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.
| 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 | 18.8 / 18.8 | 18.8 / 18.8 | 8.5 | 79.8 / 56.8 | 99.0 / 75.8 | Jul 15 | 0.9 | 3.5 | 8 | Jun 22 | Aug 13 | 72.3 | 72.2 | 85.5 | 1.3 | 99.0 | Jul 20 |
| Climate Division 1 | 19.2 / 19.0 | 19.2 / 19.0 | 8.5 | 79.9 / 58.8 | 99.4 / 76.5 | Jul 11 | 0.7 | 3.7 | 7 | Jun 06 | Aug 01 | 70.1 | 70.2 | 86.2 | 1.3 | 99.4 | Jun 17 |
| Climate Division 2 | 19.0 / 19.1 | 19.0 / 19.1 | 8.6 | 81.2 / 58.9 | 100.0 / 76.2 | Jul 11 | 0.8 | 3.6 | 7 | Jun 25 | Aug 19 | 71.2 | 71.0 | 86.4 | 1.3 | 100.0 | Jul 19 |
| Climate Division 3 | 19.0 / 18.8 | 19.0 / 18.8 | 8.2 | 82.2 / 59.3 | 100.4 / 76.4 | Jul 17 | 0.8 | 3.3 | 7 | May 28 | Jul 12 | 71.0 | 70.9 | 87.3 | 1.3 | 100.4 | Jun 10 |
| Climate Division 4 | 19.3 / 18.8 | 19.3 / 18.8 | 8.0 | 81.5 / 58.8 | 100.8 / 77.8 | Jul 10 | 0.7 | 3.4 | 7 | Jun 19 | Aug 24 | 72.3 | 72.2 | 87.7 | 1.4 | 100.8 | Jul 30 |
| Climate Division 5 | 18.6 / 19.0 | 18.6 / 19.0 | 8.3 | 80.8 / 58.2 | 99.7 / 76.7 | Jul 04 | 0.7 | 3.7 | 7 | Jul 04 | Aug 15 | 70.0 | 69.7 | 87.2 | 1.2 | 99.7 | Jul 24 |
| Climate Division 6 | 19.0 / 19.1 | 19.0 / 19.1 | 8.4 | 80.5 / 56.9 | 100.8 / 76.8 | Jul 12 | 0.8 | 3.5 | 7 | Jun 20 | Aug 12 | 72.1 | 72.1 | 86.2 | 1.3 | 99.3 | Jul 18 |
| Climate Division 7 | 19.1 / 19.2 | 19.1 / 19.2 | 7.6 | 80.3 / 54.7 | 103.5 / 74.9 | Jul 20 | 0.7 | 3.6 | 7 | Jun 17 | Jul 27 | 71.8 | 71.7 | 84.7 | 1.2 | 98.6 | Jul 06 |
| Climate Division 8 | 19.3 / 19.1 | 19.3 / 19.1 | 7.1 | 71.2 / 49.2 | 95.2 / 69.3 | Jul 13 | 0.6 | 3.7 | 7 | Jun 11 | Jul 15 | 63.8 | 63.8 | 77.7 | 1.2 | 91.5 | Jun 28 |
| Allegany | 19.2 / 19.2 | 19.2 / 19.2 | 7.3 | 78.7 / 52.9 | 102.6 / 74.2 | Jul 21 | 0.7 | 3.7 | 7 | Jun 06 | Jul 23 | 70.1 | 69.9 | 84.2 | 1.2 | 98.2 | Jul 01 |
| Anne Arundel | 19.1 / 18.9 | 19.1 / 18.9 | 8.1 | 80.9 / 58.8 | 100.8 / 78.0 | Jul 11 | 0.8 | 3.6 | 7 | Jun 25 | Aug 15 | 73.0 | 73.0 | 87.2 | 1.3 | 100.8 | Jul 31 |
| Baltimore | 18.9 / 18.7 | 18.9 / 18.7 | 8.2 | 80.6 / 56.6 | 100.6 / 76.9 | Jul 12 | 0.8 | 3.5 | 7 | Jun 17 | Aug 14 | 71.0 | 70.9 | 86.4 | 1.4 | 99.9 | Jul 26 |
| Calvert | 19.2 / 18.8 | 19.2 / 18.8 | 8.1 | 81.4 / 59.0 | 100.3 / 76.4 | Jul 11 | 0.7 | 3.5 | 7 | May 27 | Jul 21 | 72.0 | 71.9 | 86.2 | 1.4 | 100.3 | Jun 26 |
| Caroline | 19.2 / 19.3 | 19.2 / 19.3 | 8.1 | 81.8 / 58.7 | 100.2 / 76.2 | Jul 11 | 0.8 | 3.5 | 6 | Jun 26 | Aug 20 | 70.7 | 70.6 | 86.5 | 1.3 | 99.6 | Jul 19 |
| Carroll | 19.2 / 19.4 | 19.2 / 19.4 | 8.2 | 80.0 / 55.8 | 101.4 / 76.3 | Jul 11 | 0.7 | 3.6 | 7 | Jun 20 | Aug 04 | 70.0 | 69.9 | 85.0 | 1.2 | 98.6 | Jul 11 |
| Cecil | 18.8 / 19.3 | 18.8 / 19.3 | 8.5 | 79.8 / 56.9 | 101.7 / 76.5 | Jun 29 | 0.8 | 3.7 | 7 | Jun 26 | Aug 22 | 69.7 | 69.5 | 86.5 | 1.3 | 99.8 | Jul 24 |
| Charles | 19.1 / 18.8 | 19.1 / 18.8 | 7.9 | 82.9 / 59.5 | 100.5 / 76.2 | Jul 13 | 0.7 | 3.3 | 7 | May 05 | Jul 26 | 69.9 | 69.7 | 87.4 | 1.6 | 100.5 | Jun 05 |
| Dorchester | 19.0 / 19.2 | 19.0 / 19.2 | 8.6 | 81.3 / 59.2 | 99.9 / 77.0 | Jul 06 | 0.9 | 3.6 | 7 | Jun 25 | Aug 16 | 72.8 | 72.6 | 86.7 | 1.3 | 99.9 | Jul 18 |
| Frederick | 19.5 / 19.3 | 19.5 / 19.3 | 8.4 | 79.6 / 56.1 | 102.7 / 77.0 | Jul 14 | 0.7 | 3.7 | 7 | Jun 05 | Aug 04 | 72.8 | 72.8 | 85.8 | 1.3 | 98.9 | Jul 05 |
| Garrett | 19.3 / 19.0 | 19.3 / 19.0 | 7.2 | 71.3 / 49.2 | 95.2 / 69.4 | Jul 11 | 0.6 | 3.7 | 7 | Jun 11 | Jul 15 | 63.8 | 63.8 | 77.7 | 1.2 | 91.6 | Jun 28 |
| Harford | 18.9 / 18.8 | 18.9 / 18.8 | 8.0 | 80.4 / 56.8 | 101.0 / 77.1 | Jun 30 | 0.8 | 3.6 | 7 | Jun 26 | Aug 15 | 71.0 | 70.9 | 86.6 | 1.3 | 98.9 | Jul 23 |
| Howard | 19.0 / 19.2 | 19.0 / 19.2 | 8.2 | 81.1 / 57.3 | 101.2 / 76.8 | Jul 08 | 0.8 | 3.4 | 7 | Jun 23 | Aug 16 | 72.0 | 72.0 | 86.1 | 1.3 | 99.6 | Jul 28 |
| Kent | 18.6 / 19.0 | 18.6 / 19.0 | 8.3 | 80.6 / 58.0 | 99.5 / 77.0 | Jul 07 | 0.8 | 3.8 | 7 | Jul 08 | Aug 15 | 70.5 | 70.2 | 87.3 | 1.2 | 99.5 | Jul 26 |
| Montgomery | 19.1 / 18.7 | 19.1 / 18.7 | 8.2 | 81.2 / 58.5 | 101.6 / 77.1 | Jul 14 | 0.7 | 3.5 | 7 | Jun 22 | Aug 09 | 72.1 | 72.0 | 86.3 | 1.3 | 99.4 | Jul 22 |
| Prince George's | 19.3 / 18.8 | 19.3 / 18.8 | 7.9 | 82.1 / 58.9 | 101.3 / 77.6 | Jul 10 | 0.7 | 3.3 | 7 | Jun 18 | Aug 18 | 72.6 | 72.5 | 87.4 | 1.4 | 100.7 | Jul 23 |
| Queen Anne's | 19.0 / 19.1 | 19.0 / 19.1 | 8.3 | 80.9 / 58.2 | 99.8 / 76.5 | Jul 06 | 0.7 | 3.7 | 7 | Jul 04 | Aug 18 | 70.0 | 69.7 | 87.1 | 1.2 | 99.8 | Jul 24 |
| Somerset | 19.1 / 18.7 | 19.1 / 18.7 | 8.4 | 80.2 / 59.0 | 99.7 / 77.4 | Jul 15 | 0.7 | 3.6 | 7 | Jun 09 | Jul 20 | 71.6 | 71.5 | 86.6 | 1.2 | 99.7 | Jun 19 |
| St. Mary's | 19.1 / 18.8 | 19.1 / 18.8 | 8.0 | 81.8 / 59.1 | 100.3 / 76.8 | Jul 13 | 0.7 | 3.4 | 7 | Jun 11 | Aug 01 | 71.4 | 71.3 | 87.1 | 1.4 | 100.3 | Jul 01 |
| Talbot | 19.2 / 19.1 | 19.2 / 19.1 | 8.5 | 80.3 / 58.6 | 100.4 / 77.2 | Jul 12 | 0.7 | 3.7 | 6 | Jun 29 | Aug 10 | 70.9 | 70.6 | 86.5 | 1.3 | 100.4 | Jul 12 |
| Washington | 19.2 / 19.2 | 19.2 / 19.2 | 7.9 | 80.7 / 55.5 | 104.4 / 76.4 | Jul 19 | 0.6 | 3.8 | 7 | Jun 06 | Jul 19 | 70.8 | 70.7 | 86.0 | 1.2 | 99.2 | Jun 20 |
| Wicomico | 19.1 / 19.4 | 19.1 / 19.4 | 8.5 | 81.0 / 58.8 | 99.7 / 76.3 | Jul 07 | 0.7 | 3.6 | 7 | Jun 21 | Aug 11 | 69.4 | 69.3 | 86.3 | 1.3 | 99.7 | Jul 04 |
| Worcester | 19.3 / 18.9 | 19.3 / 18.9 | 8.2 | 79.0 / 58.6 | 99.1 / 76.1 | Jul 12 | 0.7 | 3.5 | 6 | Jun 16 | Jul 24 | 68.8 | 68.6 | 86.0 | 1.2 | 99.1 | Jun 24 |
| Baltimore city | 19.0 / 19.1 | 19.0 / 19.1 | 8.4 | 81.1 / 58.5 | 101.9 / 78.1 | Jul 09 | 0.9 | 3.5 | 7 | Jun 24 | Aug 19 | 72.6 | 72.5 | 87.8 | 1.4 | 101.9 | Jul 29 |