Yes

you do need a jacket based on the weather in Horsham, PA, USA 1 second ago

Why? Because you're not freezing, but you’ll definitely start complaining if it lasts much longer and the wind is harsh and biting!
40°F5°C & Mostly Clear

Wind is 10 mph16 km/h from the West, gusting to 24 mph39 km/h
February 28
9am42°F6°C11 mph18 km/h NorthwestClear
10am44°F7°C13 mph21 km/h NorthwestMostly Clear
11am46°F8°C12 mph19 km/h NorthwestMostly Clear
12pm47°F8°C12 mph19 km/h NorthwestMostly Clear
1pm48°F9°C12 mph19 km/h WestMostly Clear
2pm49°F9°C11 mph18 km/h WestMostly Clear
3pm49°F10°C11 mph18 km/h WestPartly Cloudy
4pm48°F9°C10 mph16 km/h WestMostly Cloudy
5pm47°F9°C8 mph13 km/h WestMostly Cloudy
6pm45°F7°C5 mph8 km/h SouthwestMostly Cloudy
7pm44°F6°C5 mph8 km/h SouthwestMostly Cloudy
8pm43°F6°C7 mph11 km/h SouthPartly Cloudy
DateLowHighWindDayNight
February 2835°F2°C49°F10°C10 mph16 km/h from WestPartly CloudyPartly Cloudy
March 124°F-5°C53°F12°C15 mph23 km/h from WestPartly CloudyClear
March 219°F-7°C34°F1°C10 mph16 km/h from NorthwestClearMostly Clear
March 319°F-7°C38°F3°C5 mph8 km/h from NorthwestClearMostly Clear
March 427°F-3°C49°F9°C8 mph14 km/h from SouthCloudyDrizzle
March 542°F6°C62°F17°C15 mph25 km/h from SouthRainRain
March 634°F1°C54°F12°C16 mph25 km/h from NorthwestWindyMostly Clear

Yes

Low of 24°F-5°C, High of 54°F12°C
Wind: 15 mph23 km/h
Precipitation: None

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