Reference Data in Seattle 16 indicators covering reference data for Seattle. IndicatorLatest Year10-yr change Rank Cooling and heating degree days - Cities and FUAs — Cooling degree 6.62 Degree days 2025 down 92.2% 1112th Cooling and heating degree days - Cities and FUAs — Change in cooling -41.07 Degree days 2025 down 209.2% 1069th Cooling and heating degree days - Cities and FUAs 2,768 Degree days 2025 up 6.5% 110th Cooling and heating degree days - Cities and FUAs — Change in heating -366.52 Degree days 2025 up 31.5% 742nd Cooling and heating degree days - Cities and FUAs — Change in heating 53.84 % change on previous year 2024 up 105.4% 215th Cooling and heating degree days - Cities and FUAs, annual growth rate -10.83 % change on previous year 2025 down 16.1% 809th Cooling and heating degree days - Cities and FUAs — Change in cooling -368.13 % change on previous year 2025 down 282.0% 1222nd Cooling and heating degree days - Cities and FUAs — Cooling degree -89.49 % change on previous year 2025 down 313.8% 1154th Precipitation - Cities and FUAs — Extreme precipitation days 21.53 Days per year 2024 down 38.9% 153rd Precipitation - Cities and FUAs — Change in extreme precipitation -1.84 Days per year 2024 down 115.5% 1194th Dependency ratio - Cities and FUAs 21.9 Percentage of population aged 15-64 years 2024 up 24.4% 959th Wind threats - Cities and FUAs — Exposure to wind threats 13.09 Percentage of area 2023 down 34.1% 188th Coastal flooding - Cities and FUAs — Built-up area exposure to 0.5213 Percentage of built-up area 2022 up 0.6% 129th Main mode of transport to work - Cities and FUAs — Employed persons 1.64 million Persons 2023 up 0.5% 13th Internet speed - Cities and FUAs — Downloading speed 9.1 Percentage of national value 2025 down 31.1% 507th Internet speed - Cities and FUAs — Uploading speed 2.3 Percentage of national value 2025 up 110.4% 661st