Climate and monthly weather forecastHerndon, KY
Climate and monthly weather forecast
Weather in January
January, the same as December, is a wintry winter month in Herndon, Kentucky, with an average temperature fluctuating between 28.9°F (-1.7°C) and 42.6°F (5.9°C). January, with its high-temperature average of 42.6°F (5.9°C) and a low-temperature average of 28.9°F (-1.7°C), is the coldest month. Weather in January »Weather in February
February, the last month of the winter in Herndon, is a chilly month, with an average temperature fluctuating between 47.5°F (8.6°C) and 32.7°F (0.4°C). The introduction of February sees an average high-temperature of a chilly 47.5°F (8.6°C), hardly deviating from January. Weather in February »Weather in March
March, the first month of the spring in Herndon, is a refreshing month, with an average temperature ranging between max 57.4°F (14.1°C) and min 40.6°F (4.8°C). March's onset brings a temperature rise, moving from a frosty 47.5°F (8.6°C) in February to a mild 57.4°F (14.1°C). Weather in March »Weather in April
April in Herndon, Kentucky, is an enjoyable spring month, with an average temperature varying between 67.8°F (19.9°C) and 49.6°F (9.8°C). Herndon in April sees a temperature change, with average high-temperatures moving from a mild 57.4°F (14.1°C) in March to an enjoyable 67.8°F (19.9°C). Weather in April »Weather in May
May, the last month of the spring in Herndon, is a warm month, with an average temperature varying between 58.8°F (14.9°C) and 76.6°F (24.8°C). May comes with a subtle rise, with the average high-temperature adjusting from a comfortable 67.8°F (19.9°C) in April to a warm 76.6°F (24.8°C). Weather in May »Weather in June
June, the first month of the summer in Herndon, is still a warm month, with an average temperature varying between 85.5°F (29.7°C) and 65.8°F (18.8°C). June witnesses a subtle temperature ascent, adjusting from 76.6°F (24.8°C) in May to a still warm 85.5°F (29.7°C). Weather in June »Weather in July
July is a tropical summer month in Herndon, Kentucky, with an average temperature ranging between min 68.5°F (20.3°C) and max 87.4°F (30.8°C). The warmest time of the year is July, with temperatures averaging a high of 87.4°F (30.8°C) and a low of 68.5°F (20.3°C). In July, the heat index is calculated to be an extremely hot 104°F (40°C). Weather in July »Weather in August
The last month of the summer, August, is another hot month in Herndon, Kentucky, with an average temperature ranging between min 67.3°F (19.6°C) and max 86.4°F (30.2°C). Entering August, Herndon's average high-temperature reads a still tropical 86.4°F (30.2°C), indicating a close resemblance to the previous month's climate. Weather in August »Weather in September
The first month of the autumn, September, is still a warm month in Herndon, Kentucky, with an average temperature fluctuating between 61.5°F (16.4°C) and 80.8°F (27.1°C). September signifies a minor drop in average high-temperature, transitioning from a tropical 86.4°F (30.2°C) in August to a warm 80.8°F (27.1°C). Weather in September »Weather in October
October, like September, is another pleasant autumn month in Herndon, Kentucky, with an average temperature fluctuating between 69.1°F (20.6°C) and 50.4°F (10.2°C). With the onset of October, Herndon's average high-temperature adjusts, receding from September's moderately hot 80.8°F (27.1°C) to an agreeable 69.1°F (20.6°C). Weather in October »Weather in November
November, the last month of the autumn in Herndon, is another mild month, with an average temperature varying between 39.9°F (4.4°C) and 56.1°F (13.4°C). November's arrival corresponds with a decrease in average high-temperatures, from October's agreeable 69.1°F (20.6°C) to a refreshing 56.1°F (13.4°C). Weather in November »Weather in December
The first month of the winter, December, is still a chilly month in Herndon, Kentucky, with an average temperature varying between 34.7°F (1.5°C) and 47.3°F (8.5°C). The transition into December subtly indicates a reduction in the average high-temperature, down to a frosty 47.3°F (8.5°C) from November's moderate 56.1°F (13.4°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
Herndon reaches its average lowest temperatures in January, measuring 42.6°F (5.9°C) at the peak and 28.9°F (-1.7°C) at the lowest.
Throughout the year, in Herndon, there are 179.3 rainfall days, and 39.76" (1010mm) of precipitation is accumulated.
Months with snowfall are January through April, October through December.
The month with the most snowfall in Herndon is January, when snow falls for 4.9 days and typically aggregates up to 1.42" (36mm) of snow.
In Herndon, during the entire year, snow falls for 15.8 days and aggregates up to 5.35" (136mm) of snow.
January, February and December, with an average maximum UV index of 2, are months with the lowest UV index in Herndon.
The month with the most rainfall in Herndon is February, when the rain falls for 12.8 days and typically aggregates up to 4.06" (103mm) of precipitation.
The month with the least sunshine in Herndon is February, with an average of 4.5h of sunshine.
March and May, with an average relative humidity of 79%, are most humid months.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Herndon, Kentucky, 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.
May through September are months without snowfall in Herndon.
May through August, with an average maximum UV index of 6, are months with the highest UV index.
With an average of 14h and 36min of daylight, June has the longest days of the year.
With an average of 10.5h of sunshine, June has the most sunshine of the year.
With an average high-temperature of 87.4°F (30.8°C) and an average low-temperature of 68.5°F (20.3°C), July is the warmest month in Herndon, Kentucky.
September is the month with the least rainfall in Herndon. Rain falls for 14.8 days and accumulates 2.17" (55mm) of precipitation.
October is the least humid month in Herndon, with an average relative humidity of 72%.
The month with the shortest days in Herndon is December, with an average of 9h and 42min of daylight.
Average temperature
Herndon, KY
The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (42.6°F).
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (28.9°F).
Average pressure
Herndon, KY
- Average pressure in January:
30.17"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
29.98"Hg - Average pressure in May:
29.99"Hg - Average pressure in June:
29.96"Hg
- Average pressure in July:
29.99"Hg - Average pressure in August:
29.99"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.06"Hg - Average pressure in November:
30.15"Hg - Average pressure in December:
30.14"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed
Herndon, KY
- Average wind speed in January:
8.7mph - Average wind speed in February:
8.8mph - Average wind speed in March:
8.7mph - Average wind speed in April:
8.8mph - Average wind speed in May:
7mph - Average wind speed in June:
5.8mph
- Average wind speed in July:
5.2mph - Average wind speed in August:
5.3mph - Average wind speed in September:
5.8mph - Average wind speed in October:
7.3mph - Average wind speed in November:
7.9mph - Average wind speed in December:
8.2mph
The windiest months (with the highest average wind speed) are February and April (8.8mph).
The calmest month (with the lowest average wind speed) is July (5.2mph).
Average humidity
Herndon, KY
The months with the highest relative humidity are March and May (79%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Herndon, KY
- Average rainfall in January:
2.48" - Average rainfall in February:
4.06" - Average rainfall in March:
3.23" - Average rainfall in April:
3.74" - Average rainfall in May:
3.98" - Average rainfall in June:
3.58"
- Average rainfall in July:
3.86" - Average rainfall in August:
3.58" - Average rainfall in September:
2.17" - Average rainfall in October:
2.76" - Average rainfall in November:
2.83" - Average rainfall in December:
3.5"
The wettest month (with the highest rainfall) is February (4.06").
The driest month (with the least rainfall) is September (2.17").
Average rainfall days
Herndon, KY
- Average rainfall days in January:
12 days - Average rainfall days in February:
12.8 days - Average rainfall days in March:
15.8 days - Average rainfall days in April:
15.9 days - Average rainfall days in May:
18.7 days - Average rainfall days in June:
17.4 days
- Average rainfall days in July:
19.6 days - Average rainfall days in August:
17.2 days - Average rainfall days in September:
14.8 days - Average rainfall days in October:
11.9 days - Average rainfall days in November:
10.8 days - Average rainfall days in December:
12.4 days
The month with the highest number of rainy days is July (19.6 days).
The month with the least rainy days is November (10.8 days).
Average snowfall
Herndon, KY
The month with the highest snowfall is January (1.42").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Herndon, KY
- Average snowfall days in January:
4.9 days - Average snowfall days in February:
3.8 days - Average snowfall days in March:
2.2 days - Average snowfall days in April:
0.3 days - Average snowfall days in May:
0 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:
0.3 days - Average snowfall days in November:
1.2 days - Average snowfall days in December:
3.1 days
The month with the highest number of snowfall days is January (4.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Herndon, KY
- Average daylight in January:
10h and 0min - Average daylight in February:
10h and 54min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 12min - Average daylight in May:
14h and 6min - Average daylight in June:
14h and 36min
- Average daylight in July:
14h and 24min - Average daylight in August:
13h and 30min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 12min - Average daylight in November:
10h and 12min - Average daylight in December:
9h and 42min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in January:
4h and 36min - Average sunshine in February:
4h and 30min - Average sunshine in March:
5h and 54min - Average sunshine in April:
8h and 42min - Average sunshine in May:
9h and 24min - Average sunshine in June:
10h and 30min
- Average sunshine in July:
10h and 18min - Average sunshine in August:
10h and 6min - Average sunshine in September:
8h and 48min - Average sunshine in October:
6h and 48min - Average sunshine in November:
5h and 42min - Average sunshine in December:
4h and 42min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days
Herndon, KY
- Average sunshine days in January:
14.8 days - Average sunshine days in February:
12.6 days - Average sunshine days in March:
12.6 days - Average sunshine days in April:
12.2 days - Average sunshine days in May:
10.3 days - Average sunshine days in June:
9.7 days
- Average sunshine days in July:
8.6 days - Average sunshine days in August:
11.1 days - Average sunshine days in September:
13.3 days - Average sunshine days in October:
17.8 days - Average sunshine days in November:
17.8 days - Average sunshine days in December:
15.5 days
The months with the most sunshine days are October and November (17.8 days).
The month with the least sunshine days is July (8.6 days).
Average UV index
Herndon, KY
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover
Herndon, KY
The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is June (Cloud cover 29).
Average visibility
Herndon, KY
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).
