Weather by State

Open-Meteo achieves approximately ±2°F accuracy for the first 24 hours, degrading to ±5°F at 5-7 days. It combines multiple global forecast models (ECMWF, GFS, ICON) and selects the best one for each location. Short-range forecasts (1-3 days) are quite reliable; 5-7 day forecasts are directionally accurate.

California and Hawaii are often cited as having the best weather due to mild temperatures, low humidity, and abundant sunshine. San Diego averages 266 sunny days/year. For those who prefer seasons, states like Colorado offer sunny winters with skiing. Florida offers warm winters but hot, humid summers and hurricane risk.

Arizona and Florida have the highest average temperatures year-round. Phoenix, AZ regularly exceeds 110°F in summer. Death Valley, CA holds the world record for highest air temperature at 134°F (1913). In terms of year-round heat, Florida has the highest average annual temperature of any contiguous US state.

Alaska is by far the coldest state, with temperatures as low as -80°F in winter. Among the contiguous 48 states, North Dakota and Minnesota experience the coldest winters, with average January temperatures well below 0°F. The record low in the lower 48 is -70°F in Rogers Pass, Montana (1954).