Preliminary data indicates that the statewide average temperature in June was 74.1o F, which is 2.0o F above the 1981-2010 mean value of 72.1o F (Figure 1). June 2020 was the 8th warmest since observations began in 1895.
Delaware’s statewide precipitation for June 2020 averaged 2.21 inches, 1.52 inches below the 1981-2010 mean (Figure 2). The June 2020 precipitation amount was the 17th driest since 1895, placing this month in the driest one-third of all Junes since the start of observations.
Statewide Spatial Anomalies
Data from the Delaware Environmental Observing System (DEOS) show that temperature departures were generally above normal throughout the State (Figure 3). Precipitation was below normal at almost all locations except for a few stations where heavier convective storms occurred during the month (Figure 4).
Temperatures were above normal across the Great Plains and much of the central portion of the country, while near normal temperatures were found in both the northwest and southeast regions of the United States (Figure 5). Precipitation varied greatly across the country, with little to no precipitation falling across the desert southwest, and below normal precipitation dominating the northeast and central portions of the United States (Figure 6). The 500 hPa height pattern for June showed a weak ridge dominating the central United States leading to generally warm and dry weather across that region (Figure 7).