Climate and monthly weather forecastHarlan, IA
Climate and monthly weather forecast
Weather in January
January, the same as December, in Harlan, Iowa, is a freezing cold winter month, with an average temperature varying between 27.3°F (-2.6°C) and 14.5°F (-9.7°C). January is the coldest month of the year, registering average temperatures as high as 27.3°F (-2.6°C) and as low as 14.5°F (-9.7°C). Weather in January »Weather in February
The last month of the winter, February, is another freezing cold month in Harlan, Iowa, with an average temperature ranging between min 18°F (-7.8°C) and max 31.5°F (-0.3°C). The average high-temperature for February is a still freezing cold 31.5°F (-0.3°C), closely aligning with the temperature of the preceding month. Weather in February »Weather in March
The first month of the spring, March, is a frosty month in Harlan, Iowa, with an average temperature fluctuating between 46.9°F (8.3°C) and 31.8°F (-0.1°C). As March begins, there is a noticeable increase in the average high-temperature, soaring from a freezing cold 31.5°F (-0.3°C) in February to a chilly 46.9°F (8.3°C). Weather in March »Weather in April
April is a refreshing spring month in Harlan, Iowa, with an average temperature varying between 42.3°F (5.7°C) and 58.8°F (14.9°C). The onset of April brings a temperature shift, with the average high-temperature moving from a chilly 46.9°F (8.3°C) in March to a refreshing 58.8°F (14.9°C). Weather in April »Weather in May
The last month of the spring, May, is an agreeable month in Harlan, Iowa, with an average temperature fluctuating between 52.9°F (11.6°C) and 69.4°F (20.8°C). A shift in the average high-temperature is noticeable in May, changing from a moderate 58.8°F (14.9°C) in April to an agreeable 69.4°F (20.8°C). Weather in May »Weather in June
The first month of the summer, June, is a warm month in Harlan, Iowa, with an average temperature fluctuating between 63°F (17.2°C) and 79.3°F (26.3°C). The commencement of June sees a shift in the average high-temperature, moving from an agreeable 69.4°F (20.8°C) in May to a moderately hot 79.3°F (26.3°C). Weather in June »Weather in July
July, like June, in Harlan, Iowa, is a moderately hot summer month, with temperature in the range of an average low of 64.9°F (18.3°C) and an average high of 82.6°F (28.1°C). July is the warmest month, with the temperature often reaching an average high of 82.6°F (28.1°C) and an average low of 64.9°F (18.3°C). The heat index value for July is evaluated at a hot 89.6°F (32°C). Weather in July »Weather in August
August, the last month of the summer in Harlan, is another warm month, with an average temperature varying between 62.1°F (16.7°C) and 80.2°F (26.8°C). The unfolding of August shows an average high-temperature of a still warm 80.2°F (26.8°C), indicating a slight variance from July's 82.6°F (28.1°C). Weather in August »Weather in September
The first month of the autumn, September, is also a moderately hot month in Harlan, Iowa, with an average temperature varying between 75°F (23.9°C) and 55.9°F (13.3°C). Welcoming September, Harlan notes an average high-temperature of a still warm 75°F (23.9°C), nearly consistent with August's 80.2°F (26.8°C). Weather in September »Weather in October
October, like September, is another mild autumn month in Harlan, Iowa, with temperature in the range of an average high of 59.7°F (15.4°C) and an average low of 44.1°F (6.7°C). In October, the average high-temperature decreases considerably from a warm 75°F (23.9°C) in September to a mild 59.7°F (15.4°C). Weather in October »Weather in November
November, the last month of the autumn in Harlan, is another chilly month, with an average temperature ranging between min 32.2°F (0.1°C) and max 46.2°F (7.9°C). The average high-temperature drops in November, from October's moderate 59.7°F (15.4°C) to a frosty 46.2°F (7.9°C). Weather in November »Weather in December
December, the first month of the winter in Harlan, is also an icy month, with an average temperature fluctuating between 20.8°F (-6.2°C) and 32.2°F (0.1°C). Harlan, Iowa, experiences a temperature shift at the start of December, with average high-temperatures adjusting from a frosty 46.2°F (7.9°C) in November to an icy 32.2°F (0.1°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
January, with an average high of 27.3°F (-2.6°C) and a low of 14.5°F (-9.7°C), signifies the coldest month of the year in Harlan.
With an average relative humidity of 83%, January is the most humid month.
The month with the least rainfall in Harlan is January, when the rain falls for 3.2 days and typically collects 0.43" (11mm) of precipitation.
Throughout the year, in Harlan, Iowa, there are 113.5 rainfall days, and 15.71" (399mm) of precipitation is accumulated.
Months with snowfall in Harlan are January through May, October through December.
Throughout the year, in Harlan, there are 31.5 snowfall days, and 7.13" (181mm) of snow is accumulated.
The month with the least sunshine is January, with an average of 4.5h of sunshine.
The months with the lowest UV index are January, February, October through December, with an average maximum UV index of 2.
The month with the most snowfall is February, when snow falls for 7.3 days and typically aggregates up to 2.09" (53mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Harlan, 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.
The month with the most rainfall in Harlan is June, when the rain falls for 16.1 days and typically aggregates up to 2.64" (67mm) of precipitation.
June through September are months without snowfall in Harlan, Iowa.
With an average of 15h and 12min of daylight, June has the longest days of the year in Harlan.
June through August, with an average maximum UV index of 6, are months with the highest UV index in Harlan.
July, recognised by an average high temperature of 82.6°F (28.1°C) and a low of 64.9°F (18.3°C), is Harlan's warmest month.
The month with the most sunshine is July, with an average of 10.4h of sunshine.
October is the least humid month, with an average relative humidity of 68%.
The month with the shortest days in Harlan, Iowa, is December, with an average of 9h and 12min of daylight.
Average temperature
Harlan, IA
The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is January (27.3°F).
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (14.5°F).
Average pressure
Harlan, IA
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.14"Hg - Average pressure in March:
30.06"Hg - Average pressure in April:
29.92"Hg - Average pressure in May:
29.92"Hg - Average pressure in June:
29.87"Hg
- Average pressure in July:
29.95"Hg - Average pressure in August:
29.96"Hg - Average pressure in September:
30"Hg - Average pressure in October:
30"Hg - Average pressure in November:
30.08"Hg - Average pressure in December:
30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed
Harlan, IA
- Average wind speed in January:
10.6mph - Average wind speed in February:
10.6mph - Average wind speed in March:
10.7mph - Average wind speed in April:
10.9mph - Average wind speed in May:
9.3mph - Average wind speed in June:
8.5mph
- Average wind speed in July:
7.2mph - Average wind speed in August:
7.4mph - Average wind speed in September:
8.5mph - Average wind speed in October:
9.7mph - Average wind speed in November:
10.4mph - Average wind speed in December:
10.1mph
The windiest month (with the highest average wind speed) is April (10.9mph).
The calmest month (with the lowest average wind speed) is July (7.2mph).
Average humidity
Harlan, IA
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is October (68%).
Average rainfall
Harlan, IA
- Average rainfall in January:
0.43" - Average rainfall in February:
0.47" - Average rainfall in March:
0.91" - Average rainfall in April:
1.26" - Average rainfall in May:
2.6" - Average rainfall in June:
2.64"
- Average rainfall in July:
1.5" - Average rainfall in August:
1.93" - Average rainfall in September:
1.65" - Average rainfall in October:
1.06" - Average rainfall in November:
0.55" - Average rainfall in December:
0.71"
The wettest month (with the highest rainfall) is June (2.64").
The driest month (with the least rainfall) is January (0.43").
Average rainfall days
Harlan, IA
- Average rainfall days in January:
3.2 days - Average rainfall days in February:
2.8 days - Average rainfall days in March:
8.8 days - Average rainfall days in April:
12.8 days - Average rainfall days in May:
15.7 days - Average rainfall days in June:
16.1 days
- Average rainfall days in July:
13.1 days - Average rainfall days in August:
12.3 days - Average rainfall days in September:
10.5 days - Average rainfall days in October:
8.5 days - Average rainfall days in November:
5.5 days - Average rainfall days in December:
4.2 days
The month with the highest number of rainy days is June (16.1 days).
The month with the least rainy days is February (2.8 days).
Average snowfall
Harlan, IA
- Average snowfall in January:
1.57" - Average snowfall in February:
2.09" - Average snowfall in March:
1.22" - Average snowfall in April:
0.28" - Average snowfall in May:
0.16" - Average snowfall in June:
0"
The month with the highest snowfall is February (2.09").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Harlan, IA
- Average snowfall days in January:
8.3 days - Average snowfall days in February:
7.3 days - Average snowfall days in March:
4.8 days - Average snowfall days in April:
1 days - Average snowfall days in May:
0.3 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:
0.7 days - Average snowfall days in November:
3 days - Average snowfall days in December:
6.1 days
The month with the highest number of snowfall days is January (8.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Harlan, 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 30min - Average sunshine in February:
5h and 12min - Average sunshine in March:
6h and 18min - Average sunshine in April:
8h and 12min - Average sunshine in May:
8h and 48min - Average sunshine in June:
9h and 54min
- Average sunshine in July:
10h and 24min - Average sunshine in August:
9h and 48min - Average sunshine in September:
9h and 6min - Average sunshine in October:
5h and 54min - Average sunshine in November:
5h and 48min - Average sunshine in December:
4h and 48min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days
Harlan, IA
- Average sunshine days in January:
20.1 days - Average sunshine days in February:
17.8 days - Average sunshine days in March:
17.9 days - Average sunshine days in April:
15 days - Average sunshine days in May:
12.8 days - Average sunshine days in June:
11.4 days
- Average sunshine days in July:
12.7 days - Average sunshine days in August:
15.5 days - Average sunshine days in September:
16.5 days - Average sunshine days in October:
20.5 days - Average sunshine days in November:
21.3 days - Average sunshine days in December:
21.6 days
The month with the most sunshine days is December (21.6 days).
The month with the least sunshine days is June (11.4 days).
Average UV index
Harlan, IA
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover
Harlan, IA
The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 27).
Average visibility
Harlan, IA
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
