Data: U.S. Fall Temperature Trends

Please click here to download local temperature trend data for 240+ U.S. locations.

• This dataset supports U.S., state-, and county-level charts downloadable from this page.

• Embeddable interactive maps and custom data views are available here through Observable

• Click here for a KML map download

• For background on these trends, their connections to climate change, and their local impacts, click here for the most recent fall package from Climate Matters.

METHODOLOGY

Average temperatures and days above normal were calculated for each meteorological fall (September, October, November) from 1970 to 2024 using data obtained from the Applied Climate Information System, which is developed, maintained, and operated by NOAA’s Regional Climate Centers. Fall days above normal are defined as the number of days where the average temperature was above the 1991-2020 NOAA/NCEI climate normal for the season. 

The map of the contiguous U.S. shows the change in average fall temperatures by county since 1970 with data from NOAA/NCEI’s Climate at a Glance. Previous versions of the Climate Matters map graphic showing the change in seasonal average temperature displayed the data by climate division. Note that although Connecticut recently replaced their counties with planning regions, data for Connecticut is displayed by county because NCEI data are not yet available for Connecticut’s planning regions.

Climate Central's local analyses include 247 stations. For reported data summaries of historical (1970-2024) observed fall warming trends based on linear regression, however, only 243 stations are included due to data completeness measures that were not met by four stations: Bend, Ore.; Twin Falls, Idaho; Hazard, Ky.; and Wheeling, W.Va. 

This Climate Matters analysis is based on open access data from the National Oceanic and Atmospheric Administration (NOAA).