Extreme Heatwaves Summary Table
in Maryland: January 1 - October 7, 2026
Data source: NOAA nClimGrid-Daily dataset (19912020 Climatology)
| Region | No. of Hot Days/Nights | Climatological No. of Hot Days/Nights | No. of Joint Hot Days/Nights | Mean Temp among all Joint Hot Days/Nigths | Maxium Temp among all Joint Hot Days/Nigths | Day when Max Temp among all Joint Hot Days occurred | No. of Heatwaves (#) | Mean Duration of Heatwaves (days) | Longest Heatwave (days) | Start of the First Heatwave | Start of Last Heatwave | Mean Temp of all Temps in Heatwaves | Mean Temp of Heatwaves' Mean Temps | Max Temp of Heatwaves' Mean Temps | Number of Heatwave when Max Temp of Heatwaves' Mean Temps occurred | Max Temp within all Heatwaves | Day when Max Temp within all Heatwaves occurred |
|---|
| Maryland Statewide | 25 / 20 | 14.6 / 14.7 | 16 | 88.6 / 62.2 | 100.0 / 76.0 | 4 Jul / 3 Jul | 2 | 3.0 | 3 | 15 Apr | 2 Jul | 80.1 | 80.1 | 86.3 | 2.0 | 100.0 | 4 Jul |
| Climate Division 1 | 31 / 23 | 14.4 / 14.2 | 16 | 86.8 / 62.2 | 100.8 / 75.6 | 4 Jul / 4 Jul | 1 | 4.0 | 4 | 15 Apr | 15 Apr | 72.4 | 72.4 | 72.4 | 1.0 | 88.0 | 16 Apr |
| Climate Division 2 | 24 / 27 | 14.4 / 14.8 | 18 | 90.1 / 64.2 | 101.9 / 77.3 | 5 Jul / 4 Jul | 3 | 3.0 | 3 | 15 Apr | 3 Jul | 81.2 | 81.2 | 88.3 | 3.0 | 101.9 | 5 Jul |
| Climate Division 3 | 22 / 17 | 14.6 / 14.1 | 13 | 88.1 / 62.7 | 100.3 / 77.2 | 4 Jul / 3 Jul | 1 | 3.0 | 3 | 19 May | 19 May | 80.5 | 80.5 | 80.5 | 1.0 | 94.2 | 20 May |
| Climate Division 4 | 23 / 16 | 14.7 / 14.5 | 14 | 89.7 / 62.7 | 101.1 / 78.5 | 4 Jul / 3 Jul | 2 | 3.0 | 3 | 15 Apr | 2 Jul | 81.7 | 81.8 | 88.3 | 2.0 | 101.1 | 4 Jul |
| Climate Division 5 | 25 / 28 | 14.5 / 14.7 | 16 | 90.5 / 64.9 | 102.1 / 78.2 | 4 Jul / 4 Jul | 2 | 3.0 | 3 | 15 Apr | 2 Jul | 81.4 | 81.4 | 88.2 | 2.0 | 102.1 | 4 Jul |
| Climate Division 6 | 24 / 20 | 14.6 / 14.3 | 15 | 89.3 / 61.4 | 100.5 / 77.1 | 4 Jul / 3 Jul | 2 | 3.0 | 3 | 15 Apr | 2 Jul | 81.1 | 81.1 | 87.4 | 2.0 | 100.5 | 4 Jul |
| Climate Division 7 | 21 / 25 | 14.8 / 14.5 | 13 | 88.2 / 60.2 | 98.2 / 73.2 | 4 Jul / 3 Jul | 2 | 3.0 | 3 | 15 Apr | 2 Jul | 78.9 | 78.9 | 84.6 | 2.0 | 98.2 | 4 Jul |
| Climate Division 8 | 26 / 41 | 14.9 / 14.4 | 18 | 79.7 / 56.3 | 90.1 / 67.9 | 4 Jul / 3 Jul | 2 | 3.5 | 4 | 15 Apr | 1 Jul | 73.9 | 73.2 | 77.8 | 2.0 | 90.1 | 4 Jul |
| Allegany | 20 / 31 | 15.0 / 14.3 | 13 | 85.9 / 57.8 | 96.9 / 71.2 | 4 Jul / 3 Jul | 2 | 3.0 | 3 | 15 Apr | 2 Jul | 77.7 | 77.7 | 83.1 | 2.0 | 96.9 | 4 Jul |
| Anne Arundel | 24 / 16 | 14.8 / 14.4 | 13 | 90.0 / 64.2 | 101.3 / 79.1 | 4 Jul / 3 Jul | 2 | 3.0 | 3 | 15 Apr | 2 Jul | 81.8 | 81.8 | 88.6 | 2.0 | 101.3 | 4 Jul |
| Baltimore | 24 / 22 | 14.6 / 14.7 | 15 | 89.9 / 61.2 | 101.3 / 77.3 | 4 Jul / 3 Jul | 2 | 3.0 | 3 | 15 Apr | 2 Jul | 81.4 | 81.4 | 87.8 | 2.0 | 101.3 | 4 Jul |
| Calvert | 22 / 18 | 14.5 / 14.2 | 13 | 87.7 / 62.6 | 99.8 / 77.5 | 4 Jul / 4 Jul | 1 | 3.0 | 3 | 19 May | 19 May | 80.3 | 80.3 | 80.3 | 1.0 | 93.5 | 20 May |
| Caroline | 24 / 29 | 14.6 / 14.4 | 17 | 92.0 / 64.8 | 102.8 / 77.1 | 5 Jul / 4 Jul | 3 | 3.0 | 3 | 15 Apr | 3 Jul | 81.8 | 81.8 | 88.7 | 3.0 | 102.8 | 5 Jul |
| Carroll | 22 / 22 | 15.5 / 14.4 | 15 | 88.7 / 60.3 | 99.6 / 75.7 | 4 Jul / 3 Jul | 2 | 3.0 | 3 | 15 Apr | 2 Jul | 80.3 | 80.3 | 86.3 | 2.0 | 99.6 | 4 Jul |
| Cecil | 25 / 31 | 14.6 / 14.5 | 18 | 90.1 / 63.9 | 101.8 / 77.7 | 3 Jul / 3 Jul | 2 | 3.5 | 4 | 14 Apr | 2 Jul | 79.5 | 80.6 | 88.2 | 2.0 | 101.8 | 3 Jul |
| Charles | 23 / 16 | 14.8 / 14.3 | 13 | 89.6 / 63.3 | 100.9 / 77.7 | 4 Jul / 3 Jul | 1 | 3.0 | 3 | 2 Jul | 2 Jul | 88.0 | 88.0 | 88.0 | 1.0 | 100.9 | 4 Jul |
| Dorchester | 26 / 23 | 14.7 / 14.7 | 16 | 89.6 / 64.4 | 101.7 / 77.0 | 5 Jul / 4 Jul | 2 | 3.0 | 3 | 19 May | 3 Jul | 84.4 | 84.4 | 88.1 | 2.0 | 101.7 | 5 Jul |
| Frederick | 21 / 21 | 14.8 / 14.4 | 15 | 88.9 / 61.4 | 99.4 / 76.5 | 4 Jul / 3 Jul | 2 | 3.0 | 3 | 15 Apr | 2 Jul | 80.6 | 80.6 | 86.7 | 2.0 | 99.4 | 4 Jul |
| Garrett | 26 / 41 | 14.9 / 14.5 | 18 | 79.7 / 56.3 | 90.1 / 67.9 | 3 Jul / 3 Jul | 2 | 3.5 | 4 | 15 Apr | 1 Jul | 73.9 | 73.3 | 77.9 | 2.0 | 90.1 | 3 Jul |
| Harford | 24 / 25 | 14.9 / 14.5 | 17 | 90.3 / 62.9 | 102.0 / 78.2 | 3 Jul / 3 Jul | 2 | 3.5 | 4 | 15 Apr | 2 Jul | 82.3 | 81.4 | 88.2 | 2.0 | 102.0 | 3 Jul |
| Howard | 21 / 21 | 14.9 / 14.2 | 14 | 89.2 / 60.8 | 100.1 / 76.8 | 4 Jul / 3 Jul | 2 | 3.0 | 3 | 15 Apr | 2 Jul | 80.9 | 80.9 | 87.0 | 2.0 | 100.1 | 4 Jul |
| Kent | 25 / 26 | 14.5 / 14.4 | 15 | 90.0 / 64.8 | 102.1 / 78.5 | 4 Jul / 4 Jul | 2 | 3.0 | 3 | 15 Apr | 2 Jul | 81.5 | 81.5 | 88.5 | 2.0 | 102.1 | 4 Jul |
| Montgomery | 22 / 20 | 15.1 / 14.4 | 15 | 89.6 / 62.7 | 99.6 / 77.5 | 4 Jul / 3 Jul | 2 | 3.0 | 3 | 15 Apr | 2 Jul | 81.4 | 81.4 | 87.3 | 2.0 | 99.6 | 4 Jul |
| Prince George's | 21 / 16 | 14.8 / 14.6 | 14 | 89.8 / 62.4 | 101.0 / 78.0 | 4 Jul / 3 Jul | 2 | 3.0 | 3 | 15 Apr | 2 Jul | 81.6 | 81.6 | 88.1 | 2.0 | 101.0 | 4 Jul |
| Queen Anne's | 24 / 28 | 14.6 / 15.0 | 15 | 90.4 / 64.4 | 102.1 / 78.1 | 4 Jul / 4 Jul | 1 | 3.0 | 3 | 15 Apr | 15 Apr | 74.8 | 74.8 | 74.8 | 1.0 | 89.5 | 17 Apr |
| Somerset | 27 / 21 | 14.2 / 14.0 | 14 | 87.0 / 63.6 | 100.4 / 76.2 | 4 Jul / 4 Jul | 0 | 0.0 | 0 | - | - | - | - | - | - | - | - |
| St. Mary's | 21 / 24 | 14.3 / 14.2 | 14 | 87.5 / 63.3 | 99.7 / 76.9 | 4 Jul / 4 Jul | 1 | 3.0 | 3 | 19 May | 19 May | 80.3 | 80.3 | 80.3 | 1.0 | 92.9 | 20 May |
| Talbot | 24 / 26 | 14.7 / 14.5 | 17 | 90.8 / 65.6 | 101.6 / 78.1 | 5 Jul / 4 Jul | 3 | 3.0 | 3 | 15 Apr | 3 Jul | 81.1 | 81.1 | 88.5 | 3.0 | 101.6 | 5 Jul |
| Washington | 21 / 25 | 14.9 / 14.6 | 14 | 88.5 / 59.8 | 99.5 / 75.0 | 4 Jul / 3 Jul | 2 | 3.0 | 3 | 15 Apr | 2 Jul | 79.9 | 79.9 | 86.1 | 2.0 | 99.5 | 4 Jul |
| Wicomico | 29 / 23 | 14.3 / 14.2 | 16 | 89.2 / 63.0 | 101.9 / 75.6 | 4 Jul / 4 Jul | 2 | 3.0 | 3 | 15 Apr | 3 Jul | 80.6 | 80.6 | 87.5 | 2.0 | 101.9 | 4 Jul |
| Worcester | 33 / 24 | 14.4 / 14.7 | 17 | 86.2 / 62.7 | 100.4 / 75.3 | 4 Jul / 17 Jul | 1 | 4.0 | 4 | 15 Apr | 15 Apr | 72.0 | 72.0 | 72.0 | 1.0 | 87.4 | 16 Apr |
| Baltimore city | 22 / 16 | 14.5 / 14.5 | 13 | 90.8 / 63.8 | 102.1 / 79.7 | 4 Jul / 3 Jul | 2 | 3.0 | 3 | 15 Apr | 2 Jul | 82.5 | 82.5 | 89.4 | 2.0 | 102.1 | 4 Jul |