Extreme Heatwaves in Maryland
1951-2000 Baseline Climatology: January 1 - December 31


Definition: Hot Day/Night: Daily Tmax & Tmin > 95th Percentile Thresholds | Heatwave: 3 or more consecutive Joint Hot Days/Nights.
Data Source: NOAA nClimGrid-Daily v1.0.0.


RegionNo. of Hot Days/NightsClimatological No. of Hot Days/NightsNo. of Joint Hot Days/NightsMean Temp among all Joint Hot Days/NigthsMaxium Temp among all Joint Hot Days/NigthsDay when Max Temp among all Joint Hot Days occurredNo. of Heatwaves (#)Mean Duration of Heatwaves (days)Longest Heatwave (days)Start of the First HeatwaveStart of Last HeatwaveMean Temp of all Temps in HeatwavesMean Temp of Heatwaves' Mean TempsMax Temp of Heatwaves' Mean TempsNumber of Heatwave when Max Temp of Heatwaves' Mean Temps occurredMax Temp within all HeatwavesDay when Max Temp within all Heatwaves occurred
Maryland Statewide18.8 / 18.818.8 / 18.88.579.8 / 56.899.0 / 75.8Jul 150.93.58Jun 22Aug 1372.372.285.51.399.0Jul 20
Climate Division 119.2 / 19.019.2 / 19.08.579.9 / 58.899.4 / 76.5Jul 110.73.77Jun 06Aug 0170.170.286.21.399.4Jun 17
Climate Division 219.0 / 19.119.0 / 19.18.681.2 / 58.9100.0 / 76.2Jul 110.83.67Jun 25Aug 1971.271.086.41.3100.0Jul 19
Climate Division 319.0 / 18.819.0 / 18.88.282.2 / 59.3100.4 / 76.4Jul 170.83.37May 28Jul 1271.070.987.31.3100.4Jun 10
Climate Division 419.3 / 18.819.3 / 18.88.081.5 / 58.8100.8 / 77.8Jul 100.73.47Jun 19Aug 2472.372.287.71.4100.8Jul 30
Climate Division 518.6 / 19.018.6 / 19.08.380.8 / 58.299.7 / 76.7Jul 040.73.77Jul 04Aug 1570.069.787.21.299.7Jul 24
Climate Division 619.0 / 19.119.0 / 19.18.480.5 / 56.9100.8 / 76.8Jul 120.83.57Jun 20Aug 1272.172.186.21.399.3Jul 18
Climate Division 719.1 / 19.219.1 / 19.27.680.3 / 54.7103.5 / 74.9Jul 200.73.67Jun 17Jul 2771.871.784.71.298.6Jul 06
Climate Division 819.3 / 19.119.3 / 19.17.171.2 / 49.295.2 / 69.3Jul 130.63.77Jun 11Jul 1563.863.877.71.291.5Jun 28
Allegany19.2 / 19.219.2 / 19.27.378.7 / 52.9102.6 / 74.2Jul 210.73.77Jun 06Jul 2370.169.984.21.298.2Jul 01
Anne Arundel19.1 / 18.919.1 / 18.98.180.9 / 58.8100.8 / 78.0Jul 110.83.67Jun 25Aug 1573.073.087.21.3100.8Jul 31
Baltimore18.9 / 18.718.9 / 18.78.280.6 / 56.6100.6 / 76.9Jul 120.83.57Jun 17Aug 1471.070.986.41.499.9Jul 26
Calvert19.2 / 18.819.2 / 18.88.181.4 / 59.0100.3 / 76.4Jul 110.73.57May 27Jul 2172.071.986.21.4100.3Jun 26
Caroline19.2 / 19.319.2 / 19.38.181.8 / 58.7100.2 / 76.2Jul 110.83.56Jun 26Aug 2070.770.686.51.399.6Jul 19
Carroll19.2 / 19.419.2 / 19.48.280.0 / 55.8101.4 / 76.3Jul 110.73.67Jun 20Aug 0470.069.985.01.298.6Jul 11
Cecil18.8 / 19.318.8 / 19.38.579.8 / 56.9101.7 / 76.5Jun 290.83.77Jun 26Aug 2269.769.586.51.399.8Jul 24
Charles19.1 / 18.819.1 / 18.87.982.9 / 59.5100.5 / 76.2Jul 130.73.37May 05Jul 2669.969.787.41.6100.5Jun 05
Dorchester19.0 / 19.219.0 / 19.28.681.3 / 59.299.9 / 77.0Jul 060.93.67Jun 25Aug 1672.872.686.71.399.9Jul 18
Frederick19.5 / 19.319.5 / 19.38.479.6 / 56.1102.7 / 77.0Jul 140.73.77Jun 05Aug 0472.872.885.81.398.9Jul 05
Garrett19.3 / 19.019.3 / 19.07.271.3 / 49.295.2 / 69.4Jul 110.63.77Jun 11Jul 1563.863.877.71.291.6Jun 28
Harford18.9 / 18.818.9 / 18.88.080.4 / 56.8101.0 / 77.1Jun 300.83.67Jun 26Aug 1571.070.986.61.398.9Jul 23
Howard19.0 / 19.219.0 / 19.28.281.1 / 57.3101.2 / 76.8Jul 080.83.47Jun 23Aug 1672.072.086.11.399.6Jul 28
Kent18.6 / 19.018.6 / 19.08.380.6 / 58.099.5 / 77.0Jul 070.83.87Jul 08Aug 1570.570.287.31.299.5Jul 26
Montgomery19.1 / 18.719.1 / 18.78.281.2 / 58.5101.6 / 77.1Jul 140.73.57Jun 22Aug 0972.172.086.31.399.4Jul 22
Prince George's19.3 / 18.819.3 / 18.87.982.1 / 58.9101.3 / 77.6Jul 100.73.37Jun 18Aug 1872.672.587.41.4100.7Jul 23
Queen Anne's19.0 / 19.119.0 / 19.18.380.9 / 58.299.8 / 76.5Jul 060.73.77Jul 04Aug 1870.069.787.11.299.8Jul 24
Somerset19.1 / 18.719.1 / 18.78.480.2 / 59.099.7 / 77.4Jul 150.73.67Jun 09Jul 2071.671.586.61.299.7Jun 19
St. Mary's19.1 / 18.819.1 / 18.88.081.8 / 59.1100.3 / 76.8Jul 130.73.47Jun 11Aug 0171.471.387.11.4100.3Jul 01
Talbot19.2 / 19.119.2 / 19.18.580.3 / 58.6100.4 / 77.2Jul 120.73.76Jun 29Aug 1070.970.686.51.3100.4Jul 12
Washington19.2 / 19.219.2 / 19.27.980.7 / 55.5104.4 / 76.4Jul 190.63.87Jun 06Jul 1970.870.786.01.299.2Jun 20
Wicomico19.1 / 19.419.1 / 19.48.581.0 / 58.899.7 / 76.3Jul 070.73.67Jun 21Aug 1169.469.386.31.399.7Jul 04
Worcester19.3 / 18.919.3 / 18.98.279.0 / 58.699.1 / 76.1Jul 120.73.56Jun 16Jul 2468.868.686.01.299.1Jun 24
Baltimore city19.0 / 19.119.0 / 19.18.481.1 / 58.5101.9 / 78.1Jul 090.93.57Jun 24Aug 1972.672.587.81.4101.9Jul 29