Yes

you do need a jacket based on the weather in Aspen, CO 81611, USA 1 second ago

Why? Because rain's coming down and it's quite chilly!
42°F6°C & Rain

Wind is 1 mph2 km/h from the West, gusting to 7 mph12 km/h
June 6
11pm41°F5°C2 mph4 km/h SouthwestDrizzle
June 7
12am40°F4°C4 mph7 km/h SouthwestMostly Clear
1am39°F4°C3 mph6 km/h SouthwestClear
2am38°F3°C3 mph4 km/h SouthwestClear
3am38°F3°C2 mph3 km/h SouthwestClear
4am37°F3°C2 mph4 km/h SouthClear
5am36°F2°C2 mph4 km/h SouthClear
6am36°F2°C2 mph4 km/h SouthClear
7am36°F2°C2 mph4 km/h SouthClear
8am36°F2°C2 mph4 km/h SouthClear
9am39°F4°C2 mph4 km/h SouthClear
10am44°F7°C2 mph3 km/h WestClear
DateLowHighWindDayNight
June 637°F3°C48°F9°C6 mph9 km/h from WestMostly CloudyRain
June 736°F2°C58°F15°C7 mph11 km/h from NorthwestMostly ClearClear
June 839°F4°C60°F15°C6 mph10 km/h from NorthwestPartly CloudyMostly Clear
June 941°F5°C60°F16°C6 mph10 km/h from NorthPartly CloudyMostly Clear
June 1039°F4°C63°F17°C4 mph6 km/h from NorthPartly CloudyPartly Cloudy
June 1141°F5°C60°F16°C5 mph7 km/h from WestPartly CloudyPartly Cloudy
June 1242°F5°C61°F16°C7 mph12 km/h from SouthwestPartly CloudyMostly Clear

Yes

Low of 36°F2°C, High of 58°F15°C
Wind: 7 mph11 km/h
Precipitation: 2% rain

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