Expand
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 Harper, Iowa, with an average temperature ranging between min 15.6°F (-9.1°C) and max 28.6°F (-1.9°C). January is the coldest month, with the temperature often reaching an average high of 28.6°F (-1.9°C) and an average low of 15.6°F (-9.1°C). Weather in January »
Weather in February
February, the last month of the winter in Harper, is an icy month, with temperature in the range of an average high of 32.5°F (0.3°C) and an average low of 19°F (-7.2°C). With the advent of February, Harper experiences an average high-temperature of a cold 32.5°F (0.3°C), mirroring a close resemblance to the previous month. Weather in February »
Weather in March
March, the first month of the spring in Harper, is a chilly month, with an average temperature ranging between min 32.4°F (0.2°C) and max 47.1°F (8.4°C). Witnessing a clear upsurge, the average high-temperature during March escalates from February's cold 32.5°F (0.3°C) to a frosty 47.1°F (8.4°C). Weather in March »
Weather in April
April is a moderate spring month in Harper, Iowa, with an average temperature ranging between max 59.5°F (15.3°C) and min 42.4°F (5.8°C). The shift into April is marked by a rise in the average high-temperature, moving from March's chilly 47.1°F (8.4°C) to a refreshing 59.5°F (15.3°C). Weather in April »
Weather in May
May, the last month of the spring in Harper, is an agreeable month, with an average temperature fluctuating between 70°F (21.1°C) and 53.2°F (11.8°C). The average high-temperature increases in May, moving from a moderate 59.5°F (15.3°C) in April to an agreeable 70°F (21.1°C). Weather in May »
Weather in June
June, the first month of the summer in Harper, is a moderately hot month, with an average temperature varying between 63.1°F (17.3°C) and 79.3°F (26.3°C). The onset of June brings a rise in the average high-temperature, elevating from an agreeable 70°F (21.1°C) in May to a warm 79.3°F (26.3°C). Weather in June »
Weather in July
July, like June, in Harper, Iowa, is a moderately hot summer month, with temperature in the range of an average high of 82°F (27.8°C) and an average low of 65.1°F (18.4°C). In Harper, the peak average temperatures are observed in July, with a high of 82°F (27.8°C) and a low of 65.1°F (18.4°C). July's heat index is evaluated at a hot 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 Harper, Iowa, with an average temperature ranging between max 81.1°F (27.3°C) and min 62.8°F (17.1°C). During August, the average high-temperature is a still warm 81.1°F (27.3°C), maintaining a close resemblance to that of the preceding month. Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Harper, Iowa, with an average temperature varying between 75.2°F (24°C) and 56.3°F (13.5°C). September is marked by a subtle drop in average high-temperatures, transitioning from 81.1°F (27.3°C) in August to a still warm 75.2°F (24°C). Weather in September »
Weather in October
October, the same as September, is another comfortable autumn month in Harper, Iowa, with an average temperature fluctuating between 61.3°F (16.3°C) and 44.8°F (7.1°C). October brings a decrease in the average high-temperature, falling from September's moderately hot 75.2°F (24°C) to a comfortable 61.3°F (16.3°C). Weather in October »
Weather in November
November, the last month of the autumn in Harper, is also a frosty month, with temperature in the range of an average low of 33.4°F (0.8°C) and an average high of 46.9°F (8.3°C). A distinct shift in the average high-temperature is signaled in November, moving down from a comfortable 61.3°F (16.3°C) in October to a frosty 46.9°F (8.3°C). Weather in November »
Weather in December
December, the first month of the winter in Harper, is also a wintry month, with temperature in the range of an average high of 34.7°F (1.5°C) and an average low of 23.4°F (-4.8°C). A shift in the average high-temperature occurs in December, reducing from a frosty 46.9°F (8.3°C) in November to a wintry 34.7°F (1.5°C). Weather in December »
Updated: Jun 5, 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 part of the year is the coldest?
In Harper, January is known for its average lowest temperatures, reaching a high of 28.6°F (-1.9°C) and a low of 15.6°F (-9.1°C).
How many days does it rain?
Throughout the year, there are 137.9 rainfall days, and 27.76" (705mm) of precipitation is accumulated.
When does it snow in Harper?
January through May, October through December are months with snowfall.
When does it snow the most?
January is the month with the most snowfall. Snow falls for 9.5 days and accumulates 4.06" (103mm) of snow.
How many days does it snow in Harper?
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?
January has the least sunshine of the year, with an average of 4.2h of sunshine.
When is the lowest UV index?
The months with the lowest UV index in Harper are January, February, October through December, with an average maximum UV index of 2.
What is the driest month?
February is the month with the least rainfall in Harper. Rain falls for 4.9 days and accumulates 0.98" (25mm) of precipitation.
When is Daylight Saving Time (DST)?
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?
May is the month with the most rainfall. Rain falls for 17.7 days and accumulates 4.17" (106mm) of precipitation.
When it does not snow?
In Harper, snow does not fall in June through September.
When are the longest days?
June has the longest days of the year, with an average of 15h and 6min of daylight.
When is the highest UV index?
The months with the highest UV index are June and July, with an average maximum UV index of 6.
What is the hottest time of year?
July registers as the month with the average highest temperatures, reaching 82°F (27.8°C) at its peak and 65.1°F (18.4°C) at the lowest.
What is the most humid month?
The most humid month is July, with an average relative humidity of 83%.
What month has the most sunshine in Harper?
July has the most sunshine of the year, with an average of 10.3h of sunshine.
What is the least humid month?
October is the least humid month, with an average relative humidity of 72%.
What is the month with the shortest days?
With an average of 9h and 12min of daylight, December has the shortest days of the year.
Average temperature
Harper, 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
Harper, 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
Harper, 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
Harper, IA
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Harper, 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
Harper, 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
Harper, 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
Harper, 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
Harper, 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 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
Harper, 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
Harper, 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
Harper, 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
Harper, 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).
Harper, Iowa, USA
Weather forecast for your location
1. Click Locate me button
2. Allow the app to use your location
2. Allow the app to use your location