Preliminary data indicates that the statewide average temperature in November was 50.3° F, which is 2.8° F above the 1991-2020 mean value of 47.5° F (Figure 1). November 2022 was the 14th warmest November since observations began in 1895.
Delaware’s statewide precipitation for November 2022 averaged 3.01 inches, 0.26 inches below the 1991-2020 mean (Figure 2). This month’s precipitation was near the long-term average of values since 1895.
Statewide Spatial Anomalies
Data from the Delaware Environmental Observing System (DEOS) show that temperature departures were uniformly positive across the state (Figure 3) with some stations seeing positive anomalies topping 4.0° F in northeastern New Castle County. Precipitation observations were generally below normal in all areas except for a few stations that received significant localized precipitation (Figure 4).
Temperatures were above normal across most of the eastern one-third of the United States, with the largest positive anomalies found along the Atlantic Coast (Figure 5). The western half of the country saw below normal temperatures, with the largest negative anomalies found across Montana. Precipitation anomalies were very mixed across the country, with no coherent regions experiencing either dry or wet conditions (Figure 6) The 500 hPa height pattern for November shows a jet stream ridge over the eastern United States and a trough over the west contributing to the temperature anomalies across those regions (Figure 7).