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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, the same as December, is an icy winter month in Keystone, West Virginia, with an average temperature varying between 39.2°F (4°C) and 25°F (-3.9°C). January, having an average high-temperature of 39.2°F (4°C) and an average low-temperature of 25°F (-3.9°C), is the coldest month. Weather in January »
Weather in February
The last month of the winter, February, is a frosty month in Keystone, West Virginia, with an average temperature varying between 28.2°F (-2.1°C) and 43.9°F (6.6°C). Keystone records an average high-temperature of a chilly 43.9°F (6.6°C) in February, maintaining a close correlation with January's 39.2°F (4°C). Weather in February »
Weather in March
The first month of the spring, March, is a cool month in Keystone, West Virginia, with an average temperature varying between 35.1°F (1.7°C) and 51.8°F (11°C). A soft shift in the average high-temperature is noticeable in March, transitioning from a chilly 43.9°F (6.6°C) in February to a cool 51.8°F (11°C). Weather in March »
Weather in April
April in Keystone, West Virginia, is a refreshing spring month, with an average temperature fluctuating between 63.7°F (17.6°C) and 43.9°F (6.6°C). April brings a rise in Keystone's average high-temperature, moving from a fresh 51.8°F (11°C) in March to an enjoyable 63.7°F (17.6°C). Weather in April »
Weather in May
The last month of the spring, May, is an agreeable month in Keystone, West Virginia, with an average temperature fluctuating between 72.9°F (22.7°C) and 52.2°F (11.2°C). The transition to May introduces an increase in the average high-temperature, shifting from a refreshing 63.7°F (17.6°C) in April to an agreeable 72.9°F (22.7°C). Weather in May »
Weather in June
June, the first month of the summer in Keystone, is a warm month, with an average temperature ranging between min 57°F (13.9°C) and max 80.2°F (26.8°C). As May transitions into June, a subtle temperature shift is observed, with average highs adjusting from an agreeable 72.9°F (22.7°C) to a moderately hot 80.2°F (26.8°C). Weather in June »
Weather in July
July, like June, in Keystone, West Virginia, is another warm summer month, with temperature in the range of an average high of 83.5°F (28.6°C) and an average low of 60.3°F (15.7°C). In Keystone, the highest average temperatures are observed in July, with a high of 83.5°F (28.6°C) and a low of 60.3°F (15.7°C). During July, the heat index is estimated at a hot 91.4°F (33°C). Weather in July »
Weather in August
August, the last month of the summer in Keystone, is also a moderately hot month, with an average temperature fluctuating between 58.5°F (14.7°C) and 82°F (27.8°C). As Keystone welcomes August, the average high-temperature stabilizes at a still warm 82°F (27.8°C), showing little deviation from July's 83.5°F (28.6°C). Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Keystone, West Virginia, with an average temperature ranging between min 54.1°F (12.3°C) and max 76.3°F (24.6°C). The start of September involves a subtle temperature drop, shifting from a moderately hot 82°F (27.8°C) in August to a still warm 76.3°F (24.6°C). Weather in September »
Weather in October
October, like September, in Keystone, West Virginia, is another enjoyable autumn month, with an average temperature fluctuating between 45.1°F (7.3°C) and 64.2°F (17.9°C). The beginning of October marks a decrease in the average high-temperature, transitioning from a moderately hot 76.3°F (24.6°C) in September to a comfortable 64.2°F (17.9°C). Weather in October »
Weather in November
November, the last month of the autumn in Keystone, is another cool month, with an average temperature fluctuating between 52.5°F (11.4°C) and 34.9°F (1.6°C). The onset of November introduces a moderate change in Keystone's weather, with average high-temperatures falling from October's comfortable 64.2°F (17.9°C) to a cool 52.5°F (11.4°C). Weather in November »
Weather in December
December, the first month of the winter in Keystone, is also a frosty month, with an average temperature ranging between max 44.4°F (6.9°C) and min 31.1°F (-0.5°C). The beginning of December subtly marks a decrease in the average high-temperature, transitioning from a fresh 52.5°F (11.4°C) in November to a chilly 44.4°F (6.9°C). Weather in December »
Updated: Jul 22, 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 is the coldest time of year?
Keystone reaches its average lowest temperatures in January, measuring 39.2°F (4°C) at the peak and 25°F (-3.9°C) at the lowest.
How much does it rain?
In Keystone, during the entire year, the rain falls for 172.5 days and collects up to 29.41" (747mm) of precipitation.
When does it snow?
Months with snowfall are January through May, October through December.
How many days does it snow?
In Keystone, during the entire year, snow falls for 38.6 days and aggregates up to 20" (508mm) of snow.
What is the month with the least sunshine?
The month with the least sunshine is January, with an average of 4.2h of sunshine.
What are the months with the lowest UV index?
January, February and December, with an average maximum UV index of 2, are months with the lowest UV index.
What is the most humid month?
With an average relative humidity of 82%, February is the most humid month in Keystone.
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 EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.
What is the rainiest month?
The month with the most rainfall is May, when the rain falls for 19.7 days and typically aggregates up to 3.19" (81mm) of precipitation.
When it does not snow?
June through September are months without snowfall.
When are the longest days?
June has the longest days of the year, with an average of 14h and 42min of daylight.
What is the month with the highest UV index?
June and August, with an average maximum UV index of 6, are months with the highest UV index.
What time of the year is the hottest?
Keystone registers the average highest temperatures during July, with peaks of 83.5°F (28.6°C) and lows of 60.3°F (15.7°C).
What are the least humid months?
July, August and November, with an average relative humidity of 76%, are the least humid months.
What month has the most sunshine?
The month with the most sunshine is August, with an average of 10.1h of sunshine.
What is the driest month?
September is the month with the least rainfall. Rain falls for 15.2 days and accumulates 1.54" (39mm) of precipitation.
What is the snowiest month?
The month with the most snowfall in Keystone, West Virginia, is December, when snow falls for 7.8 days and typically aggregates up to 4.41" (112mm) of snow.
What is the month with the shortest days?
December has the shortest days of the year, with an average of 9h and 36min of daylight.
Average temperature
Keystone, WV
The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is January (39.2°F).
The month with the highest average low temperature is July (60.3°F).
The coldest month (with the lowest average low temperature) is January (25°F).
Average pressure
Keystone, WV
- Average pressure in January:
30.15"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.1"Hg - Average pressure in April:
30"Hg - Average pressure in May:
30.03"Hg - Average pressure in June:
29.99"Hg
- Average pressure in July:
30.02"Hg - Average pressure in August:
30.03"Hg - Average pressure in September:
30.06"Hg - Average pressure in October:
30.07"Hg - Average pressure in November:
30.16"Hg - Average pressure in December:
30.14"Hg
The month with the highest atmospheric pressure is November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.99"Hg).
Average wind speed
Keystone, WV
- Average wind speed in January:
7.3mph - Average wind speed in February:
7.1mph - Average wind speed in March:
6.8mph - Average wind speed in April:
7.1mph - Average wind speed in May:
5.9mph - Average wind speed in June:
5.2mph
- Average wind speed in July:
4.6mph - Average wind speed in August:
4.2mph - Average wind speed in September:
4.5mph - Average wind speed in October:
5.4mph - Average wind speed in November:
5.8mph - Average wind speed in December:
6.5mph
The windiest month (with the highest average wind speed) is January (7.3mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).
Average humidity
Keystone, WV
The month with the highest relative humidity is February (82%).
The months with the lowest relative humidity are July, August and November (76%).
Average rainfall
Keystone, WV
- Average rainfall in January:
2.17" - Average rainfall in February:
2.99" - Average rainfall in March:
2.36" - Average rainfall in April:
2.68" - Average rainfall in May:
3.19" - Average rainfall in June:
2.48"
The wettest month (with the highest rainfall) is May (3.19").
The driest month (with the least rainfall) is September (1.54").
Average rainfall days
Keystone, WV
- Average rainfall days in January:
10.1 days - Average rainfall days in February:
10.6 days - Average rainfall days in March:
13.8 days - Average rainfall days in April:
16.3 days - Average rainfall days in May:
19.7 days - Average rainfall days in June:
17.6 days
- Average rainfall days in July:
19.1 days - Average rainfall days in August:
16.1 days - Average rainfall days in September:
15.2 days - Average rainfall days in October:
12.3 days - Average rainfall days in November:
10.1 days - Average rainfall days in December:
11.6 days
The month with the highest number of rainy days is May (19.7 days).
The months with the least rainy days are January and November (10.1 days).
Average snowfall
Keystone, WV
- Average snowfall in January:
4.25" - Average snowfall in February:
4.33" - Average snowfall in March:
3.39" - Average snowfall in April:
1.06" - Average snowfall in May:
0.39" - Average snowfall in June:
0"
The month with the highest snowfall is December (4.41").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Keystone, WV
- Average snowfall days in January:
10.5 days - Average snowfall days in February:
8.8 days - Average snowfall days in March:
5.5 days - Average snowfall days in April:
1.6 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:
0.9 days - Average snowfall days in November:
3.2 days - Average snowfall days in December:
7.8 days
The month with the highest number of snowfall days is January (10.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Keystone, WV
- Average daylight in January:
9h and 5min - Average daylight in February:
10h and 5min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 1min - Average daylight in May:
14h and 1min - Average daylight in June:
14h and 4min
- Average daylight in July:
14h and 2min - Average daylight in August:
13h and 4min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 1min - Average daylight in November:
10h and 1min - Average daylight in December:
9h and 4min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January:
4h and 1min - Average sunshine in February:
5h and 1min - Average sunshine in March:
6h and 1min - Average sunshine in April:
8h and 2min - Average sunshine in May:
9h and 1min - Average sunshine in June:
10h and 0min
- Average sunshine in July:
10h and 0min - Average sunshine in August:
10h and 1min - Average sunshine in September:
8h and 2min - Average sunshine in October:
6h and 1min - Average sunshine in November:
5h and 4min - Average sunshine in December:
4h and 4min
The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days
Keystone, WV
- Average sunshine days in January:
12.4 days - Average sunshine days in February:
10.8 days - Average sunshine days in March:
12.8 days - Average sunshine days in April:
12 days - Average sunshine days in May:
9.2 days - Average sunshine days in June:
10.8 days
- Average sunshine days in July:
9.6 days - Average sunshine days in August:
12.2 days - Average sunshine days in September:
11.8 days - Average sunshine days in October:
16.5 days - Average sunshine days in November:
17.9 days - Average sunshine days in December:
13.8 days
The month with the most sunshine days is November (17.9 days).
The month with the least sunshine days is May (9.2 days).
Average UV index
Keystone, WV
The months with the highest UV index are June and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover
Keystone, WV
The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are June and August (Cloud cover 36).
Average visibility
Keystone, WV
The months with the highest visibility are April and November (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October and December (5mi).
Keystone, West Virginia, USA
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