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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 Grantham, Pennsylvania, with an average temperature ranging between min 22.5°F (-5.3°C) and max 35.2°F (1.8°C). The lowest temperatures are recorded in January, with averages reaching a high of 35.2°F (1.8°C) and a low of 22.5°F (-5.3°C). Weather in January »
Weather in February
February, the last month of the winter in Grantham, is also a wintry month, with an average temperature varying between 24.6°F (-4.1°C) and 38.8°F (3.8°C). February ushers in an average high-temperature of a still cold 38.8°F (3.8°C), aligning closely with the preceding month. Weather in February »
Weather in March
March, the first month of the spring in Grantham, is a chilly month, with an average temperature varying between 48°F (8.9°C) and 31.6°F (-0.2°C). Grantham sees an increase in average high-temperatures during March, moving from a cold 38.8°F (3.8°C) in February to a frosty 48°F (8.9°C). Weather in March »
Weather in April
April in Grantham, Pennsylvania, is a moderate spring month, with an average temperature fluctuating between 42.3°F (5.7°C) and 60.4°F (15.8°C). As March gives way to April, the average high-temperature displays an increase, moving from a chilly 48°F (8.9°C) to a mild 60.4°F (15.8°C). Weather in April »
Weather in May
The last month of the spring, May, is a pleasant month in Grantham, Pennsylvania, with an average temperature fluctuating between 52.3°F (11.3°C) and 70.3°F (21.3°C). Grantham's transition into May brings a rise in the average high-temperature, moving from a mild 60.4°F (15.8°C) in April to a pleasant 70.3°F (21.3°C). Weather in May »
Weather in June
June, the first month of the summer in Grantham, is a moderately hot month, with an average temperature ranging between min 59.5°F (15.3°C) and max 78.3°F (25.7°C). June introduces a marginal temperature uplift, with average high-temperatures adjusting from May's pleasant 70.3°F (21.3°C) to a moderately hot 78.3°F (25.7°C). Weather in June »
Weather in July
July, like June, in Grantham, Pennsylvania, is another warm summer month, with an average temperature ranging between max 83.5°F (28.6°C) and min 64.6°F (18.1°C). Grantham's temperatures tend to reach their peak averages in July, with a high of 83.5°F (28.6°C) and a low of 64.6°F (18.1°C). The heat index value during July is evaluated at a hot 91.4°F (33°C). Weather in July »
Weather in August
August, the last month of the summer in Grantham, is another warm month, with an average temperature varying between 81.1°F (27.3°C) and 62.2°F (16.8°C). As Grantham, Pennsylvania, steps into August, the average high-temperature holds at a still moderately hot 81.1°F (27.3°C), hinting at a minor fluctuation from the prior month. Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Grantham, Pennsylvania, with an average temperature varying between 56.1°F (13.4°C) and 74.7°F (23.7°C). Grantham experiences a moderate temperature shift at the start of September, with average high-temperatures adjusting a bit from a warm 81.1°F (27.3°C) in August to a still moderately hot 74.7°F (23.7°C). Weather in September »
Weather in October
October, like September, in Grantham, Pennsylvania, is another enjoyable autumn month, with temperature in the range of an average low of 46.6°F (8.1°C) and an average high of 62.8°F (17.1°C). As September transitions to October, the average high-temperature falls from a moderately hot 74.7°F (23.7°C) to an enjoyable 62.8°F (17.1°C). Weather in October »
Weather in November
The last month of the autumn, November, is another cool month in Grantham, Pennsylvania, with an average temperature fluctuating between 35.8°F (2.1°C) and 50.5°F (10.3°C). November brings a decrease in the average high-temperature, shifting from a refreshing 62.8°F (17.1°C) in October to a cool 50.5°F (10.3°C). Weather in November »
Weather in December
December, the first month of the winter in Grantham, is also a wintry month, with an average temperature ranging between max 41°F (5°C) and min 29.7°F (-1.3°C). The commencement of December indicates a shift in the average high-temperature, receding from November's fresh 50.5°F (10.3°C) to a cold 41°F (5°C). Weather in December »
Updated: Jul 17, 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?
The coldest temperatures occur during January, when averages reach a peak of 35.2°F (1.8°C) and a low of 22.5°F (-5.3°C).
What is the driest month?
January is the month with the least rainfall. Rain falls for 6.3 days and accumulates 1.14" (29mm) of precipitation.
How many days does it rain?
Throughout the year, there are 137.7 rainfall days, and 18.43" (468mm) of precipitation is accumulated.
When does it snow?
January through April, October through December are months with snowfall.
What is the snowiest month?
The month with the most snowfall in Grantham is January, when snow falls for 7.2 days and typically aggregates up to 2.52" (64mm) of snow.
How many days does it snow?
In Grantham, during the entire year, snow falls for 23.7 days and aggregates up to 8.62" (219mm) of snow.
When is the lowest UV index?
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2.
What is the most humid month?
The months with the highest humidity are February and May, with an average relative humidity of 80%.
What is the month with the least sunshine?
February has the least sunshine of the year, with an average of 4.6h of sunshine.
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 least humid month?
April is the least humid month, with an average relative humidity of 75%.
What is the rainiest month?
The wettest months are May and July, with an average 2.05" (52mm) of rainfall.
When it does not snow?
In Grantham, snow does not fall in May through September.
What is the month with the highest UV index?
May through July, with an average maximum UV index of 6, are months with the highest UV index in Grantham.
When are the longest days?
With an average of 15h and 0min of daylight, June has the longest days of the year.
What month is the hottest?
July, known for its average high temperature of 83.5°F (28.6°C) and an average low temperature of 64.6°F (18.1°C), is the warmest month.
What month has the most sunshine?
July has the most sunshine of the year, with an average of 10.6h of sunshine.
What is the month with the shortest days?
December has the shortest days of the year, with an average of 9h and 24min of daylight.
Average temperature
Grantham, PA
The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is January (35.2°F).
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).
Average pressure
Grantham, PA
- Average pressure in January:
30.1"Hg - Average pressure in February:
30.07"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:
29.95"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:
30.04"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
Grantham, PA
- Average wind speed in January:
8.3mph - Average wind speed in February:
8.4mph - Average wind speed in March:
8.4mph - Average wind speed in April:
8.4mph - Average wind speed in May:
6.5mph - Average wind speed in June:
6mph
- Average wind speed in July:
5mph - Average wind speed in August:
5mph - Average wind speed in September:
5.5mph - Average wind speed in October:
6.8mph - Average wind speed in November:
7.3mph - Average wind speed in December:
7.8mph
The windiest months (with the highest average wind speed) are February, March and April (8.4mph).
The calmest months (with the lowest average wind speed) are July and August (5mph).
Average humidity
Grantham, PA
The months with the highest relative humidity are February and May (80%).
The month with the lowest relative humidity is April (75%).
Average rainfall
Grantham, PA
- Average rainfall in January:
1.14" - Average rainfall in February:
1.26" - Average rainfall in March:
1.3" - Average rainfall in April:
1.46" - Average rainfall in May:
2.05" - Average rainfall in June:
1.61"
- Average rainfall in July:
2.05" - Average rainfall in August:
1.97" - Average rainfall in September:
1.34" - Average rainfall in October:
1.69" - Average rainfall in November:
1.3" - Average rainfall in December:
1.26"
The wettest months (with the highest rainfall) are May and July (2.05").
The driest month (with the least rainfall) is January (1.14").
Average rainfall days
Grantham, PA
- Average rainfall days in January:
6.3 days - Average rainfall days in February:
7.4 days - Average rainfall days in March:
10.8 days - Average rainfall days in April:
14.3 days - Average rainfall days in May:
15.6 days - Average rainfall days in June:
15.1 days
- Average rainfall days in July:
15 days - Average rainfall days in August:
13.9 days - Average rainfall days in September:
11.1 days - Average rainfall days in October:
10.8 days - Average rainfall days in November:
7.9 days - Average rainfall days in December:
9.5 days
The month with the highest number of rainy days is May (15.6 days).
The month with the least rainy days is January (6.3 days).
Average snowfall
Grantham, PA
The month with the highest snowfall is January (2.52").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Grantham, PA
- Average snowfall days in January:
7.2 days - Average snowfall days in February:
5.9 days - Average snowfall days in March:
4.9 days - Average snowfall days in April:
0.6 days - Average snowfall days in May:
0.1 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:
0.5 days - Average snowfall days in December:
4.4 days
The month with the highest number of snowfall days is January (7.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Grantham, 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:
15h and 0min
- 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: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in January:
4h and 5min - Average sunshine in February:
4h and 4min - Average sunshine in March:
6h and 3min - Average sunshine in April:
8h and 2min - Average sunshine in May:
8h and 3min - Average sunshine in June:
10h and 0min
- Average sunshine in July:
10h and 4min - Average sunshine in August:
10h and 1min - Average sunshine in September:
8h and 5min - Average sunshine in October:
5h and 2min - Average sunshine in November:
5h and 3min - Average sunshine in December:
4h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days
Grantham, PA
- Average sunshine days in January:
19.1 days - Average sunshine days in February:
15.8 days - Average sunshine days in March:
15.7 days - Average sunshine days in April:
13.3 days - Average sunshine days in May:
12.2 days - Average sunshine days in June:
12.6 days
- Average sunshine days in July:
13 days - Average sunshine days in August:
13.8 days - Average sunshine days in September:
16.6 days - Average sunshine days in October:
17.5 days - Average sunshine days in November:
20 days - Average sunshine days in December:
18.1 days
The month with the most sunshine days is November (20 days).
The month with the least sunshine days is May (12.2 days).
Average UV index
Grantham, 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
Grantham, PA
The months with the most cloud cover are February and December (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility
Grantham, PA
The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).
Grantham, Pennsylvania, USA
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