Climate and monthly weather forecastWashington, PA
Climate and monthly weather forecast
The climate of Washington
Looking at the annual climate observations, it becomes clear that Washington, Pennsylvania, USA, falls into the Köppen climate classification of Cfa. This humidity-dominant categorization tells of an area baring a humid subtropical climate with no defined dry season. Located in the northeastern segment of the United States, Washington experiences an array of varied weather throughout the year.Each of the multiple climate parameters paints a vivid picture of Washington's weather scene. Observations uncover close alignment with the categorization as a Cfa climate zone. The highs and lows of temperature, the frequency of rainfall, and the duration of daylight among other factors collectively shape the state of the weather. Starting from a low of 20.8°F (-6.2°C) in the winter months, the temperature ascends to peak at an average high of 83.3°F (28.5°C) in the height of summer. The rainfall, without a straightforward pattern, ranges from a minimum of 0.94" (24mm) to a maximum of 1.65" (42mm), with varying numbers of rainy days spread across the year.
Further insight reveals unique weather peculiarities. July, a summer month, stands out with the highest average temperature of 83.3°F (28.5°C) balanced with the maximum number of daylight hours at 15 units. Interestingly, May records the highest average rainfall in millimeters, despite being a transitional month between spring and summer. Conversely, December and January go for long stretches without rainfall, rounded up with impressive snowfall reaching up to 1.06" (27mm) in December.
The best time to visit Washington
Factoring in all climatic variables, late spring to early fall emerges as the ideal period to visit Washington. Notably, the months from May to September offer a range of pleasant temperatures starting at 61.3°F (16.3°C) to 82°F (27.8°C), paired with a consistent daylight duration of between 13.3 hours and 15 hours. This period also features a relative decline in rainfall with drops as low as 1.57" (40mm), forming perfect conditions for outdoor activities, sightseeing, and overall exploration of the city.The worst time to visit Washington
Transversely, the period encompassing late fall into the heart of winter appears to be the least favorable for tourism. In these months, spanning from November through March, temperatures can dip down to a chilly 20.8°F (-6.2°C) in February, and maximum average temperatures not exceeding 48.6°F (9.2°C). Additionally, the daylight hours dramatically decrease ranging from 9.7 to 12 hours, limiting the time for outdoor sightseeing. The presence of snow in some of these months, with snowfall reaching 1.26" (32mm) in February, might be a deterrent for some visitors.Spring weather in Washington
Springtime in Washington ushers in a mild and moderately wet climate. Running from March to May, the temperatures show a rising trend from an average low of 31.5°F (-0.3°C) in March to an inviting high of 72.1°F (22.3°C) in May. Rainfall during this period stays above 1 inch with the number of rainy days peaking at 17.2 days in May. Notably, March records an admirable average of 12 hours of daylight, progressing to a generous 14.4 hours by May.Summer weather in Washington
Summer in Washington is decidedly warm with average minimum and maximum temperatures varying between 57.7°F (14.3°C) and 83.3°F (28.5°C). This time from June to August experiences less overall rainfall than the preceding months, with amounts dwindling down to 1.57" (40mm) in June and August. The longest days of the year occur in summer, offering as much as 15 hours of daylight in June and July.Autumn weather in Washington
The transition to Autumn from September to November brings about decreasing temperatures and daylight hours. The temperatures shift from an average high of 75.7°F (24.3°C) in September to a cooler average high of 49.5°F (9.7°C) in November. Concurrently, daylight hours recede from 12.4 hours in September to just 10 hours in November. Rainfall in this period remain relatively low, hovering around 1 inch per month.Winter weather in Washington
Winter in Washington records the lowest temperatures and shortest days. In the period from December to February, average temperatures hover between a chill of 20.8°F (-6.2°C) and a high of 38.3°F (3.5°C). Noticeably, the daylight hours drop to 9.4 hours in December and January. Snowfall characteristic of this season reaches 1.06" (27mm) in December while rainfall remains fairly constant near 1 inch monthly.Weather in January
January in Washington, Pennsylvania, brings with it a chilly embrace, as the winter season shows its true form. The low temperatures, which can drop to 20.8°F (-6.2°C), are complemented by an influx of snow, peaking at 1.06" (27mm). Weather in January »Weather in February
Winds blow a little less brisk in February but the temperatures do not rise much either. Even though the highest temperature can go up to 38.3°F (3.5°C), that is still considered relatively low. The prevalence of snowfall continues to fade, resulting in a modest decrease in precipitation amounts. Weather in February »Weather in March
The first month of the spring, March, is a chilly month in Washington, Pennsylvania, with temperature in the range of an average low of 31.5°F (-0.3°C) and an average high of 48.6°F (9.2°C). The shift into March is characterized by a rise in the average high-temperature, transitioning from February's icy 38.3°F (3.5°C) to a frosty 48.6°F (9.2°C). Weather in March »Weather in April
April serenades Washington with the full arrival of spring. Despite the disappearance of the winter ice with only 0.12" (3mm) of snow recorded, some might find the rainfall of 1.57" (40mm) accompanying the increased humidity a bit overwhelming. Weather in April »Weather in May
May takes a leap forward into the warmer season, shaking off the remnants of the springtime dampness. Despite showing a mere difference of 0.04" (1mm) of rain from April, the most significant change is the near absence of snowfall. Weather in May »Weather in June
As June rolls in, Washington experiences full-blown summer with temperatures that reach to 78.8°F (26°C). The city brightens under the summer sun, which shines the longest in a year at 15 daylight hours. Citizens swap their raincoats for sun hats, and the green landscapes boom alongside the clear blue skies. Weather in June »Weather in July
July is the peak summer month in Washington, with temperatures escalating to a maximum of 83.3°F (28.5°C). Despite the fact that this is the warmest period across the year with the highest UV index, the likelihood of rainfall also increases to show 1.65" (42mm). Weather in July »Weather in August
August shares July's fervor but with a somewhat cooler ambience. Despite a slight decline in temperature levels, a maximum of 82°F (27.8°C) can still be reached, symbolizing the sun's persistent grip. Unlike the previous month, precipitation experiences a decrease to 1.26" (32mm), reinforcing the dominance of dry, hot weather. Weather in August »Weather in September
September introduces the beginning of the fall season in Washington, with temperatures cooling down to a maximum of 75.7°F (24.3°C). Weather patterns present a decline in both rainfall and daylight hours, indicating the year's transition into its more temperate phase. Weather in September »Weather in October
Falling firmly in the territory of autumn, October in Washington presents noteworthy changes in weather conditions. Mild temperatures prevail, confirmed by the mercury, which drops to a maximum of 62.4°F (16.9°C). The city experiences a beautiful transformation as the landscape dons shades of red, orange, and yellow. Weather in October »Weather in November
November brings a significant chill to the air in Washington as the city teeters on the edge of the winter season. Temperatures hardly touching 49.5°F (9.7°C), the city bears the characteristic bite of the oncoming cold. With a cool wind brewing and the reintroduction of snowfall trends, Washington's weather morphs, preparing the city's canvas for winter's artwork. Weather in November »Weather in December
December announces the return of winter in Washington, with average temperatures dropping to a wintery 40.1°F (4.5°C). Amid the festive cheer, the weather gets frostier, with the reappearance of substantial snowfall at 0.83" (21mm). Weather in December »Updated: Aug 28, 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
With average high and low temperatures of 33.6°F (0.9°C) and 20.8°F (-6.2°C) respectively, January is Washington's coldest month.
The months with the least rainfall are January and November Rain falls for 7.5 days and accumulates 0.94" (24mm) of rain.
In Washington, during the entire year, the rain falls for 143 days and collects up to 14.8" (376mm) of precipitation.
Months with snowfall are January through May, October through December.
Throughout the year, there are 33.5 snowfall days, and 4.88" (124mm) of snow is accumulated.
The month with the least sunshine is January, with an average of 3h of sunshine.
With an average relative humidity of 85%, February is the most humid month.
The month with the most snowfall is February, when snow falls for 8.1 days and typically aggregates up to 1.26" (32mm) of snow.
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.
The months with the lowest humidity are April, July and August, with an average relative humidity of 77%.
June through September are months without snowfall.
June has the longest days of the year in Washington, with an average of 15h and 0min of daylight.
June through August, with an average maximum UV index of 6, are months with the highest UV index.
July is the month when Washington's temperatures reach their peak, with averages of 83.3°F (28.5°C) and lows of 61.9°F (16.6°C).
July is the month with the most rainfall. Rain falls for 15.8 days and accumulates 1.65" (42mm) of precipitation.
August has the most sunshine of the year, with an average of 10.2h of sunshine.
The month with the shortest days is December, with an average of 9h and 24min of daylight.
December is the month with the lowest UV index, with an average maximum UV index of 1.
Average temperature
Washington, PA
The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (33.6°F).
The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is January (20.8°F).
Average pressure
Washington, PA
- Average pressure in January:
30.12"Hg - Average pressure in February:
30.08"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.97"Hg - Average pressure in May:
30"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:
30.05"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
Washington, PA
- Average wind speed in January:
7.8mph - Average wind speed in February:
7.6mph - Average wind speed in March:
7.1mph - Average wind speed in April:
7.3mph - Average wind speed in May:
6mph - Average wind speed in June:
5.5mph
- Average wind speed in July:
4.7mph - Average wind speed in August:
4.5mph - Average wind speed in September:
5mph - Average wind speed in October:
6mph - Average wind speed in November:
6.6mph - Average wind speed in December:
7.1mph
The windiest month (with the highest average wind speed) is January (7.8mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).
Average humidity
Washington, PA
The month with the highest relative humidity is February (85%).
The months with the lowest relative humidity are April, July and August (77%).
Average rainfall
Washington, PA
- Average rainfall in January:
0.94" - Average rainfall in February:
0.98" - Average rainfall in March:
1.1" - Average rainfall in April:
1.57" - Average rainfall in May:
1.61" - Average rainfall in June:
1.57"
- Average rainfall in July:
1.65" - Average rainfall in August:
1.26" - Average rainfall in September:
1.02" - Average rainfall in October:
1.06" - Average rainfall in November:
0.94" - Average rainfall in December:
1.06"
The wettest month (with the highest rainfall) is July (1.65").
The driest months (with the least rainfall) are January and November (0.94").
Average rainfall days
Washington, PA
- Average rainfall days in January:
7.5 days - Average rainfall days in February:
7.3 days - Average rainfall days in March:
11.1 days - Average rainfall days in April:
13.7 days - Average rainfall days in May:
17.2 days - Average rainfall days in June:
15.3 days
- Average rainfall days in July:
15.8 days - Average rainfall days in August:
14.8 days - Average rainfall days in September:
11.7 days - Average rainfall days in October:
11.1 days - Average rainfall days in November:
8.1 days - Average rainfall days in December:
9.4 days
The month with the highest number of rainy days is May (17.2 days).
The month with the least rainy days is February (7.3 days).
Average snowfall
Washington, PA
- Average snowfall in January:
1.06" - Average snowfall in February:
1.26" - Average snowfall in March:
0.94" - Average snowfall in April:
0.12" - Average snowfall in May:
0.04" - Average snowfall in June:
0"
The month with the highest snowfall is February (1.26").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Washington, PA
- Average snowfall days in January:
9.8 days - Average snowfall days in February:
8.1 days - Average snowfall days in March:
4.8 days - Average snowfall days in April:
1.3 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:
0.3 days - Average snowfall days in November:
2.5 days - Average snowfall days in December:
6.5 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
Washington, 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:
3h and 0min - Average sunshine in February:
3h and 48min - Average sunshine in March:
5h and 30min - Average sunshine in April:
7h and 48min - Average sunshine in May:
8h and 48min - Average sunshine in June:
9h and 30min
- Average sunshine in July:
10h and 0min - Average sunshine in August:
10h and 12min - Average sunshine in September:
8h and 30min - Average sunshine in October:
5h and 24min - Average sunshine in November:
5h and 0min - Average sunshine in December:
3h and 30min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
Average sunshine days
Washington, PA
- Average sunshine days in January:
17.1 days - Average sunshine days in February:
15.6 days - Average sunshine days in March:
15.6 days - Average sunshine days in April:
14.4 days - Average sunshine days in May:
11.8 days - Average sunshine days in June:
13.1 days
- Average sunshine days in July:
12.8 days - Average sunshine days in August:
13.9 days - Average sunshine days in September:
15.9 days - Average sunshine days in October:
18.5 days - Average sunshine days in November:
19.1 days - Average sunshine days in December:
17.5 days
The month with the most sunshine days is November (19.1 days).
The month with the least sunshine days is May (11.8 days).
Average UV index
Washington, PA
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
Washington, PA
The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility
Washington, PA
The months with the highest visibility are April and November (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October and December (5mi).
