Climate and monthly weather forecast
Harpers Ferry, IA

Weather in January

January, like December, is another subzero cold winter month in Harpers Ferry, Iowa, with an average temperature fluctuating between 10.6°F (-11.9°C) and 23.2°F (-4.9°C). January is the coldest month, with an average high-temperature of 23.2°F (-4.9°C) and an average low-temperature of 10.6°F (-11.9°C). Weather in January »

Weather in February

The last month of the winter, February, is also a subzero cold month in Harpers Ferry, Iowa, with temperature in the range of an average high of 27°F (-2.8°C) and an average low of 13.5°F (-10.3°C). In February, the average high-temperature is relatively the same as in January - a still freezing cold 27°F (-2.8°C). Weather in February »

Weather in March

The first month of the spring, March, is a wintry month in Harpers Ferry, Iowa, with an average temperature fluctuating between 26.8°F (-2.9°C) and 42.1°F (5.6°C). In Harpers Ferry, the average high-temperature in March soars, from a freezing cold 27°F (-2.8°C) in February, to a wintry 42.1°F (5.6°C). Weather in March »

Weather in April

April is a fresh spring month in Harpers Ferry, Iowa, with an average temperature varying between 54.7°F (12.6°C) and 37.4°F (3°C). In Harpers Ferry, the average high-temperature in April rises from a cold 42.1°F (5.6°C) in March to a fresh 54.7°F (12.6°C). Weather in April »

Weather in May

May, the last month of the spring in Harpers Ferry, is a comfortable month, with an average temperature fluctuating between 66.6°F (19.2°C) and 48.6°F (9.2°C). In Harpers Ferry, the average high-temperature in May rises from a cool 54.7°F (12.6°C) in April to a comfortable 66.6°F (19.2°C). Weather in May »

Weather in June

The first month of the summer, June, is a warm month in Harpers Ferry, Iowa, with temperature in the range of an average high of 75.9°F (24.4°C) and an average low of 58.1°F (14.5°C). In June, the average high-temperature increases from an enjoyable 66.6°F (19.2°C) in May to a moderately hot 75.9°F (24.4°C). Weather in June »

Weather in July

July, like June, in Harpers Ferry, Iowa, is another warm summer month, with an average temperature varying between 79.9°F (26.6°C) and 61.9°F (16.6°C). With an average high-temperature of 79.9°F (26.6°C) and an average low-temperature of 61.9°F (16.6°C), July is the warmest month. Weather in July »

Weather in August

August, the last month of the summer in Harpers Ferry, is another warm month, with an average temperature fluctuating between 59.4°F (15.2°C) and 78.6°F (25.9°C). In Harpers Ferry, the average high-temperature in August is essentially the same as in July - a still moderately hot 78.6°F (25.9°C). Weather in August »

Weather in September

September, the first month of the autumn in Harpers Ferry, is also an agreeable month, with an average temperature ranging between min 52.2°F (11.2°C) and max 71.8°F (22.1°C). In September, the average high-temperature slightly decreases from a moderately hot 78.6°F (25.9°C) in August to a pleasant 71.8°F (22.1°C). Weather in September »

Weather in October

October, the same as September, in Harpers Ferry, Iowa, is a moderate autumn month, with an average temperature ranging between min 41.5°F (5.3°C) and max 57.7°F (14.3°C). In Harpers Ferry, the average high-temperature in October decreases from a pleasant 71.8°F (22.1°C) in September to a mild 57.7°F (14.3°C). Weather in October »

Weather in November

November, the last month of the autumn in Harpers Ferry, is another chilly month, with an average temperature varying between 29.7°F (-1.3°C) and 43°F (6.1°C). In November, the average high-temperature significantly decreases from a mild 57.7°F (14.3°C) in October to a chilly 43°F (6.1°C). Weather in November »

Weather in December

December, the first month of the winter in Harpers Ferry, is still a freezing cold month, with an average temperature ranging between max 29.8°F (-1.2°C) and min 19°F (-7.2°C). In December, the average high-temperature decreases from a frosty 43°F (6.1°C) in November to a subzero cold 29.8°F (-1.2°C). Weather in December »
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FAQ

What is the coldest month in Harpers Ferry?

The coldest month in Harpers Ferry is January, with an average high-temperature of 23.2°F (-4.9°C) and an average low-temperature of 10.6°F (-11.9°C).

What is the most humid month in Harpers Ferry?

January and February, with an average relative humidity of 88%, are most humid months in Harpers Ferry.

What is the driest month in Harpers Ferry?

The month with the least rainfall in Harpers Ferry, Iowa, is January, when the rain falls for 3.8 days and typically collects 0.75" (19mm) of precipitation.

How much does it rain in Harpers Ferry?

Throughout the year, in Harpers Ferry, Iowa, there are 124.7 rainfall days, and 22.56" (573mm) of precipitation is accumulated.

When does it snow in Harpers Ferry?

Months with snowfall are January through May, October through December.

How much does it snow in Harpers Ferry?

Throughout the year, there are 44.5 snowfall days, and 15.47" (393mm) of snow is accumulated.

What is the month with the least sunshine in Harpers Ferry?

January has the least sunshine of the year in Harpers Ferry, with an average of 3.4h of sunshine.

What are the months with the lowest UV index in Harpers Ferry?

The months with the lowest UV index in Harpers Ferry are January, November and December, with an average maximum UV index of 1.

What is the snowiest month in Harpers Ferry?

The month with the most snowfall in Harpers Ferry, Iowa, is February, when snow falls for 9.8 days and typically aggregates up to 3.94" (100mm) of snow.

When is Daylight Saving Time (DST) in Harpers Ferry?

On Sunday, March 12. 2023, at 2:00 am, Daylight Saving Time starts in Harpers Ferry, Iowa, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 5. 2023, at 2:00 am, and the time zone reverts from CDT to CST.

What is the wettest month in Harpers Ferry?

June is the month with the most rainfall in Harpers Ferry, Iowa. Rain falls for 18.6 days and accumulates 3.9" (99mm) of precipitation.

When it does not snow in Harpers Ferry?

June through September are months without snowfall.

When are the longest days in Harpers Ferry?

June has the longest days of the year, with an average of 15h and 20min of daylight.

What are the months with the highest UV index in Harpers Ferry?

June and July, with an average maximum UV index of 6, are months with the highest UV index in Harpers Ferry.

What is the warmest month in Harpers Ferry?

With an average high-temperature of 79.9°F (26.6°C) and an average low-temperature of 61.9°F (16.6°C), July is the warmest month.

What month has the most sunshine in Harpers Ferry?

The month with the most sunshine is August, with an average of 9.8h of sunshine.

What is the least humid month in Harpers Ferry?

October is the least humid month, with an average relative humidity of 76%.

What is the month with the shortest days in Harpers Ferry?

With an average of 9h and 3min of daylight, December has the shortest days of the year.

Average temperature
Harpers Ferry, IA

Average temperature - Harpers Ferry, IA

The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (23.2°F).

The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is January (10.6°F).

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Average pressure
Harpers Ferry, IA

Average pressure - Harpers Ferry, IA

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

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Average wind speed
Harpers Ferry, IA

Average wind speed - Harpers Ferry, IA

The windiest month (with the highest average wind speed) is April (9.9mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).

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Average humidity
Harpers Ferry, IA

Average humidity - Harpers Ferry, IA

The months with the highest relative humidity are January and February (88%).
The month with the lowest relative humidity is October (76%).

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Average rainfall
Harpers Ferry, IA

Average rainfall - Harpers Ferry, IA

The wettest month (with the highest rainfall) is June (3.9").
The driest month (with the least rainfall) is January (0.75").

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Average rainfall days
Harpers Ferry, IA

Average rainfall days - Harpers Ferry, IA

The month with the highest number of rainy days is June (18.6 days).
The month with the least rainy days is February (3.6 days).

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Average snowfall
Harpers Ferry, IA

Average snowfall - Harpers Ferry, IA

The month with the highest snowfall is February (3.94").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days
Harpers Ferry, IA

Average snowfall days - Harpers Ferry, IA

The month with the highest number of snowfall days is January (11.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
Harpers Ferry, IA

Average daylight / Average sunshine - Harpers Ferry, IA

The month with the longest days is June (Average daylight: 15h and 20min).
The month with the shortest days is December (Average daylight: 9h and 3min).

The month with the most sunshine is August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).

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Average sunshine days
Harpers Ferry, IA

Average sunshine days - Harpers Ferry, IA

The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is June (9.6 days).

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Average UV index
Harpers Ferry, IA

Average UV index - Harpers Ferry, IA

The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, November and December (UV index 1).

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Average visibility
Harpers Ferry, IA

Average visibility - Harpers Ferry, IA

The months with the highest visibility are March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, February, July, August and September (5mi).

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