Yes

you do need a jacket based on the weather in Longmont, CO 80504, USA 1 second ago

Why? Because Jack Frost is nipping at your nose!
28°F-2°C & Partly Cloudy

Wind is 2 mph4 km/h from the Northeast, gusting to 5 mph8 km/h
January 11
7am28°F-2°C3 mph4 km/h NortheastClear
8am31°F-1°C2 mph4 km/h EastClear
9am29°F-2°C6 mph10 km/h EastClear
10am24°F-5°C6 mph10 km/h EastClear
11am30°F-1°C5 mph8 km/h NorthClear
12pm35°F2°C10 mph15 km/h NorthPartly Cloudy
1pm37°F3°C11 mph17 km/h NorthMostly Cloudy
2pm39°F4°C6 mph10 km/h NorthPartly Cloudy
3pm40°F4°C12 mph20 km/h NorthMostly Cloudy
4pm39°F4°C16 mph25 km/h NorthWindy
5pm37°F3°C15 mph24 km/h NorthMostly Cloudy
6pm35°F2°C10 mph17 km/h NorthPartly Cloudy
DateLowHighWindDayNight
January 1122°F-6°C40°F4°C9 mph15 km/h from NorthPartly CloudyPartly Cloudy
January 1214°F-10°C36°F2°C4 mph7 km/h from SoutheastMostly ClearMostly Clear
January 1311°F-12°C35°F2°C3 mph5 km/h from SouthClearClear
January 1412°F-11°C42°F6°C4 mph7 km/h from SouthMostly ClearMostly Clear
January 1518°F-8°C45°F7°C3 mph5 km/h from SouthClearClear
January 1618°F-8°C48°F9°C2 mph3 km/h from SouthwestMostly ClearMostly Clear
January 1717°F-8°C38°F3°C8 mph12 km/h from EastPartly CloudyCloudy

Yes

Low of 14°F-10°C, High of 37°F3°C
Wind: 4 mph7 km/h
Precipitation: None

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