Climate and monthly weather forecast
Plainfield, NJ

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The climate of Plainfield

Located in New Jersey, USA, the city of Plainfield experiences a climate classified by the Köppen Climate Classification as Cfa, otherwise known as a Humid subtropical, with no dry season. This inference is drawn from patterns observed in monthly climatological parameters, which reveal a warm, humid year-round climate, each season distinctively characterized.

Temperature fluctuations in Plainfield are fairly predictable across the year. The lowest average monthly temperature rests at 23.9°F (-4.5°C) registered in January, while July records a high reaching the peak at 84.2°F (29°C). Relative humidity tends towards the higher end, maintaining a narrow band from 73% to 78% throughout the twelve months.

Rainfall, averaging from 1.69" (43mm) to 3.19" (81mm) a month, is fairly evenly distributed throughout the year, with July marking the year's peak rainfall of 3.03" (77mm). Moreover, snowfall events dot the colder months, averaging 2.09" (53mm) in December, peaking in March at 3.23" (82mm), and then tapering off to negligible amounts by May.

While sunlight hours fluctuate from a low of 9.7 hours in January to a high of 15 hours in June, the average number of sunshine days surprisingly do not follow this trend closely. An exceptional condition observed in Plainfield is the couple of months with maximum wind gusts. Notwithstanding, December and January come with their gusts averaging at 12.7mph (20.4km/h) and 12.2mph (19.6km/h) respectively, above the year-round norm.

The best time to visit Plainfield

Judging by Plainfield's climatological parameters, the most desirable time to visit would arguably be between May to July. During this period, temperatures range comfortably from 69.3°F (20.7°C) to 84.2°F (29°C), conducive for outdoor exploration. Despite July being the rainiest month at 3.03" (77mm), it also presents mid-range relative humidity levels around 74%, keeping the conditions comfortably humid.

Additionally, the aforementioned span allows vacationers to enjoy extended daylight that extends from 14.5 hours to 15 hours. Basking under a generous amount of sunshine, ranging from 8.6 hours to 10.5 hours, further enhances the enjoyable outdoor experience in the city.

The worst time to visit Plainfield

Visitations to Plainfield during the winter months of December to February might prove less pleasurable due to the prevalent cold conditions. Average temperatures drop significantly during these months, plummeting to lows from 23.9°F (-4.5°C) to 25.7°F (-3.5°C).

While snowfall averages between 2.09" (53mm) and 2.87" (73mm) during these months, making for a picturesque landscape, outdoor activities might be hampered as daylight hours dip to between 9.3 and 10.7 hours. The wind speeds also peak during December and January, both averaging wind gusts above 12mph (19.3km/h), which can add an extra chill to the air.

Spring weather in Plainfield

Spring in Plainfield, encompassing March to May, displays a clear trend of warming temperatures, from a mild 47.3°F (8.5°C) in March to a comfortable 69.3°F (20.7°C) by May. Correspondingly, the instances of snowfall decrease after March, eventually amounting to virtually no snow in May.

Spring rain is fairly frequent, with rainfall averaging from 2.36" (60mm) to 2.8" (71mm), the highest average number of rainy days tallied in May, at 16.3 days. However, this period also brings an increased amount of daylight from 12 hours in March to 14.5 hours in May, providing ample light for day-long activities.

Summer weather in Plainfield

Heat and humidity define the summer months from June through August in Plainfield. During this period, temperatures stay comfortably warm, ranging from 75.4°F (24.1°C) to 84.2°F (29°C), dictated by the highest recorded average humidities oscillating from 74% to 77%.

Although rainfall inches up between 2.4" (61mm) and 3.03" (77mm), so do the daylight hours, reaching up to 15 hours. Thus, visitors to Plainfield during this time can enjoy extended, albeit humid days, and partake in small rain showers.

Autumn weather in Plainfield

Autumn in Plainfield ushers in a gradual but noticeable decline in the temperatures, dipping from 75.4°F (24.1°C) in September to a cooler 51.1°F (10.6°C) by November. Precipitation during this period fluctuates between 1.69" (43mm) to 2.83" (72mm), marking a slight decrease from the wetter summer months.

Daylight hours also contract, shrinking from 12.5 hours in September to 9.9 hours in November. Despite these transitions, the number of sunny days generally stay consistent, enabling both residents and visitors to enjoy the fall foliage in comfortable weather.

Winter weather in Plainfield

Plainfield’s winter season, spanning from December to February, registers a distinct drop in the temperatures with lows dipping from 31.1°F (-0.5°C) in February to 23.9°F (-4.5°C) in January. Snowfall events are primarily confined to these colder months, averaging between 1.46" (37mm) to 2.87" (73mm).

Daylight hours reach their annual minimum during these months, spanning from 9.3 hours in December to the year's shortest day-length at 9.7 hours in January. Therefore, despite the increased cloud presence, the city's winter season lends itself to a peaceful, quiet atmosphere, ideal for cozy indoor activities.

Weather in January

Starting off with January, Plainfield, New Jersey experiences a notable drop in temperature with a high of 36°F (2.2°C) and a low of 23.9°F (-4.5°C) being observed. While the temperatures suggest a chill in the air, it's also the time of the year when relative humidity peaks at 75%, making the cold quite unforgiving. Weather in January »

Weather in February

February does not provide much relief from the cold snap, with temperatures still lingering around the chilly range, albeit slightly higher compared to January. The snowfall increases to a total of 2.87" (73mm), making it one of the snowiest periods of the year. Weather in February »

Weather in March

With the arrival of March, there are signs of a weather shift as spring approaches Plainfield. The temperatures experience a significant rise, with the highest reaching 47.3°F (8.5°C) and the lowest at 32.9°F (0.5°C). This is also when the area receives the highest daylight hours, a significant jump from the previous months. Weather in March »

Weather in April

April witnesses a continued upward trend in temperatures, making it a considerably warmer month compared to the first quarter of the year. A noteworthy fact about April is the precipitation levels reaching 2.36" (60mm), making it a wet month. Weather in April »

Weather in May

May ushers in the peak of spring, with temperatures remaining steady from 69.3°F (20.7°C) to 52.9°F (11.6°C). An interesting highlight is at this time weather experiences the peak in rainfall activity, which measures at about 2.8" (71mm). Weather in May »

Weather in June

June marks the onset of summer, with temperatures rising significantly up to 77.5°F (25.3°C). An interesting feature of June is that the city experiences the highest sunshine hours, averaging 9.7 hours a day, making it the sunniest month of the year. Weather in June »

Weather in July

July is typically the hottest month in Plainfield, with temperatures shooting up to 84.2°F (29°C). It is also a month of contrast, providing maximum daylight of up to 14.7 hours while also having the most number of rain days, at approximately 16.5 days. Weather in July »

Weather in August

August sees a slight dip in temperatures, with the high settling at 82°F (27.8°C). Although a slight moderation from July, it still remains comfortably warm. An interesting weather phenomenon for August is the equal periods of maximum sunlight and heavy rain. Weather in August »

Weather in September

September brings with it a significant shift in Plainfield’s weather. With temperatures declining to a high of 75.4°F (24.1°C) and a comfortable low of 59.4°F (15.2°C), it presents a marked coolness from the previous months' heat. Weather in September »

Weather in October

October sees a further decrease in temperature, with the highs dipping to 63.1°F (17.3°C), indicating a steady progression into autumn. An unusual feature is the rise in rainfall during October, with total precipitation reaching 2.83" (72mm). Weather in October »

Weather in November

November is a definitively cooler month with a maximum temperature of 51.1°F (10.6°C) and a minimum of 38.1°F (3.4°C). Strikingly, November is one of the months with least rainfall, the total precipitation falling to 2.36" (60mm). Weather in November »

Weather in December

As the final month of the year, December experiences a significant drop in temperature, with a high of 42.3°F (5.7°C) and a chilling low of 31.1°F (-0.5°C). Notable is the return of snowfall in December, amounting to an average of 1.46" (37mm). Weather in December »
Updated: Jun 23, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the coldest month?

January is the month when Plainfield sees the average lowest temperatures, with a high of 36°F (2.2°C) and a low of 23.9°F (-4.5°C).

How much does it rain?

Throughout the year, there are 160.7 rainfall days, and 30.12" (765mm) of precipitation is accumulated.

When does it snow?

January through May, October through December are months with snowfall.

How many days does it snow?

In Plainfield, during the entire year, snow falls for 25.4 days and aggregates up to 10.31" (262mm) of snow.

What is the month with the lowest UV index?

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Plainfield, New Jersey.

What are the most humid months?

The months with the highest humidity are February, October and December, with an average relative humidity of 78%.

What is the month with the least sunshine?

The month with the least sunshine is February, with an average of 4.6h of sunshine.

What is the snowiest month?

March is the month with the most snowfall. Snow falls for 5 days and accumulates 3.23" (82mm) of snow.

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?

The months with the lowest humidity are April and August, with an average relative humidity of 73%.

When it does not snow?

In Plainfield, snow does not fall in June through September.

When are the longest days?

June has the longest days of the year, with an average of 15h and 0min of daylight.

What is the month with the highest UV index?

The months with the highest UV index are June through August, with an average maximum UV index of 6.

What are the warmest months?

During the warmest month in Plainfield, July, temperatures average a high of 84.2°F (29°C) and a low of 67.5°F (19.7°C).

What month has the most sunshine?

With an average of 10.5h of sunshine, July has the most sunshine of the year in Plainfield.

What is the driest month?

September is the month with the least rainfall. Rain falls for 12.9 days and accumulates 1.69" (43mm) of precipitation.

What is the rainiest month?

December is the month with the most rainfall. Rain falls for 11.5 days and accumulates 3.19" (81mm) of precipitation.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 18min of daylight.
Today
Tomorrow
Long-term
YearJFMAMJJASOND

Average temperature
Plainfield, NJ

Average temperature - Plainfield, NJ

The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (36°F).

The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (23.9°F).

Average pressure
Plainfield, NJ

Average pressure - Plainfield, NJ

The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed
Plainfield, NJ

Average wind speed - Plainfield, NJ

The windiest month (with the highest average wind speed) is March (8.9mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).

Average humidity
Plainfield, NJ

Average humidity - Plainfield, NJ

The months with the highest relative humidity are February, October and December (78%).
The months with the lowest relative humidity are April and August (73%).

Average rainfall
Plainfield, NJ

Average rainfall - Plainfield, NJ

The wettest month (with the highest rainfall) is December (3.19").
The driest month (with the least rainfall) is September (1.69").

Average rainfall days
Plainfield, NJ

Average rainfall days - Plainfield, NJ

The month with the highest number of rainy days is July (16.5 days).
The month with the least rainy days is January (9.5 days).

Average snowfall
Plainfield, NJ

Average snowfall - Plainfield, NJ

The month with the highest snowfall is March (3.23").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days
Plainfield, NJ

Average snowfall days - Plainfield, NJ

The months with the highest number of snowfall days are January and February (7.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight / Average sunshine
Plainfield, NJ

Average daylight / Average sunshine - Plainfield, NJ

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 18min).

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

Average sunshine days
Plainfield, NJ

Average sunshine days - Plainfield, NJ

The month with the most sunshine days is November (18.4 days).
The month with the least sunshine days is June (11.4 days).

Average UV index
Plainfield, NJ

Average UV index - Plainfield, NJ

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

Average cloud cover
Plainfield, NJ

Average cloud cover - Plainfield, NJ

The months with the most cloud cover are February, March and December (Cloud cover 48).
The months with the least cloud cover are July and August (Cloud cover 32).

Average visibility
Plainfield, NJ

Average visibility - Plainfield, NJ

The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).

Plainfield, New Jersey, USA

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