Yes

you do need a jacket based on the weather in Frederick, MD, USA 1 second ago

Why? Because just cool enough for a jacket, but not warm enough to ditch it!
56°F13°C & Clear

Wind is 5 mph8 km/h from the Southeast, gusting to 13 mph21 km/h
October 10
11am56°F14°C5 mph9 km/h SoutheastClear
12pm60°F15°C8 mph13 km/h SoutheastMostly Clear
1pm62°F17°C8 mph13 km/h SoutheastMostly Clear
2pm63°F17°C8 mph13 km/h SoutheastMostly Clear
3pm64°F18°C8 mph13 km/h SoutheastMostly Clear
4pm64°F18°C9 mph14 km/h SoutheastMostly Clear
5pm63°F17°C8 mph14 km/h SoutheastPartly Cloudy
6pm61°F16°C7 mph12 km/h SoutheastPartly Cloudy
7pm57°F14°C6 mph9 km/h SoutheastPartly Cloudy
8pm55°F13°C5 mph9 km/h SoutheastPartly Cloudy
9pm54°F12°C5 mph8 km/h SoutheastPartly Cloudy
10pm53°F12°C4 mph7 km/h SoutheastPartly Cloudy
DateLowHighWindDayNight
October 1040°F4°C64°F18°C6 mph10 km/h from SoutheastMostly ClearPartly Cloudy
October 1146°F8°C68°F20°C5 mph8 km/h from EastMostly CloudyDrizzle
October 1257°F14°C65°F18°C12 mph20 km/h from NortheastDrizzleDrizzle
October 1354°F12°C63°F17°C12 mph19 km/h from NorthDrizzleDrizzle
October 1455°F13°C67°F20°C11 mph18 km/h from NorthPartly CloudyPartly Cloudy
October 1552°F11°C69°F20°C9 mph14 km/h from NorthwestMostly ClearPartly Cloudy
October 1647°F8°C61°F16°C11 mph17 km/h from NorthwestMostly ClearMostly Clear

Yes

Low of 46°F8°C, High of 68°F20°C
Wind: 5 mph8 km/h
Precipitation: 21% rain

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