station_proxy,city,period,annual_sunshine_hours,one_sun_equivalent_kWh_per_m2,metric_note
London–Gatwick,London,1961-1990,1574.2,1574.2,Equivalent only: sunshine hours × 1 kW/m²; not measured annual GHI
Seattle–Tacoma,Seattle,1961-1990,2169.7,2169.7,Equivalent only: sunshine hours × 1 kW/m²; not measured annual GHI
Difference (Seattle-London),,1961-1990,595.5,595.5,
Seattle percent above London,,1961-1990,37.8%,,
