Yes

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

Why? Because the cold's there, but it's just a reminder, not an invasion!
45°F7°C & Clear

Wind is 2 mph3 km/h from the East, gusting to 3 mph5 km/h
June 1
6am44°F7°C3 mph5 km/h EastClear
7am45°F7°C3 mph5 km/h SoutheastClear
8am48°F9°C2 mph4 km/h SoutheastClear
9am53°F12°C1 mph1 km/h SouthClear
10am58°F14°C3 mph5 km/h WestClear
11am62°F17°C4 mph6 km/h NorthwestClear
12pm66°F19°C5 mph8 km/h NorthwestClear
1pm70°F21°C4 mph7 km/h NorthwestClear
2pm72°F22°C5 mph9 km/h NorthwestClear
3pm74°F23°C6 mph9 km/h NorthClear
4pm74°F24°C5 mph9 km/h NorthClear
5pm75°F24°C5 mph8 km/h NorthMostly Clear
DateLowHighWindDayNight
June 144°F7°C75°F24°C4 mph7 km/h from NorthwestClearClear
June 252°F11°C84°F29°C10 mph16 km/h from SouthMostly ClearPartly Cloudy
June 366°F19°C79°F26°C18 mph29 km/h from SouthwestRainRain
June 456°F13°C70°F21°C9 mph14 km/h from NortheastRainRain
June 554°F12°C73°F23°C9 mph15 km/h from NortheastDrizzlePartly Cloudy
June 655°F13°C78°F25°C6 mph10 km/h from NortheastMostly ClearMostly Cloudy
June 755°F13°C77°F25°C4 mph7 km/h from NortheastPartly CloudyPartly Cloudy

Yes

Low of 52°F11°C, High of 84°F29°C
Wind: 10 mph16 km/h
Precipitation: None

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