Preliminary data indicates that the statewide average temperature in February was 42.9o F, which is 5.8o F above the 1991-2020 mean value of 37.1o F (Figure 1). February 2023 was the third warmest since observations began in 1895.
Delaware’s statewide precipitation for February 2023 averaged 1.80 inches, 1.11 inches below the 1991-2020 mean (Figure 2). This month’s precipitation was tied with 1913 as the 19th driest since 1895.
Statewide Spatial Anomalies
Data from the Delaware Environmental Observing System (DEOS) show that temperature departures were uniformly positive across the entire state (Figure 3) with some stations seeing positive anomalies of over 7.0o F. Precipitation anomalies were uniformly negative across the entire state, with the largest negative anomalies found in New Castle County (Figure 4).
Temperatures were much above normal across the eastern one-half of the United States and below normal across most of the western portion of the country (Figure 5). Precipitation departures were mixed across the country, with the largest positive precipitation anomalies found in the western Great Lakes region (Figure 6). Precipitation was below normal over much of the Atlantic and Gulf Coasts and the Pacific Northwest. The 500 hPa height pattern for February shows a jet stream ridge over the eastern United States and a jet stream trough over the west, contributing to the temperature anomalies across each region (Figure 7).