Climate and monthly weather forecast
Sunbury, IA

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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

Frequently asked questions

What month is the coldest in Sunbury?

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).

What is the most humid month in Sunbury?

The months with the highest humidity in Sunbury are January and July, with an average relative humidity of 83%.

How much does it rain in Sunbury?

In Sunbury, during the entire year, the rain falls for 136.9 days and collects up to 27.95" (710mm) of precipitation.

When does it snow in Sunbury?

January through April, October through December are months with snowfall.

When does it snow the most in Sunbury?

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.

How many days does it snow in Sunbury?

Throughout the year, in Sunbury, Iowa, there are 35.1 snowfall days, and 12.8" (325mm) of snow is accumulated.

What is the month with the least sunshine in Sunbury?

The month with the least sunshine in Sunbury is January, with an average of 4h of sunshine.

What are the months with the lowest UV index in Sunbury?

January and December, with an average maximum UV index of 1, are months with the lowest UV index in Sunbury.

What is the driest month in Sunbury?

February is the month with the least rainfall. Rain falls for 5.1 days and accumulates 1.1" (28mm) of precipitation.

When is Daylight Saving Time (DST) in Sunbury?

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 rainiest month in Sunbury?

May is the month with the most rainfall. Rain falls for 17.5 days and accumulates 4.57" (116mm) of precipitation.

When it does not snow in Sunbury?

May through September are months without snowfall in Sunbury, Iowa.

When are the longest days in Sunbury?

June has the longest days of the year in Sunbury, Iowa, with an average of 15h and 12min of daylight.

What month is the hottest in Sunbury?

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.

What month has the most sunshine in Sunbury?

The month with the most sunshine in Sunbury is July, with an average of 10.1h of sunshine.

What is the month with the highest UV index in Sunbury?

With an average maximum UV index of 6, July is the month with the highest UV index in Sunbury.

What is the least humid month in Sunbury?

October is the least humid month in Sunbury, Iowa, with an average relative humidity of 72%.

What is the month with the shortest days in Sunbury?

With an average of 9h and 12min of daylight, December has the shortest days of the year in Sunbury.

Average temperature
Sunbury, IA

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 - Sunbury, IA

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 - Sunbury, IA

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

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 - Sunbury, IA

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 - Sunbury, IA

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

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 - Sunbury, IA

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 / Average sunshine - Sunbury, IA

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).

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 - Sunbury, IA

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 visibility
Sunbury, IA

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).

Sunbury, Iowa, USA

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