This seems to miss out the broader dimensions of "nice weather".
For example, 39F/3.8C on a cloudy winter day on the US east coast is entirely different than the same temperatures in the (intense) sun and low humidity of the high desert in the US southwest.
Conversely, 78F/25.5C in May in the US southwest on a windy day is totally miserable to be out in, because the wind can hit sustained bursts of 25mph/40kmh with much higher gusts, whereas the same temperature on a sunny May day in London might be paradise.
For example, 39F/3.8C on a cloudy winter day on the US east coast is entirely different than the same temperatures in the (intense) sun and low humidity of the high desert in the US southwest.
Conversely, 78F/25.5C in May in the US southwest on a windy day is totally miserable to be out in, because the wind can hit sustained bursts of 25mph/40kmh with much higher gusts, whereas the same temperature on a sunny May day in London might be paradise.