Climate and monthly weather forecastHarlan, IN
Climate and monthly weather forecast
Weather in January
January, the same as December, in Harlan, Indiana, is a freezing cold winter month, with an average temperature ranging between max 30.6°F (-0.8°C) and min 19°F (-7.2°C). Harlan's coldest month, January, registers temperatures that range from a high of 30.6°F (-0.8°C) to a low of 19°F (-7.2°C). Weather in January »Weather in February
February, the last month of the winter in Harlan, is a cold month, with temperature in the range of an average low of 22.1°F (-5.5°C) and an average high of 34.3°F (1.3°C). Upon the onset of February, Harlan witnesses an average high-temperature of a cold 34.3°F (1.3°C), showing a close resemblance to the prior month. Weather in February »Weather in March
The first month of the spring, March, is a chilly month in Harlan, Indiana, with an average temperature ranging between max 46°F (7.8°C) and min 31.5°F (-0.3°C). March's arrival signals an increase in average high-temperatures, moving from February's cold 34.3°F (1.3°C) to a frosty 46°F (7.8°C). Weather in March »Weather in April
April is a refreshing spring month in Harlan, Indiana, with temperature in the range of an average high of 58.1°F (14.5°C) and an average low of 41.7°F (5.4°C). The beginning of April signals a rise in the average high-temperature, moving from a frosty 46°F (7.8°C) in March to a mild 58.1°F (14.5°C). Weather in April »Weather in May
The last month of the spring, May, is an agreeable month in Harlan, Indiana, with an average temperature ranging between max 70.3°F (21.3°C) and min 53.1°F (11.7°C). An escalation in the average high-temperature is seen with the onset of May, moving from a moderate 58.1°F (14.5°C) in April to an agreeable 70.3°F (21.3°C). Weather in May »Weather in June
The first month of the summer, June, is a moderately hot month in Harlan, Indiana, with an average temperature ranging between min 60.8°F (16°C) and max 78.1°F (25.6°C). In June, the meteorological conditions subtly change with the average high-temperature edging from an agreeable 70.3°F (21.3°C) in May to a moderately hot 78.1°F (25.6°C). Weather in June »Weather in July
July, like June, in Harlan, Indiana, is a moderately hot summer month, with temperature in the range of an average high of 81.1°F (27.3°C) and an average low of 63.9°F (17.7°C). The average temperatures reach their apex in July, averaging 81.1°F (27.3°C) at the high end and 63.9°F (17.7°C) at the low end. For July, the heat index is computed 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 Harlan, Indiana, with an average temperature varying between 79.2°F (26.2°C) and 61.3°F (16.3°C). August's climate shows a minor adjustment in average high-temperatures to a still warm 79.2°F (26.2°C) from July's 81.1°F (27.3°C). Weather in August »Weather in September
September, the first month of the autumn in Harlan, is still a warm month, with temperature in the range of an average low of 55.4°F (13°C) and an average high of 73.8°F (23.2°C). In the transition to September, Harlan observes a minor drop in the average high-temperature, shifting from a warm 79.2°F (26.2°C) in August to a still moderately hot 73.8°F (23.2°C). Weather in September »Weather in October
October, like September, in Harlan, Indiana, is another refreshing autumn month, with an average temperature varying between 45.5°F (7.5°C) and 61.3°F (16.3°C). The arrival of October signals a shift in temperature, down from a moderately hot 73.8°F (23.2°C) in September to a comfortable 61.3°F (16.3°C). Weather in October »Weather in November
The last month of the autumn, November, is also a frosty month in Harlan, Indiana, with temperature in the range of an average low of 34.5°F (1.4°C) and an average high of 47.3°F (8.5°C). November indicates a shift in the average high-temperature, from October's comfortable 61.3°F (16.3°C) to a frosty 47.3°F (8.5°C). Weather in November »Weather in December
The first month of the winter, December, is also an icy month in Harlan, Indiana, with an average temperature varying between 26.8°F (-2.9°C) and 36.1°F (2.3°C). Harlan's transition into December involves a shift in temperature, receding from a chilly 47.3°F (8.5°C) in November to a wintry 36.1°F (2.3°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, noted for its average high-temperature of 30.6°F (-0.8°C) and an average low-temperature of 19°F (-7.2°C), is considered the coldest month in Harlan, Indiana.
January and February, with an average relative humidity of 84%, are most humid months in Harlan.
In Harlan, Indiana, during the entire year, the rain falls for 140.8 days and collects up to 16.22" (412mm) of precipitation.
January through May, October through December are months with snowfall in Harlan, Indiana.
In Harlan, Indiana, during the entire year, snow falls for 45.1 days and aggregates up to 7.8" (198mm) of snow.
With an average of 3.4h of sunshine, January has the least sunshine of the year.
February is the month with the least rainfall in Harlan, Indiana. Rain falls for 6.5 days and accumulates 0.87" (22mm) of precipitation.
The month with the most snowfall in Harlan is February, when snow falls for 11 days and typically aggregates up to 2.2" (56mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Harlan, Indiana, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.
May is the month with the most rainfall. Rain falls for 16.3 days and accumulates 2.09" (53mm) of precipitation.
June through September are months without snowfall in Harlan.
With an average of 15h and 6min of daylight, June has the longest days of the year.
The month with the highest UV index in Harlan is June, with an average maximum UV index of 6.
July is the month when Harlan's temperatures reach their peak, with averages of 81.1°F (27.3°C) and lows of 63.9°F (17.7°C).
The month with the most sunshine is July, with an average of 10.3h of sunshine.
October is the least humid month in Harlan, Indiana, with an average relative humidity of 75%.
The month with the shortest days in Harlan is December, with an average of 9h and 18min of daylight.
With an average maximum UV index of 1, December is the month with the lowest UV index in Harlan.
Average temperature
Harlan, IN
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (30.6°F).
The month with the highest average low temperature is July (63.9°F).
The coldest month (with the lowest average low temperature) is January (19°F).
Average pressure
Harlan, IN
- Average pressure in January:
30.11"Hg - Average pressure in February:
30.09"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
29.96"Hg - Average pressure in May:
29.97"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.04"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.11"Hg - Average pressure in December:
30.1"Hg
The months with the highest atmospheric pressure are January and November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed
Harlan, IN
- Average wind speed in January:
10.4mph - Average wind speed in February:
10.1mph - Average wind speed in March:
9.6mph - Average wind speed in April:
10mph - Average wind speed in May:
8.4mph - Average wind speed in June:
7.4mph
- Average wind speed in July:
6.2mph - Average wind speed in August:
6.1mph - Average wind speed in September:
6.8mph - Average wind speed in October:
8.8mph - Average wind speed in November:
9.4mph - Average wind speed in December:
9.6mph
The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).
Average humidity
Harlan, IN
The months with the highest relative humidity are January and February (84%).
The month with the lowest relative humidity is October (75%).
Average rainfall
Harlan, IN
- Average rainfall in January:
0.94" - Average rainfall in February:
0.87" - Average rainfall in March:
1.26" - Average rainfall in April:
1.93" - Average rainfall in May:
2.09" - Average rainfall in June:
1.77"
- Average rainfall in July:
1.61" - Average rainfall in August:
1.42" - Average rainfall in September:
1.18" - Average rainfall in October:
1.14" - Average rainfall in November:
1.06" - Average rainfall in December:
0.94"
The wettest month (with the highest rainfall) is May (2.09").
The driest month (with the least rainfall) is February (0.87").
Average rainfall days
Harlan, IN
- Average rainfall days in January:
7.4 days - Average rainfall days in February:
6.5 days - Average rainfall days in March:
10.9 days - Average rainfall days in April:
14 days - Average rainfall days in May:
16.3 days - Average rainfall days in June:
15.3 days
- Average rainfall days in July:
15.1 days - Average rainfall days in August:
13.8 days - Average rainfall days in September:
11.5 days - Average rainfall days in October:
11.8 days - Average rainfall days in November:
9 days - Average rainfall days in December:
9.2 days
The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is February (6.5 days).
Average snowfall
Harlan, IN
- Average snowfall in January:
1.61" - Average snowfall in February:
2.2" - Average snowfall in March:
0.75" - Average snowfall in April:
0.59" - Average snowfall in May:
0.04" - Average snowfall in June:
0"
The month with the highest snowfall is February (2.2").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Harlan, IN
- Average snowfall days in January:
12.2 days - Average snowfall days in February:
11 days - Average snowfall days in March:
6 days - Average snowfall days in April:
1.6 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:
4.2 days - Average snowfall days in December:
9.5 days
The month with the highest number of snowfall days is January (12.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Harlan, IN
- Average daylight in January:
9h and 36min - Average daylight in February:
10h and 42min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 18min - Average daylight in May:
14h and 30min - Average daylight in June:
15h and 6min
- 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 54min - Average daylight in December:
9h and 18min
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 18min).
- Average sunshine in January:
3h and 24min - Average sunshine in February:
4h and 18min - Average sunshine in March:
5h and 54min - Average sunshine in April:
7h and 0min - Average sunshine in May:
8h and 36min - Average sunshine in June:
10h and 0min
- Average sunshine in July:
10h and 18min - Average sunshine in August:
9h and 36min - Average sunshine in September:
8h and 0min - Average sunshine in October:
6h and 12min - Average sunshine in November:
5h and 6min - Average sunshine in December:
3h and 48min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days
Harlan, IN
- Average sunshine days in January:
14 days - Average sunshine days in February:
13 days - Average sunshine days in March:
16 days - Average sunshine days in April:
12.8 days - Average sunshine days in May:
12.3 days - Average sunshine days in June:
11.5 days
- Average sunshine days in July:
12.3 days - Average sunshine days in August:
13 days - Average sunshine days in September:
15.1 days - Average sunshine days in October:
16.8 days - Average sunshine days in November:
17.6 days - Average sunshine days in December:
15.6 days
The month with the most sunshine days is November (17.6 days).
The month with the least sunshine days is June (11.5 days).
Average UV index
Harlan, IN
The month with the highest UV index is June (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover
Harlan, IN
The month with the most cloud cover is January (Cloud cover 65).
The months with the least cloud cover are July and August (Cloud cover 32).
Average visibility
Harlan, IN
The months with the highest visibility are January, February, March, April, May, June, July, September, October, November and December (6mi).
The month with the lowest visibility is August (5mi).
