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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, like December, in Mercersburg, Pennsylvania, is an icy winter month, with an average temperature fluctuating between 35.2°F (1.8°C) and 22.1°F (-5.5°C). January, with average temperatures reaching a high of 35.2°F (1.8°C) and a low of 22.1°F (-5.5°C), is the coldest month. Weather in January »
Weather in February
The last month of the winter, February, is another cold month in Mercersburg, Pennsylvania, with temperature in the range of an average low of 24.3°F (-4.3°C) and an average high of 39.7°F (4.3°C). February's presence marks an average high-temperature of a still wintry 39.7°F (4.3°C), subtly varied from January's 35.2°F (1.8°C). Weather in February »
Weather in March
The first month of the spring, March, is a chilly month in Mercersburg, Pennsylvania, with an average temperature varying between 31.8°F (-0.1°C) and 48.6°F (9.2°C). A slight uplift in the average high-temperature marks March, adjusting from February's icy 39.7°F (4.3°C) to a chilly 48.6°F (9.2°C). Weather in March »
Weather in April
April in Mercersburg, Pennsylvania, is a refreshing spring month, with an average temperature varying between 41.5°F (5.3°C) and 61.2°F (16.2°C). Mercersburg's weather shows a temperature rise with the arrival of April, moving from a frosty 48.6°F (9.2°C) in March to a refreshing 61.2°F (16.2°C). Weather in April »
Weather in May
The last month of the spring, May, is a pleasant month in Mercersburg, Pennsylvania, with an average temperature ranging between min 51.4°F (10.8°C) and max 71.2°F (21.8°C). With the beginning of May, Mercersburg's average high-temperature sees an increase, transitioning from a comfortable 61.2°F (16.2°C) in April to an agreeable 71.2°F (21.8°C). Weather in May »
Weather in June
June, the first month of the summer in Mercersburg, is a warm month, with an average temperature varying between 79.5°F (26.4°C) and 57.9°F (14.4°C). As May gives way to June, the average high-temperature displays a slight ascent, adjusting from a pleasant 71.2°F (21.8°C) to a moderately hot 79.5°F (26.4°C). Weather in June »
Weather in July
July, like June, in Mercersburg, Pennsylvania, is another warm summer month, with temperature in the range of an average high of 84.7°F (29.3°C) and an average low of 62.6°F (17°C). July, recording an average high temperature of 84.7°F (29.3°C) and a low temperature of 62.6°F (17°C), is Mercersburg's warmest month. The heat index value for July is appraised at a hot 93.2°F (34°C). Weather in July »
Weather in August
The last month of the summer, August, is another warm month in Mercersburg, Pennsylvania, with an average temperature ranging between min 61.3°F (16.3°C) and max 82°F (27.8°C). The onset of August marks an average high-temperature of a still warm 82°F (27.8°C), hardly differing from July's 84.7°F (29.3°C). Weather in August »
Weather in September
September, the first month of the autumn in Mercersburg, is still a warm month, with an average temperature fluctuating between 75°F (23.9°C) and 55.4°F (13°C). A mild shift in the average high-temperature occurs in September, reducing from 82°F (27.8°C) in August to a still moderately hot 75°F (23.9°C). Weather in September »
Weather in October
October, like September, in Mercersburg, Pennsylvania, is another comfortable autumn month, with an average temperature ranging between min 45.5°F (7.5°C) and max 63.3°F (17.4°C). 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). Weather in October »
Weather in November
The last month of the autumn, November, is another cool month in Mercersburg, Pennsylvania, with an average temperature fluctuating between 50.4°F (10.2°C) and 34.5°F (1.4°C). November's arrival coincides with a drop in the average high-temperature, decreasing from October's refreshing 63.3°F (17.4°C) to a fresh 50.4°F (10.2°C). Weather in November »
Weather in December
The first month of the winter, December, is still a cold month in Mercersburg, Pennsylvania, with an average temperature ranging between min 28.9°F (-1.7°C) and max 40.8°F (4.9°C). During Mercersburg's transition into December, the average high-temperature lessens, moving from a fresh 50.4°F (10.2°C) in November to a wintry 40.8°F (4.9°C). Weather in December »
[Resources]Frequently asked questions
What part of the year is the coldest in Mercersburg?
Mercersburg's temperature records reveal January as the coldest month, marked by average highs of 35.2°F (1.8°C) and lows of 22.1°F (-5.5°C).
How much does it rain in Mercersburg?
In Mercersburg, during the entire year, the rain falls for 170.5 days and collects up to 31.02" (788mm) of precipitation.
When does it snow in Mercersburg?
January through April, October through December are months with snowfall.
What is the snowiest month in Mercersburg?
The month with the most snowfall in Mercersburg, Pennsylvania, is January, when snow falls for 9.9 days and typically aggregates up to 5.2" (132mm) of snow.
How many days does it snow in Mercersburg?
Throughout the year, there are 33.6 snowfall days, and 17.91" (455mm) of snow is accumulated.
What is the month with the least sunshine in Mercersburg?
The month with the least sunshine in Mercersburg, Pennsylvania, is January, with an average of 4.6h of sunshine.
What is the month with the lowest UV index in Mercersburg?
The months with the lowest UV index in Mercersburg are January through March, November and December, with an average maximum UV index of 2.
What are the most humid months in Mercersburg?
The months with the highest humidity in Mercersburg, Pennsylvania, are February, May, October and December, with an average relative humidity of 79%.
When is Daylight Saving Time (DST) in Mercersburg?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Mercersburg, Pennsylvania, 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 are the least humid months in Mercersburg?
April and July, with an average relative humidity of 75%, are the least humid months in Mercersburg.
What is the wettest month in Mercersburg?
May is the month with the most rainfall. Rain falls for 18.8 days and accumulates 3.19" (81mm) of precipitation.
When it does not snow in Mercersburg?
In Mercersburg, Pennsylvania, snow does not fall in May through September.
What is the month with the highest UV index in Mercersburg?
May through July, with an average maximum UV index of 6, are months with the highest UV index in Mercersburg.
When are the longest days in Mercersburg?
With an average of 14h and 54min of daylight, June has the longest days of the year.
What time of the year is the hottest in Mercersburg?
The temperatures in Mercersburg reach their highest averages in July, with highs of 84.7°F (29.3°C) and lows of 62.6°F (17°C).
What month has the most sunshine in Mercersburg?
With an average of 10.5h of sunshine, July has the most sunshine of the year in Mercersburg, Pennsylvania.
What is the driest month in Mercersburg?
September is the month with the least rainfall in Mercersburg, Pennsylvania. Rain falls for 14 days and accumulates 2.05" (52mm) of precipitation.
What is the month with the shortest days in Mercersburg?
The month with the shortest days in Mercersburg, Pennsylvania, is December, with an average of 9h and 24min of daylight.
Average temperature
Mercersburg, PA
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).
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
Mercersburg, PA
- Average pressure in January:
30.11"Hg - Average pressure in February:
30.07"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.98"Hg - Average pressure in May:
30.01"Hg - Average pressure in June:
29.95"Hg
- Average pressure in July:
29.98"Hg - Average pressure in August:
30"Hg - Average pressure in September:
30.06"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.14"Hg - Average pressure in December:
30.11"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
Mercersburg, PA
- Average wind speed in January:
7.5mph - Average wind speed in February:
7.4mph - Average wind speed in March:
7.3mph - Average wind speed in April:
7.3mph - Average wind speed in May:
5.7mph - Average wind speed in June:
5.3mph
- Average wind speed in July:
4.4mph - Average wind speed in August:
4.3mph - Average wind speed in September:
4.8mph - Average wind speed in October:
6mph - Average wind speed in November:
6.4mph - Average wind speed in December:
6.8mph
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
Mercersburg, PA
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
Mercersburg, PA
- Average rainfall in January:
2.2" - Average rainfall in February:
2.2" - Average rainfall in March:
2.32" - Average rainfall in April:
2.99" - Average rainfall in May:
3.19" - Average rainfall in June:
2.6"
- Average rainfall in July:
3.03" - Average rainfall in August:
2.83" - Average rainfall in September:
2.05" - Average rainfall in October:
2.87" - Average rainfall in November:
2.2" - Average rainfall in December:
2.52"
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
Mercersburg, PA
- Average rainfall days in January:
10.3 days - Average rainfall days in February:
10.8 days - Average rainfall days in March:
14.3 days - Average rainfall days in April:
16.7 days - Average rainfall days in May:
18.8 days - Average rainfall days in June:
16.5 days
- Average rainfall days in July:
17.8 days - Average rainfall days in August:
16.8 days - Average rainfall days in September:
14 days - Average rainfall days in October:
13.5 days - Average rainfall days in November:
9.9 days - Average rainfall days in December:
11.1 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
Mercersburg, PA
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
Mercersburg, PA
- Average snowfall days in January:
9.9 days - Average snowfall days in February:
9.1 days - Average snowfall days in March:
5.8 days - Average snowfall days in April:
1.3 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:
0.2 days - Average snowfall days in November:
1.4 days - Average snowfall days in December:
5.9 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 / Average sunshine
Mercersburg, PA
- Average daylight in January:
9h and 4min - Average daylight in February:
10h and 4min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 2min - Average daylight in June:
14h and 5min
- Average daylight in July:
14h and 4min - 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 0min - Average daylight in December:
9h and 2min
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 January:
4h and 4min - Average sunshine in February:
4h and 4min - Average sunshine in March:
6h and 2min - Average sunshine in April:
8h and 2min - Average sunshine in May:
8h and 4min - Average sunshine in June:
10h and 0min
- Average sunshine in July:
10h and 3min - Average sunshine in August:
10h and 1min - Average sunshine in September:
8h and 4min - Average sunshine in October:
5h and 3min - Average sunshine in November:
5h and 4min - Average sunshine in December:
4h and 4min
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
Mercersburg, PA
- Average sunshine days in January:
14.4 days - Average sunshine days in February:
12.3 days - Average sunshine days in March:
12.4 days - Average sunshine days in April:
11 days - Average sunshine days in May:
10.3 days - Average sunshine days in June:
11.3 days
- Average sunshine days in July:
11.5 days - Average sunshine days in August:
11.9 days - Average sunshine days in September:
14.2 days - Average sunshine days in October:
15.4 days - Average sunshine days in November:
18 days - Average sunshine days in December:
15.1 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
Mercersburg, PA
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
Mercersburg, PA
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
Mercersburg, PA
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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