Climate and monthly weather forecastMount Gretna, PA
Climate and monthly weather forecast
Weather in January
January, the same as December, is another cold winter month in Mount Gretna, Pennsylvania, with an average temperature varying between 21.6°F (-5.8°C) and 33.8°F (1°C). January brings the lowest temperatures, with an average high of 33.8°F (1°C) and an average low of 21.6°F (-5.8°C). Weather in January »Weather in February
February, the last month of the winter in Mount Gretna, is also a wintry month, with an average temperature varying between 23.5°F (-4.7°C) and 37.9°F (3.3°C). In February, the average high-temperature registers at a still cold 37.9°F (3.3°C), nearly identical to January's 33.8°F (1°C). Weather in February »Weather in March
March, the first month of the spring in Mount Gretna, is a chilly month, with an average temperature fluctuating between 31.1°F (-0.5°C) and 46.9°F (8.3°C). As Mount Gretna transitions into March, the average high-temperature shows a change, moving from an icy 37.9°F (3.3°C) in February to a frosty 46.9°F (8.3°C). Weather in March »Weather in April
April in Mount Gretna, Pennsylvania, is a mild spring month, with an average temperature varying between 59.4°F (15.2°C) and 41.4°F (5.2°C). The start of April signals an increase in the average high-temperature, moving from a frosty 46.9°F (8.3°C) in March to a refreshing 59.4°F (15.2°C). Weather in April »Weather in May
The last month of the spring, May, is an agreeable month in Mount Gretna, Pennsylvania, with temperature in the range of an average low of 51.1°F (10.6°C) and an average high of 68.7°F (20.4°C). Mount Gretna experiences a temperature shift with the start of May, with average high-temperatures moving from a mild 59.4°F (15.2°C) in April to an agreeable 68.7°F (20.4°C). Weather in May »Weather in June
The first month of the summer, June, is a moderately hot month in Mount Gretna, Pennsylvania, with an average temperature fluctuating between 76.6°F (24.8°C) and 58.6°F (14.8°C). With the onset of June, Mount Gretna observes a minor temperature ascent, with the average high-temperature adjusting from May's pleasant 68.7°F (20.4°C) to a warm 76.6°F (24.8°C). Weather in June »Weather in July
July, the same as June, is a moderately hot summer month in Mount Gretna, Pennsylvania, with an average temperature varying between 63.1°F (17.3°C) and 82°F (27.8°C). In Mount Gretna, temperatures reach their average annual highs in July, measuring 82°F (27.8°C) and a minimum average of 63.1°F (17.3°C). Throughout July, the heat index is evaluated at a hot 87.8°F (31°C). Weather in July »Weather in August
August, the last month of the summer in Mount Gretna, is another warm month, with an average temperature varying between 61.7°F (16.5°C) and 79.9°F (26.6°C). In August, Mount Gretna's weather conditions record an average high-temperature of a still warm 79.9°F (26.6°C), demonstrating little divergence from the preceding month. Weather in August »Weather in September
The first month of the autumn, September, is also a moderately hot month in Mount Gretna, Pennsylvania, with an average temperature fluctuating between 55.4°F (13°C) and 73.8°F (23.2°C). In Mount Gretna, entering September brings a subtle temperature decrement, reducing from August's warm 79.9°F (26.6°C) to a still moderately hot 73.8°F (23.2°C). Weather in September »Weather in October
October, the same as September, is another refreshing autumn month in Mount Gretna, Pennsylvania, with an average temperature fluctuating between 61.7°F (16.5°C) and 46°F (7.8°C). During Mount Gretna's transition into October, the average high-temperature lessens, moving from a moderately hot 73.8°F (23.2°C) in September to a comfortable 61.7°F (16.5°C). Weather in October »Weather in November
The last month of the autumn, November, is another chilly month in Mount Gretna, Pennsylvania, with temperature in the range of an average low of 34.9°F (1.6°C) and an average high of 49.5°F (9.7°C). The transition into November is accompanied by a temperature decrease, with the average high-temperature shifting from a comfortable 61.7°F (16.5°C) in October to a frosty 49.5°F (9.7°C). Weather in November »Weather in December
The first month of the winter, December, is also an icy month in Mount Gretna, Pennsylvania, with an average temperature fluctuating between 29.3°F (-1.5°C) and 40.3°F (4.6°C). In December, the average high-temperature decreases from a chilly 49.5°F (9.7°C) in November to an icy 40.3°F (4.6°C). Weather in December »Updated: Aug 6, 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 brings the lowest temperatures, with an average high of 33.8°F (1°C) and an average low of 21.6°F (-5.8°C).
Throughout the year, there are 137.4 rainfall days, and 16.26" (413mm) of precipitation is accumulated.
January through May, October through December are months with snowfall.
The month with the most snowfall is January, when snow falls for 5.2 days and typically aggregates up to 1.97" (50mm) of snow.
Throughout the year, there are 19.5 snowfall days, and 6.69" (170mm) of snow is accumulated.
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
February, May and October, with an average relative humidity of 81%, are most humid months.
The month with the least rainfall is February, when the rain falls for 7.8 days and typically collects 0.94" (24mm) of precipitation.
The month with the least sunshine is February, with an average of 4.5h of sunshine.
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.
April is the least humid month, with an average relative humidity of 76%.
The months with the highest UV index in Mount Gretna are May through July, with an average maximum UV index of 6.
June through September are months without snowfall.
June has the longest days of the year, with an average of 15h and 0min of daylight.
The average temperatures reach their apex in July, averaging 82°F (27.8°C) at the high end and 63.1°F (17.3°C) at the low end.
The month with the most sunshine is July, with an average of 10.4h of sunshine.
August is the month with the most rainfall. Rain falls for 14.7 days and accumulates 2.13" (54mm) of precipitation.
December has the shortest days of the year, with an average of 9h and 24min of daylight.
Average temperature
Mount Gretna, PA
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (33.8°F).
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).
Average pressure
Mount Gretna, PA
- Average pressure in January:
30.09"Hg - Average pressure in February:
30.06"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.99"Hg - Average pressure in May:
30.01"Hg - Average pressure in June:
29.94"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
30"Hg - Average pressure in September:
30.06"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.13"Hg - Average pressure in December:
30.1"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed
Mount Gretna, PA
- Average wind speed in January:
8.5mph - Average wind speed in February:
8.6mph - Average wind speed in March:
8.8mph - Average wind speed in April:
8.6mph - Average wind speed in May:
6.6mph - Average wind speed in June:
6.1mph
The windiest month (with the highest average wind speed) is March (8.8mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity
Mount Gretna, PA
The months with the highest relative humidity are February, May and October (81%).
The month with the lowest relative humidity is April (76%).
Average rainfall
Mount Gretna, PA
- Average rainfall in January:
1.06" - Average rainfall in February:
0.94" - Average rainfall in March:
1.18" - Average rainfall in April:
1.26" - Average rainfall in May:
1.61" - Average rainfall in June:
1.38"
- Average rainfall in July:
1.93" - Average rainfall in August:
2.13" - Average rainfall in September:
1.02" - Average rainfall in October:
1.42" - Average rainfall in November:
1.22" - Average rainfall in December:
1.1"
The wettest month (with the highest rainfall) is August (2.13").
The driest month (with the least rainfall) is February (0.94").
Average rainfall days
Mount Gretna, PA
- Average rainfall days in January:
6.7 days - Average rainfall days in February:
7.8 days - Average rainfall days in March:
10.9 days - Average rainfall days in April:
12.7 days - Average rainfall days in May:
15.9 days - Average rainfall days in June:
14.8 days
- Average rainfall days in July:
15.6 days - Average rainfall days in August:
14.7 days - Average rainfall days in September:
10.5 days - Average rainfall days in October:
11.4 days - Average rainfall days in November:
7.2 days - Average rainfall days in December:
9.2 days
The month with the highest number of rainy days is May (15.9 days).
The month with the least rainy days is January (6.7 days).
Average snowfall
Mount Gretna, PA
- Average snowfall in January:
1.97" - Average snowfall in February:
1.5" - Average snowfall in March:
1.65" - Average snowfall in April:
0.04" - Average snowfall in May:
0.04" - Average snowfall in June:
0"
The month with the highest snowfall is January (1.97").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Mount Gretna, PA
- Average snowfall days in January:
5.2 days - Average snowfall days in February:
5.1 days - Average snowfall days in March:
4.2 days - Average snowfall days in April:
0.3 days - Average snowfall days in May:
0.2 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:
0.1 days - Average snowfall days in November:
1.1 days - Average snowfall days in December:
3.3 days
The month with the highest number of snowfall days is January (5.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Mount Gretna, PA
- Average daylight in January:
9h and 42min - 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 24min - Average daylight in June:
15h and 0min
- Average daylight in July:
14h and 42min - Average daylight in August:
13h and 42min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 6min - Average daylight in November:
10h and 0min - Average daylight in December:
9h and 24min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in January:
4h and 36min - Average sunshine in February:
4h and 30min - Average sunshine in March:
6h and 18min - Average sunshine in April:
8h and 6min - Average sunshine in May:
8h and 12min - Average sunshine in June:
9h and 48min
- Average sunshine in July:
10h and 24min - Average sunshine in August:
9h and 48min - Average sunshine in September:
8h and 48min - Average sunshine in October:
5h and 18min - Average sunshine in November:
5h and 18min - Average sunshine in December:
4h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days
Mount Gretna, PA
- Average sunshine days in January:
20.3 days - Average sunshine days in February:
15.3 days - Average sunshine days in March:
16.3 days - Average sunshine days in April:
15.3 days - Average sunshine days in May:
11.5 days - Average sunshine days in June:
12.3 days
- Average sunshine days in July:
11.8 days - Average sunshine days in August:
13.4 days - Average sunshine days in September:
16.5 days - Average sunshine days in October:
17.5 days - Average sunshine days in November:
19.6 days - Average sunshine days in December:
18.7 days
The month with the most sunshine days is January (20.3 days).
The month with the least sunshine days is May (11.5 days).
Average UV index
Mount Gretna, 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
Mount Gretna, PA
The months with the most cloud cover are February and December (Cloud cover 51).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility
Mount Gretna, PA
The months with the highest visibility are January, February, March, April, June, July, November and December (6mi).
The months with the lowest visibility are May, August, September and October (5mi).
