Last updated: January 18, 2025
Delaware experiences a Cfa climate classification, characterized by a humid subtropical environment. Temperatures in the region exhibit a significant range, with January lows plunging to a chilling -18°C (-1°F), while July can soar up to a sweltering 37°C (99°F). The state's average temperature rests at a mild 15°C (59°F), providing a diverse climate that fosters distinct seasonal changes and vibrant ecological systems throughout the year.
Delaware's temperature patterns reveal distinct seasonal shifts, characterized by cold winters and warm summers. In the winter months, January and February see minimum temperatures dropping as low as -18°C (-1°F) and -15°C (5°F), with average highs rarely exceeding 25°C (77°F). As spring approaches, temperatures gradually rise, with March presenting milder conditions and April ushering in more warmth, peaking at 32°C (90°F). By late spring and early summer, temperatures continue to climb, reaching an impressive average of 26°C (80°F) in July, the hottest month, with maxima soaring to 37°C (99°F). The transition into fall marks a cooling trend, as September starts with an average of 22°C (72°F), before descending into October's cooler readings, ultimately closing the year with chilly December temperatures averaging just 5°C (42°F). This progression highlights Delaware's dynamic climate, exhibiting a range of temperatures that support a rich tapestry of seasonal experiences.
Rehoboth Beach experiences a temperature range from a chilly minimum of -11°C (13°F) in January to a warm peak of 31°C (88°F) in July. For more details on monthly temperature in Rehoboth Beach. Similarly, Bethany Beach sees temperatures dipping to -12°C (11°F) in the coldest month of January and rising to a maximum of 32°C (90°F) in July, offering a slightly broader range. Explore more about monthly temperature in Bethany Beach.
Delaware experiences a relatively consistent distribution of precipitation throughout the year, with monthly averages varying from 65 mm (2.6 in) in January to a peak of 154 mm (6.1 in) in August. Winter months generally accumulate less rainfall, with January receiving the lowest total, while February and March see increases, averaging 102 mm (4.0 in) and 103 mm (4.1 in), respectively. Spring months, particularly May, contribute significantly to Delaware's annual precipitation, as May alone accounts for 129 mm (5.1 in) of rainfall, helping to nourish the region's blooming flora.
As summer approaches, precipitation peaks, with July and August bringing heavy rains of 142 mm (5.6 in) and 154 mm (6.1 in), occurring over an increasing number of rainy days, particularly in August, which sees about 15 days of precipitation. Fall entries bring a decline in both total rainfall and the number of rainy days, with October contributing 120 mm (4.7 in) across roughly 9 days. Overall, Delaware's precipitation patterns reflect a clear seasonal cycle, with peak rainfall during the late summer months and a reduction towards the end of the year.
In Delaware, sunshine duration exhibits a clear seasonal pattern, with hours of sunlight steadily increasing as winter transitions into spring and then into summer. Starting with a modest 154 hours in January, the amount of sunshine begins to climb through February's 182 hours and reaches 260 hours by March. This upward trend accelerates as spring advances into April (273 hours) and May (302 hours), culminating in the summer months. June kicks off the peak sunshine periods, boasting 337 hours, while July takes the crown with a remarkable 360 hours of sunlight, providing ample opportunity for outdoor activities and warmth.
As summer wanes into fall, there's a noticeable decline in sunshine hours, yet the months of August (328 hours) and September (284 hours) still enjoy substantial sunlight before heading into October with 246 hours. The transition into winter marks a further drop, with November and December seeing 228 hours and 188 hours, respectively. These trends highlight Delaware's vibrant seasonal characteristics, where residents can revel in the sunlight during the summer, while also experiencing the more muted light of winter, offering a full spectrum of climatic experiences throughout the year.
The UV Index in Delaware demonstrates a distinct seasonal variation, reflecting increased sun exposure from winter through summer. Beginning with a moderate UVI of 3 in January and December, the index rises steadily in February to 5 and continues climbing through the spring months. March sees a significant jump to 7, while April and May reach notable levels of 9 and 10, respectively. This peak symbolizes the higher sun intensity and increased risk of UV exposure as outdoor activities become more prevalent with the warmer weather.
During the summer months of June, July, and August, Delaware maintains a consistent UVI of 10, indicating a high risk for harm from unprotected sun exposure. Even as September rolls in, the index remains elevated at 8, gradually decreasing in the fall months, with October at 7 and November returning to 5. This seasonal trend underscores the importance of sun protection during the spring and summer, as well as the gradual decline in UV exposure as autumn approaches, reminding residents to stay vigilant and mindful year-round.
UV Risk Categories
In Delaware, daylight duration showcases a clear seasonal rhythm, beginning its cycle at 9 hours in January and December, reflecting the shorter days of winter. As the year progresses into February, daylight increases to 10 hours and continues to extend steadily through March with 11 hours. Notably, April and May experience a substantial boost in daylight hours, reaching 13 hours and 14 hours, respectively, providing longer periods of sunlight that encourage outdoor activities and springtime rejuvenation.
Entering the summer months, daylight duration stabilizes at 14 hours in both June and July, offering the longest days of the year. As summer transitions into fall, daylight begins to recede, dropping to 13 hours in August and gradually diminishing to 12 hours in September. By October, daylight hours decrease further to 11 hours, followed by a return to 10 hours in November. This cycle of daylight highlights the pronounced seasonal changes in Delaware, reminding residents of the varying sunlit hours throughout the year and their impact on daily life and activities.
Bethany Beach, located in the United States, experiences a moderate climate featuring distinct seasonal variations. Winters are relatively mild, with average temperatures around 4°C (40°F) in January, and precipitation peaks subtly at 114 mm (4.5 in) in February. As spring arrives, temperatures increase, averaging 12°C (53°F) in April, accompanied by gradually lengthening sunshine durations exceeding 287 hours. The summer months usher in warm temperatures, with averages reaching 25°C (78°F) in July, although precipitation remains consistent, particularly in July with 114 mm (4.5 in) of rainfall. Autumn brings cooler, pleasant weather, with October showcasing a notable peak in rainfall at 137 mm (5.4 in) and ample sunlight hours. For more detailed information, you can refer to the Bethany Beach climate.
Rehoboth Beach experiences a temperate climate, characterized by mild winters and warm summers. During the coldest months, January and February, temperatures range from -11°C to 16°C (13°F to 62°F), while July and August are warmest, with highs around 31°C (88°F). The region receives relatively consistent precipitation throughout the year, peaking in October at 146 mm (5.8 in). Sunshine hours gradually increase from 157 hours in January to a peak of 360 hours in July, providing ample daylight during the warmer months. For more detailed information on climate conditions, visit the Rehoboth Beach climate.
In conclusion, Delaware's climate, characterized by its seasonal variations in temperature, precipitation, sunshine duration, UV Index, and daylight hours, creates a dynamic environment that shapes the experiences of its residents throughout the year. From the brisk winters with limited sunlight and cooler temperatures to the long, sun-filled summer days marked by high UV exposure and ample rainfall, each season presents unique opportunities and challenges. Understanding these climatic patterns allows residents and visitors alike to appreciate the natural beauty of Delaware while making informed choices about outdoor activities, sun protection, and seasonal preparations. This comprehensive awareness fosters a deeper connection to the local environment and enriches the overall experience of living in or exploring this diverse state.