Yes

you do need a jacket based on the weather in Montgomery, IL, USA 1 second ago

Why? Because it's cool. Pleasantly cool, but cool!
58°F14°C & Cloudy

Wind is 10 mph16 km/h from the East, gusting to 19 mph30 km/h
May 24
10pm57°F14°C10 mph15 km/h EastCloudy
11pm55°F13°C9 mph14 km/h EastCloudy
May 25
12am54°F12°C8 mph13 km/h EastCloudy
1am53°F12°C7 mph12 km/h EastCloudy
2am52°F11°C5 mph9 km/h EastCloudy
3am52°F11°C6 mph9 km/h EastCloudy
4am51°F11°C6 mph10 km/h EastCloudy
5am51°F10°C6 mph9 km/h EastCloudy
6am50°F10°C5 mph8 km/h EastDrizzle
7am51°F10°C4 mph6 km/h EastDrizzle
8am51°F11°C4 mph7 km/h EastCloudy
9am52°F11°C4 mph7 km/h EastCloudy
DateLowHighWindDayNight
May 2443°F6°C69°F21°C3 mph4 km/h from EastPartly CloudyCloudy
May 2548°F9°C67°F19°C7 mph11 km/h from EastMostly CloudyMostly Clear
May 2644°F7°C68°F20°C10 mph15 km/h from EastPartly CloudyMostly Cloudy
May 2751°F11°C65°F18°C11 mph18 km/h from NortheastRainRain
May 2854°F12°C64°F18°C13 mph20 km/h from WestRainPartly Cloudy
May 2952°F11°C70°F21°C9 mph15 km/h from NorthwestPartly CloudyPartly Cloudy
May 3055°F13°C70°F21°C9 mph14 km/h from NorthwestPartly CloudyPartly Cloudy

Yes

Low of 48°F9°C, High of 67°F20°C
Wind: 7 mph11 km/h
Precipitation: 24% rain

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