Contents
- Weather in October
- Frequently asked questions
- Average temperature in October
- Average pressure in October
- Average wind speed in October
- Average humidity in October
- Average rainfall in October
- Average rainfall days in October
- Average snowfall in October
- Average snowfall days in October
- Average daylight in October
- Average sunshine in October
- Average sunshine days in October
- Average UV index in October
- Average cloud cover in October
- Average visibility in October
Weather in October
Temperature
During the transition into October, Mercersburg observes a decrease in the average high-temperature, falling from a warm 75°F (23.9°C) in September to a refreshing 63.3°F (17.4°C). Mercersburg's nights in October cool down to an average low-temperature of 45.5°F (7.5°C).Humidity
The months with the highest humidity are February, May, October and December, with an average relative humidity of 79%.Rainfall
In Mercersburg, during October, the rain falls for 13.5 days and regularly aggregates up to 2.87" (73mm) of precipitation. In Mercersburg, during the entire year, the rain falls for 170.5 days and collects up to 31.02" (788mm) of precipitation.Snowfall
January through April, October through December are months with snowfall in Mercersburg. October is the first month it typically snows in Mercersburg, Pennsylvania. Throughout October, in the average 0.2 snowfall days, it receives 0.35" (9mm) of snow. Throughout the year, there are 33.6 snowfall days, and 17.91" (455mm) of snow is accumulated.Daylight
The average length of the day in October in Mercersburg is 11h and 8min.On the first day of October, sunrise is at 7:08 am and sunset at 6:53 pm. On the last day of the month, sunrise is at 7:40 am and sunset at 6:10 pm EDT.
Sunshine
The average sunshine in October is 5.5h.UV index
In October, the average daily maximum UV index in Mercersburg is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The UV index of 3 in October translates into these instructions:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Frequently asked questions
What are the temperatures in Mercersburg in October?
What is the most humid month in Mercersburg?
What is the average humidity in October in Mercersburg?
How many days does it rain in October in Mercersburg?
When does it start to snow in Mercersburg?
What is the average length of the day in October in Mercersburg?
When is the sunrise / sunset in October in Mercersburg?
How many hours of sunshine does Mercersburg have in October?
What is the UV index intensity in October in Mercersburg?
Average temperature in October
Mercersburg, PA
- Average high temperature in October: 63.3°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (35.2°F).
- Average low temperature in October: 45.5°F
The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (22.1°F).
Average pressure in October
Mercersburg, PA
- Average pressure in October: 30.04"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in October
Mercersburg, PA
- Average wind speed in October: 6mph
The windiest month (with the highest average wind speed) is January (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.3mph).
Average humidity in October
Mercersburg, PA
- Average humidity in October: 79%
The months with the highest relative humidity are February, May, October and December (79%).
The months with the lowest relative humidity are April and July (75%).
Average rainfall in October
Mercersburg, PA
- Average rainfall in October: 2.87"
The wettest month (with the highest rainfall) is May (3.19").
The driest month (with the least rainfall) is September (2.05").
Average rainfall days in October
Mercersburg, PA
- Average rainfall days in October: 13.5 days
The month with the highest number of rainy days is May (18.8 days).
The month with the least rainy days is November (9.9 days).
Average snowfall in October
Mercersburg, PA
- Average snowfall in October: 0.35"
The month with the highest snowfall is January (5.2").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in October
Mercersburg, PA
- Average snowfall days in October: 0.2 days
The month with the highest number of snowfall days is January (9.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in October /
Average sunshine in October
Mercersburg, PA
- Average daylight in October: 11h and 1min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in October: 5h and 3min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in October
Mercersburg, PA
- Average sunshine days in October: 15.4 days
The month with the most sunshine days is November (18 days).
The month with the least sunshine days is May (10.3 days).
Average UV index in October
Mercersburg, PA
- Average UV index in October: 3
The months with the highest UV index are May, June and July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in October
Mercersburg, PA
- Average cloud cover in October: 42
The months with the most cloud cover are January, February and December (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in October
Mercersburg, PA
- Average visibility in October: 5mi
The months with the highest visibility are April, June, July and November (6mi).
The months with the lowest visibility are January, February, March, May, August, September, October and December (5mi).
Mercersburg, Pennsylvania, USA
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