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Delaware, OH

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The climate of Delaware

Delaware, Ohio, resting in the heartland of the United States, is typified by a Humid Continental climate (Dfa according to the Köppen classification). This specific classification is characterized by a distinct seasonality with warm to hot, often humid summers, and cold, usually snow-packed winters. On a 12-month rotation, the landscape in Delaware bustlingly transforms, displaying the diversity of its weather.

The temperature's annual swing in Delaware ripples from 20.3°F (-6.5°C) in January, peaking at 81.1°F (27.3°C) in July. This considerable fluctuation illustrates the differing climate stages over the year. Precipitation is evenly distributed throughout the year, accumulating to an annual average of around 30.3" (770mm). The city experiences more rainfall in May, receiving 3.82" (97mm), whilst the driest month is September with 1.93" (49mm) of rainfall.

Plentiful rainfall characterizes Delaware's climate, with the rain falling more frequently in the warmer months, from April to August. Humidity remains relatively stable throughout the year above the 75% mark, leading to a damp and sometimes clammy environment. It peaks to 84% in January. Notably, snowfall is present from November through to March but absent in the warmer months.

Delaware experiences ample daylight hours, marking a difference from the longest day in June (approximately 15 daylight hours) to the shortest in December (approximately 9.4 daylight hours). Likewise, the sunshine hours are similarly distributed peaking to approximately 10.4 daylight hours in August. The climate of Delaware is termed windy, as wind speed mostly fluctuates between 5.7mph (9.2km/h) to 10mph (16.1km/h) annually.

The best time to visit Delaware

The greatest time to visit Delaware, Ohio, is between May and September. During these months, temperatures gravitate around the comfortable 70°F (21.1°C) to 80°F (26.7°C) range, with minimal to zero snowfall. The higher temperatures, combined with extended daylight hours (exceeding 13 hours from April to September) and heightened sunshine duration (over 9 hours from May to August), provide ideal conditions for outdoor activities.

June, synonymous with welcoming the summer, also celebrates the longest days and the maximum UV Index. This period sees only a slight increase in humidity and manages to balance it with ample rainfall ensuring a refreshing atmosphere alongside warm temperatures.

The worst time to visit Delaware

The coldest months, namely December to February, could be the least appealing for travelers to Delaware. During this time, the city bares frigid temperatures, with the lower limit drooping to 20.3°F (-6.5°C). Coupled with regular snowfall up to 3.46" (88mm) in December, it may not be as conducive to outdoor activities unless winter sports are the primary draw.

The limited daylight hours (less than 10), reduced sunlight (less than 5 hours), and heightened relative humidity also align these months as less than ideal for tourists.

Spring weather in Delaware

Spring in Delaware is a season of rejuvenation and increasing warmth. Starting from March, temperatures gradually rise from 32.5°F (0.3°C) to 59.9°F (15.5°C) in April and finally stepping into the warmth of 71.1°F (21.7°C) in May. Both daylight and sunshine hours extend admirably from 12 to 14.4 hours and 6.1 to 9.1 hours respectively.

Despite temperatures sometimes being on the cooler side in early spring, this period experiences increasing rainfall, transitioning from a more solid precipitation form during winter. This increased rainfall peaks at 3.82" (97mm) in May, making spring in Delaware a wet season.

Summer weather in Delaware

June, July, and August are the summer months in Delaware. During this period, there's a noticeable heat with temperatures soaring from 77.9°F (25.5°C) in June, reaching a peak of 81.1°F (27.3°C) in July and starting to decline to 79.3°F (26.3°C) in August. This period is also one of the driest, with rainfall diminishing to around 2.8" (71mm), leading to rather hot and dry conditions.

Despite this, humidity lingers in the high 70s to low 80s%, ensuring the environment maintains a certain amount of moisture. These months enjoy the most daylight, stretching up to a maximum of 15 hours in June, and basking in the greatest amount of sunshine, calculating in 10.4 hours daily in August.

Autumn weather in Delaware

Autumn in Delaware begins in September and continues through November. The season is characterized by a gradual cooldown of temperatures, moving from a pleasant 74.7°F (23.7°C) in September to a cooler 48.6°F (9.2°C) in November. Daylight and sunshine hours also drop significantly during this period, descending from 12.4 hours to 10 hours and from 8.2 hours to 5.3 hours, respectively.

During these months, there is a noticeable decline in precipitation, with rainfall settling at 1.93" (49mm) in September, then gradually rising again through October and November. Despite this reduction, humidity remains steadily around 75 to 78%, maintaining a relatively moist and comfortable atmosphere.

Winter weather in Delaware

Winter months in Delaware, spanning from December to February, are cold and snowy. Low temperatures can drop to 20.3°F (-6.5°C), while high temperatures barely reach 32°F (0°C) in January. During this season, precipitation is majorly frozen in nature with the city witnessing snowfall of 3.46" (88mm), 3.39" (86mm), and 2.13" (54mm) in December, January, and February respectively.

The least amount of daylight and sunshine hours in the year is recorded in this season; daylight reduces to just 9.4 hours while sun rays last only for approximately 4.1 hours. Concurrently, the humidity climbs up to 84%. Despite these conditions, winter in Delaware is not devoid of charm. The snowy landscape offers opportunities for winter sports and other cold-weather activities.

Weather in January

January in Delaware, Ohio, welcomes the new year with a chill, as winter continues to dictate the area's climate. The month carries the brunt of winter’s frigid grip, a stark contrast to the mild conditions of December. Despite consistent cloud cover, snowfall remains minimal with only 3.46" (88mm) throughout the month. Weather in January »

Weather in February

February ushers in a slight rise in temperature, hinting at the arrival of spring in Delaware. Compared to January, the weather seems less harsh, with the landscape starting to show signs of life. Snowfall reduces considerably to 3.39" (86mm), reflecting the month's milder conditions. Weather in February »

Weather in March

The weather in March symbolizes a shift from winter to spring in Delaware. The cold subsides noticeably, and there’s a conspicuous drop in snowfall by 2.13" (54mm), indicating the last vestige of winter. The increase in sunlight promotes the thawing process, ushering in the emergence of greenery. Weather in March »

Weather in April

April's arrival brings forth clear signs of spring in full force throughout Delaware. The city rejuvenates under the warmth of longer sunlight hours, a significant improvement from the short days of March. The month’s striking feature is the absence of snowfall, standing at a negligible 0.31" (8mm). Weather in April »

Weather in May

May brings full spring weather to Delaware, offering pleasant and bright days. Compared to April, the increase in temperature is noticeable, as the last of the spring chills fade away. The city witnesses no snowfall, marking a complete transition into milder conditions. Weather in May »

Weather in June

June in Delaware signifies the onset of summer with the temperature rising notably compared to May. Heat becomes a primary weather feature, and mood around the city embodies a typical summer spirit. Snowfall remains non-existent, allowing residents to indulge in a plethora of outdoor events. Weather in June »

Weather in July

Delaware peaks in its summer heat during July, marking the height of the season. Following June’s trend, the temperature and humidity continue to escalate although the snowfall remains non-existent. Despite the soaring temperatures, the city bustles with summer activities and tourism. Weather in July »

Weather in August

August in Delaware brings a slight dip in temperature, providing the initial signs of summer’s departure. Despite being in the final phase of summer, the city continues to enjoy warm weather and outdoor extravaganzas. The absence of snowfall maintains a summer-like atmosphere, carrying on from July. Weather in August »

Weather in September

September escorts autumn into Delaware, bringing a noticeable drop in temperature when compared to August. The city starts to morph into its fall demeanor, blending warm days with cool nights. Snowfall remains absent, maximum wind speed stands at 6.6mph (10.6km/h), allowing the residents to savor the outdoors. Weather in September »

Weather in October

October ushers in colder days in Delaware, and the colors of autumn become more outstanding, as compared to September. The city embraces the fall weather, as temperatures fall consistently. A mild dusting of 0.12" (3mm) snow heralds the coming winter, hinting at possible snowfall. Weather in October »

Weather in November

November in Delaware signifies the beginning of winter. The decline in temperature from October is significant, and the chill in the air becomes more pronounced. The city receives it's first noteworthy snowfall to about 1.3" (33mm), officially marking the start of winter. Weather in November »

Weather in December

December rings in the winter proper in Delaware, with sharp contrast to the relatively mild November weather. As the coldest month of the year, it wraps the city in a blanket of chill. Snowfall sees an increase, measuring 2.87" (73mm), and adding to the festive spirit. Weather in December »
Updated: Feb 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What part of the year is the coldest in Delaware?

January is the coldest month, with the temperature often reaching an average high of 32°F (0°C) and an average low of 20.3°F (-6.5°C).

What is the most humid month in Delaware?

With an average relative humidity of 84%, January is the most humid month.

How much does it rain in Delaware?

In Delaware, during the entire year, the rain falls for 172.1 days and collects up to 32.01" (813mm) of precipitation.

When does it snow in Delaware?

January through April, October through December are months with snowfall in Delaware.

When does it snow the most in Delaware?

The month with the most snowfall in Delaware, Ohio, is January, when snow falls for 13.8 days and typically aggregates up to 3.46" (88mm) of snow.

How many days does it snow in Delaware?

Throughout the year, there are 46.8 snowfall days, and 13.58" (345mm) of snow is accumulated.

What is the month with the least sunshine in Delaware?

The month with the least sunshine is January, with an average of 3.5h of sunshine.

What is the month with the lowest UV index in Delaware?

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

When is Daylight Saving Time (DST) in Delaware?

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 wettest month in Delaware?

May is the month with the most rainfall. Rain falls for 18.7 days and accumulates 3.82" (97mm) of precipitation.

When it does not snow in Delaware?

May through September are months without snowfall in Delaware.

When are the longest days in Delaware?

With an average of 15h and 0min of daylight, June has the longest days of the year in Delaware, Ohio.

When is the highest UV index in Delaware?

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

What is the hottest time of year in Delaware?

July is the month when Delaware, Ohio, sees the average highest temperatures, with a high of 81.1°F (27.3°C) and a low of 63.9°F (17.7°C).

What month has the most sunshine in Delaware?

With an average of 10.4h of sunshine, August has the most sunshine of the year.

What is the driest month in Delaware?

September is the month with the least rainfall. Rain falls for 14.7 days and accumulates 1.93" (49mm) of precipitation.

What is the least humid month in Delaware?

October and November, with an average relative humidity of 75%, are the least humid months in Delaware, Ohio.

What is the month with the shortest days in Delaware?

With an average of 9h and 24min of daylight, December has the shortest days of the year in Delaware.
Today
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Long-term
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Average temperature
Delaware, OH

Average temperature - Delaware, OH

The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (32°F).

The month with the highest average low temperature is July (63.9°F).
The coldest month (with the lowest average low temperature) is January (20.3°F).

Average pressure
Delaware, OH

Average pressure - Delaware, OH

The months with the highest atmospheric pressure are January and November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed
Delaware, OH

Average wind speed - Delaware, OH

The windiest month (with the highest average wind speed) is January (10mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).

Average humidity
Delaware, OH

Average humidity - Delaware, OH

The month with the highest relative humidity is January (84%).
The months with the lowest relative humidity are October and November (75%).

Average rainfall
Delaware, OH

Average rainfall - Delaware, OH

The wettest month (with the highest rainfall) is May (3.82").
The driest month (with the least rainfall) is September (1.93").

Average rainfall days
Delaware, OH

Average rainfall days - Delaware, OH

The month with the highest number of rainy days is May (18.7 days).
The month with the least rainy days is February (10 days).

Average snowfall
Delaware, OH

Average snowfall - Delaware, OH

The month with the highest snowfall is January (3.46").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days
Delaware, OH

Average snowfall days - Delaware, OH

The month with the highest number of snowfall days is January (13.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight / Average sunshine
Delaware, OH

Average daylight / Average sunshine - Delaware, OH

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).

The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).

Average sunshine days
Delaware, OH

Average sunshine days - Delaware, OH

The month with the most sunshine days is November (16.1 days).
The month with the least sunshine days is February (9.1 days).

Average UV index
Delaware, OH

Average UV index - Delaware, OH

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, November and December (UV index 2).

Average cloud cover
Delaware, OH

Average cloud cover - Delaware, OH

The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 30).

Average visibility
Delaware, OH

Average visibility - Delaware, OH

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

Delaware, Ohio, USA

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