File name: Temperature-Monthly-Difference-from-average-CONUS-2023-12-00-small.png
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Monthly temperature anomalies for December 2023 compared to the 1991-2020 average. Red areas were warmer than the 30-year average for the month, and blue areas were cooler. White and very light areas had temperatures close to the long-term average. Much the country experienced warmer than average temperatures in December 2023, with the largest anomalies occurring across the northern tier of the country, including areas surrounding the Great Lakes. Map by NOAA Climate.gov, based on data from the National Centers for Environmental Information (NCEI).