Reference Data in San Diego 12 indicators covering reference data for San Diego. IndicatorLatest Year10-yr change Rank Cooling and heating degree days - Cities and FUAs — Cooling degree 366.94 Degree days 2025 down 40.6% 325th Cooling and heating degree days - Cities and FUAs — Change in cooling -181.07 Degree days 2025 down 359.8% 1291st Cooling and heating degree days - Cities and FUAs 457.47 Degree days 2025 down 19.2% 1075th Cooling and heating degree days - Cities and FUAs — Change in heating -264.07 Degree days 2025 down 70.0% 569th Precipitation - Cities and FUAs — Extreme precipitation days 2.95 Days per year 2024 up 65.1% 995th Precipitation - Cities and FUAs — Change in extreme precipitation -0.7837 Days per year 2024 up 59.8% 1043rd Dependency ratio - Cities and FUAs 24.4 Percentage of population aged 15-64 years 2024 up 33.3% 858th Wind threats - Cities and FUAs — Exposure to wind threats 11.76 Percentage of area 2023 up 99.7% 194th Coastal flooding - Cities and FUAs — Built-up area exposure to 0.0125 Percentage of built-up area 2022 down 3.5% 243rd Main mode of transport to work - Cities and FUAs — Employed persons 1.35 million Persons 2023 up 0.6% 15th Internet speed - Cities and FUAs — Downloading speed -4.5 Percentage of national value 2025 down 221.4% 1027th Internet speed - Cities and FUAs — Uploading speed -25.1 Percentage of national value 2025 down 85.9% 1114th