Climate and monthly weather forecastWilliamstown, IN
Climate and monthly weather forecast
Weather in January
January, the same as December, is an icy winter month in Williamstown, Indiana, with temperature in the range of an average low of 21.9°F (-5.6°C) and an average high of 34.7°F (1.5°C). Williamstown's January weather, marked by an average high temperature of 34.7°F (1.5°C) and an average low temperature of 21.9°F (-5.6°C), is the coldest in the year. Weather in January »Weather in February
February, the last month of the winter in Williamstown, is another cold month, with an average temperature varying between 25.7°F (-3.5°C) and 39.4°F (4.1°C). The initiation of February sees an average high-temperature of a still icy 39.4°F (4.1°C), showing minor variations from the previous month. Weather in February »Weather in March
The first month of the spring, March, is a fresh month in Williamstown, Indiana, with an average temperature fluctuating between 34.9°F (1.6°C) and 50.5°F (10.3°C). March marks a rise in the average high-temperature, moving from February's wintry 39.4°F (4.1°C) to a cool 50.5°F (10.3°C). Weather in March »Weather in April
April is a refreshing spring month in Williamstown, Indiana, with an average temperature ranging between max 62.2°F (16.8°C) and min 45.5°F (7.5°C). Williamstown's April weather brings a rise in high-temperatures, moving from a fresh 50.5°F (10.3°C) in March to an enjoyable 62.2°F (16.8°C). Weather in April »Weather in May
May, the last month of the spring in Williamstown, is an agreeable month, with an average temperature varying between 55.6°F (13.1°C) and 72.1°F (22.3°C). Entering May, Williamstown sees a temperature rise, with the average high-temperature advancing from April's refreshing 62.2°F (16.8°C) to an agreeable 72.1°F (22.3°C). Weather in May »Weather in June
June, the first month of the summer in Williamstown, is a warm month, with an average temperature ranging between max 79.3°F (26.3°C) and min 62.8°F (17.1°C). June signals a minor shift in the average high-temperature, moving from May's pleasant 72.1°F (22.3°C) to a warm 79.3°F (26.3°C). Weather in June »Weather in July
July, the same as June, is another warm summer month in Williamstown, Indiana, with an average temperature varying between 64.9°F (18.3°C) and 82°F (27.8°C). The average temperatures reach their apex in July, averaging 82°F (27.8°C) at the high end and 64.9°F (18.3°C) at the low end. In July, the average heat index is calculated to be a tropical 89.6°F (32°C). Weather in July »Weather in August
The last month of the summer, August, is another warm month in Williamstown, Indiana, with an average temperature fluctuating between 81.3°F (27.4°C) and 63.1°F (17.3°C). August's arrival shows an average high-temperature of a still moderately hot 81.3°F (27.4°C), hardly different from the previous month. Weather in August »Weather in September
The first month of the autumn, September, is also a moderately hot month in Williamstown, Indiana, with temperature in the range of an average high of 75.7°F (24.3°C) and an average low of 58.1°F (14.5°C). September's arrival coincides with a soft drop in the average high-temperature, subtly decreasing from August's 81.3°F (27.4°C) to a still moderately hot 75.7°F (24.3°C). Weather in September »Weather in October
October, like September, in Williamstown, Indiana, is another comfortable autumn month, with an average temperature fluctuating between 46.9°F (8.3°C) and 63.7°F (17.6°C). The transition into October involves a decrease in the average high-temperature, falling from a moderately hot 75.7°F (24.3°C) in September to a refreshing 63.7°F (17.6°C). Weather in October »Weather in November
The last month of the autumn, November, is also a fresh month in Williamstown, Indiana, with an average temperature fluctuating between 50°F (10°C) and 36.3°F (2.4°C). The average high-temperature decreases in November, shifting from an enjoyable 63.7°F (17.6°C) in October to a cool 50°F (10°C). Weather in November »Weather in December
The first month of the winter, December, is also a wintry month in Williamstown, Indiana, with an average temperature ranging between max 40.1°F (4.5°C) and min 29.3°F (-1.5°C). The arrival of December corresponds with a temperature reduction, down from November's fresh 50°F (10°C) to a cold 40.1°F (4.5°C). Weather in December »Updated: Aug 19, 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
Temperature readings reach their annual highs in January, averaging 34.7°F (1.5°C) and a minimum average of 21.9°F (-5.6°C).
The months with the highest humidity are January and December, with an average relative humidity of 82%.
In Williamstown, during the entire year, the rain falls for 161.3 days and collects up to 31.26" (794mm) of precipitation.
Months with snowfall are January through April, October through December.
Throughout the year, there are 35 snowfall days, and 10.67" (271mm) of snow is accumulated.
The month with the least sunshine is January, with an average of 3.9h of sunshine.
The month with the most snowfall is February, when snow falls for 8.2 days and typically aggregates up to 2.64" (67mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Williamstown, 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.
The month with the most rainfall is May, when the rain falls for 19.3 days and typically aggregates up to 3.78" (96mm) of precipitation.
In Williamstown, snow does not fall in May through September.
The month with the longest days in Williamstown is June, with an average of 14h and 54min of daylight.
The months with the highest UV index are June through August, with an average maximum UV index of 6.
Williamstown witnesses the warmest weather in July, with temperatures averaging a high of 82°F (27.8°C) and a low of 64.9°F (18.3°C).
July has the most sunshine of the year, with an average of 10.1h of sunshine.
September is the month with the least rainfall. Rain falls for 13.7 days and accumulates 1.97" (50mm) of precipitation.
October is the least humid month, with an average relative humidity of 74%.
With an average of 9h and 24min of daylight, December has the shortest days of the year in Williamstown.
December is the month with the lowest UV index, with an average maximum UV index of 1.
Average temperature
Williamstown, IN
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (34.7°F).
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (21.9°F).
Average pressure
Williamstown, IN
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.1"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.96"Hg - Average pressure in May:
29.97"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.14"Hg - Average pressure in December:
30.12"Hg
The months with the highest atmospheric pressure are January and November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed
Williamstown, IN
- Average wind speed in January:
9.6mph - Average wind speed in February:
9.5mph - Average wind speed in March:
9.2mph - Average wind speed in April:
9.4mph - Average wind speed in May:
7.5mph - Average wind speed in June:
6.6mph
- Average wind speed in July:
5.6mph - Average wind speed in August:
5.6mph - Average wind speed in September:
6.3mph - Average wind speed in October:
8mph - Average wind speed in November:
8.5mph - Average wind speed in December:
8.9mph
The windiest month (with the highest average wind speed) is January (9.6mph).
The calmest months (with the lowest average wind speed) are July and August (5.6mph).
Average humidity
Williamstown, IN
The months with the highest relative humidity are January and December (82%).
The month with the lowest relative humidity is October (74%).
Average rainfall
Williamstown, IN
- Average rainfall in January:
2.32" - Average rainfall in February:
2.28" - Average rainfall in March:
2.72" - Average rainfall in April:
3.43" - Average rainfall in May:
3.78" - Average rainfall in June:
2.95"
The wettest month (with the highest rainfall) is May (3.78").
The driest month (with the least rainfall) is September (1.97").
Average rainfall days
Williamstown, IN
- Average rainfall days in January:
9.8 days - Average rainfall days in February:
8.4 days - Average rainfall days in March:
14.3 days - Average rainfall days in April:
15.8 days - Average rainfall days in May:
19.3 days - Average rainfall days in June:
16.4 days
- Average rainfall days in July:
16.3 days - Average rainfall days in August:
13.9 days - Average rainfall days in September:
13.7 days - Average rainfall days in October:
12.4 days - Average rainfall days in November:
10.3 days - Average rainfall days in December:
10.7 days
The month with the highest number of rainy days is May (19.3 days).
The month with the least rainy days is February (8.4 days).
Average snowfall
Williamstown, IN
The month with the highest snowfall is February (2.64").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Williamstown, IN
- Average snowfall days in January:
9.8 days - Average snowfall days in February:
8.2 days - Average snowfall days in March:
5.1 days - Average snowfall days in April:
0.9 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:
0.3 days - Average snowfall days in November:
2.8 days - Average snowfall days in December:
7.8 days
The month with the highest number of snowfall days is January (9.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Williamstown, IN
- Average daylight in January:
9h and 48min - 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:
14h and 54min
- Average daylight in July:
14h and 36min - 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: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in January:
3h and 54min - Average sunshine in February:
5h and 6min - Average sunshine in March:
5h and 54min - Average sunshine in April:
7h and 12min - Average sunshine in May:
8h and 36min - Average sunshine in June:
10h and 0min
- Average sunshine in July:
10h and 6min - Average sunshine in August:
9h and 36min - Average sunshine in September:
8h and 12min - Average sunshine in October:
6h and 42min - Average sunshine in November:
5h and 24min - Average sunshine in December:
4h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days
Williamstown, IN
- Average sunshine days in January:
13 days - Average sunshine days in February:
12.6 days - Average sunshine days in March:
12.4 days - Average sunshine days in April:
12.2 days - Average sunshine days in May:
9.9 days - Average sunshine days in June:
11 days
- Average sunshine days in July:
11.4 days - Average sunshine days in August:
13.8 days - Average sunshine days in September:
14 days - Average sunshine days in October:
16.2 days - Average sunshine days in November:
16.8 days - Average sunshine days in December:
13.8 days
The month with the most sunshine days is November (16.8 days).
The month with the least sunshine days is May (9.9 days).
Average UV index
Williamstown, IN
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover
Williamstown, IN
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility
Williamstown, IN
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).
