average sunshine days in September:
17 days - Average sunshine days in October:
17.6 days - Average sunshine days in November:
17.9 days - Average sunshine days in December:
18.4 days
The month with the most sunshine days is December (18.4 days).
The months with the least sunshine days are May and June (11.4 days).
Average UV index
Sunbury, IA
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover
Sunbury, IA
The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility
Sunbury, 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).
