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The coastal region of Maryland is known for its stifling heat and humidity, but the area of Frederick County actually tends to be a bit cooler than that of Eastern Maryland around Baltimore, or other nearby cities. The county does still have four distinct seasons, and that means HOT summers, warm and pleasant spring and fall, and cool and sometimes downright cold winters.
As with the rest of Maryland, the air can feel particularly sticky in the summer months when things can heat up and the humid rises. Average temperatures are in the 80s, but with the usual summer heat waves you can expect highs in the upper 80s to low 90s and even much higher for brief spells. Unlike other parts of Eastern Maryland it does cool down quickly after the sun goes down too. And evening temperatures can drop to the high 60s or low 70s. Summers are hot, and July and August are typically the warmest months.
With the arrival of September and October there is a cooling trend and this coincides with the area’s wet season, with the most rain falling in September. It dries out as fall turns to winter, but the temperatures drop too. By December it will start to really feel like winter with daytime temperatures only in the 40s. It can freeze in Frederick County, and snow is not all that uncommon in January and February (with the occasional white Christmas too). With the return of spring the weather warms up fast, and by March the area features generally mild weather in Frederick.