Reference Data in Boulder 12 indicators covering reference data for Boulder. IndicatorLatest Year10-yr change Rank Cooling and heating degree days - Cities and FUAs — Cooling degree 16.3 Degree days 2025 down 80.8% 1014th Cooling and heating degree days - Cities and FUAs — Change in cooling -49.07 Degree days 2025 down 350.2% 1114th Cooling and heating degree days - Cities and FUAs 3,762 Degree days 2025 down 10.1% 16th Cooling and heating degree days - Cities and FUAs — Change in heating -659.64 Degree days 2025 down 180.3% 1199th Precipitation - Cities and FUAs — Extreme precipitation days 1.86 Days per year 2024 down 26.9% 1149th Precipitation - Cities and FUAs — Change in extreme precipitation -1.3 Days per year 2024 down 111.0% 1142nd Dependency ratio - Cities and FUAs 25.3 Percentage of population aged 15-64 years 2024 up 48.0% 818th Wind threats - Cities and FUAs — Exposure to wind threats 46.6 Percentage of area 2023 up 180.0% 133rd Coastal flooding - Cities and FUAs — Built-up area exposure to 0 Percentage of built-up area 2022 — 277th Main mode of transport to work - Cities and FUAs — Employed persons 125,854 Persons 2023 down 9.4% 141st Internet speed - Cities and FUAs — Downloading speed 2.4 Percentage of national value 2025 down 86.8% 798th Internet speed - Cities and FUAs — Uploading speed 2.7 Percentage of national value 2025 down 93.8% 661st