Yes

you do need a jacket based on the weather in Gainsborough, UK 1 second ago

Why? Because the cold's there, but it's just a reminder, not an invasion!
47°F8°C & Mostly Cloudy

Wind is 7 mph11 km/h from the North, gusting to 13 mph21 km/h
April 24
4am48°F9°C7 mph12 km/h NorthMostly Cloudy
5am50°F10°C7 mph12 km/h NortheastMostly Cloudy
6am52°F11°C7 mph12 km/h NortheastMostly Cloudy
7am54°F12°C7 mph11 km/h NortheastMostly Cloudy
8am55°F13°C7 mph11 km/h NortheastMostly Cloudy
9am56°F13°C7 mph11 km/h NortheastMostly Cloudy
10am56°F14°C6 mph10 km/h NortheastMostly Cloudy
11am57°F14°C6 mph9 km/h NortheastMostly Cloudy
12pm56°F13°C7 mph11 km/h NortheastMostly Cloudy
1pm56°F13°C7 mph11 km/h NortheastPartly Cloudy
2pm54°F12°C7 mph12 km/h EastPartly Cloudy
3pm52°F11°C8 mph12 km/h EastMostly Clear
DateLowHighWindDayNight
April 2344°F6°C57°F14°C7 mph11 km/h from NortheastMostly CloudyPartly Cloudy
April 2440°F4°C58°F15°C6 mph10 km/h from SoutheastCloudyMostly Cloudy
April 2542°F6°C60°F15°C5 mph9 km/h from SoutheastCloudyMostly Cloudy
April 2646°F8°C66°F19°C9 mph14 km/h from SouthwestPartly CloudyPartly Cloudy
April 2746°F8°C69°F20°C4 mph7 km/h from SouthwestMostly CloudyMostly Cloudy
April 2850°F10°C72°F22°C7 mph11 km/h from SoutheastPartly CloudyMostly Clear
April 2951°F11°C75°F24°C5 mph8 km/h from SoutheastMostly ClearMostly Clear

Yes

Low of 39°F4°C, High of 58°F15°C
Wind: 6 mph10 km/h
Precipitation: None

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