New Castle (PA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit New Castle.
Climate overview of New Castle
New Castle, Pennsylvania, United States of America, sees big temperature differences between seasons, with July peaking at 29°C (84°F) and January dropping to 2°C (36°F).
The city receives considerable rain/snowfall, with around 1075 mm (42 in) annually. June is the wettest month. It has warm summers and very cold winters. Sunshine peaks in July, when the city sees around 8.5 hours of sunshine per day.
New Castle Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in New Castle - and find the best time to visit.
Monthly Temperature in New Castle
Visitors to New Castle can expect significant temperature changes throughout the year. Typically, average maximum daytime temperatures range from a comfortable 29°C (84°F) in July to a very cold 2°C (36°F) in the coolest month, January.
Nights vary from 16°C (61°F) in July to around -9°C (16°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in New Castle
New Castle is known for its substantial rain/snowfall, with annual precipitation reaching 1075 mm (42 in). New Castle offers a pleasant mix of wetter and slightly drier months. The difference in precipitation between the wettest month June (122 mm (4.8 in)) and the driest month November (62 mm (2.4 in)) is not too significant. For more details, please visit our New Castle Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in New Castle
For those who appreciate different seasons, New Castle serves as an ideal destination. Expect longer, more sun-filled days in July with an average of 8.5 hours of sunshine daily, and embrace the darker days in December, offering only 2.4 hours of daily sunlight.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Humidity in New Castle by Month
The relative humidity is high throughout the year in New Castle.
The city experiences its highest humidity in September, reaching 72%. In April, the humidity drops to its lowest level at 59%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit New Castle
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: May and September
- Warmest weather: July and August
- Most sunshine: June and July
- Seasonal pattern: Warm summers and very cold winters
- Coldest conditions: January, with freezing nights around -9°C (16°F).
Frequently asked questions about the climate in New Castle
What is the best time to visit New Castle?
May and September typically offer the most optimal weather in New Castle. In contrast, January, February, March and December tend to have less optimal conditions. New Castle has warm summers and very cold winters.
What temperatures can I expect in New Castle?
Daytime highs range from 2°C (36°F) in January to 29°C (84°F) in July. Nighttime lows range from -9°C (16°F) to 16°C (61°F). Temperatures vary considerably through the year.
How much rain does New Castle get?
Annual rainfall is around 1075 mm (42 in). June is the wettest month with 122 mm (4.8 in), while November is the driest with 62 mm (2.4 in).
How sunny is New Castle?
New Castle receives around 2,029 hours of sunshine per year. July is the sunniest month with 255 hours, while December is the cloudiest with just 73 hours. Overall, New Castle enjoys abundant sunshine.
New Castle 3-Day Forecast
New Castle (PA) 3-Day Forecast
New Castle on the map
New Castle is highlighted - select any city to see its climate.
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