Yes
you do need a jacket based on the weather in Herndon, VA 20171, USA 1 second ago
Why? Because it's colder than a polar bear's pyjamas!
30°F-1°C & Cloudy
Wind is 4 mph7 km/h from the East, gusting to 12 mph20 km/h
| December 14 | ||||
| 9pm | 30°F-1°C | 5 mph8 km/h East | Mostly Cloudy | |
| 10pm | 29°F-2°C | 5 mph8 km/h East | Mostly Cloudy | |
| 11pm | 29°F-1°C | 5 mph8 km/h East | Cloudy | |
| December 15 | ||||
| 12am | 28°F-2°C | 5 mph8 km/h East | Cloudy | |
| 1am | 28°F-2°C | 5 mph8 km/h East | Cloudy | |
| 2am | 29°F-2°C | 5 mph8 km/h East | Cloudy | |
| 3am | 29°F-2°C | 5 mph8 km/h East | Cloudy | |
| 4am | 29°F-2°C | 4 mph7 km/h East | Cloudy | |
| 5am | 29°F-1°C | 4 mph7 km/h East | Cloudy | |
| 6am | 30°F-1°C | 4 mph7 km/h East | Cloudy | |
| 7am | 29°F-1°C | 5 mph8 km/h East | Cloudy | |
| 8am | 30°F-1°C | 5 mph7 km/h East | Cloudy | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| December 14 | 22°F-5°C | 39°F4°C | 2 mph3 km/h from East | Mostly Clear | Mostly Cloudy |
| December 15 | 28°F-2°C | 39°F4°C | 4 mph7 km/h from East | Drizzle | Rain |
| December 16 | 38°F3°C | 52°F11°C | 4 mph7 km/h from South | Cloudy | Drizzle |
| December 17 | 42°F6°C | 62°F17°C | 5 mph8 km/h from West | Mostly Clear | Mostly Clear |
| December 18 | 38°F3°C | 51°F11°C | 4 mph7 km/h from South | Rain | Rain |
| December 19 | 31°F-1°C | 48°F9°C | 10 mph17 km/h from Northwest | Mostly Clear | Mostly Clear |
| December 20 | 27°F-3°C | 38°F4°C | 4 mph6 km/h from Southeast | Mostly Cloudy | Partly Cloudy |
Yes
Low of 28°F-3°C, High of 38°F4°CWind: 4 mph7 km/h
Precipitation: 64% rain