Table 1.
Mean number of days per year defined as heatwave days (across 53 locations) for various heatwave definitions
| 97.5th percentile of temperature | 85th percentile of EHF (+) | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tmin | ATmin | Tmax | ATmax | Tmean | ATmean | Tmin | ATmin | Tmax | ATmax | Tmean | ATmean | |
| HW1 (na, SDb) | ||||||||||||
| 0 | 334.4 (3.7) | 334.4 (3.8) | 337.7 (4.3) | 338.2 (4.2) | 338.0 (4.0) | 337.0 (4.0) | 357.3 (1.5) | 357.5 (1.5) | 357.1 (1.8) | 357.1 (1.6) | 357.1 (1.9) | 357.4 (1.8) |
| 1 | 14.2 (3.4) | 14.3 (3.5) | 10.7 (3.4) | 10.3 (3.2) | 10.3 (3.2) | 11.6 (3.3) | 3.7 (1.4) | 3.8 (1.5) | 3.1 (1.3) | 3.3 (1.5) | 3.3 (1.6) | 3.3 (1.5) |
| 2 | 7.8 (2.0) | 8.0 (2.0) | 7.0 (2.2) | 7.2 (2.3) | 7.2 (2.2) | 7.4 (2.0) | 2.3 (0.9) | 2.0 (1.0) | 2.8 (1.2) | 2.6 (1.0) | 2.6 (1.2) | 2.4 (1.3) |
| 3 or more | 8.9 (1.5) | 8.5 (1.5) | 9.9 (2.0) | 9.6 (1.5) | 9.9 (1.6) | 9.3 (1.5) | 2.0 (0.6) | 2.0 (0.6) | 2.3 (1.0) | 2.3 (0.9) | 2.4 (0.9) | 2.2 (0.9) |
| HW2 (na, SDb) | ||||||||||||
| ≥ 2 consec. Days | 14.6 (1.8) | 14.6 (1.8) | 16.0 (2.0) | 16.1 (2.2) | 16.1 (2.4) | 15.4 (2.3) | 4.2 (0.9) | 4.0 (1.1) | 5.0 (1.1) | 4.8 (0.9) | 4.8 (1.1) | 4.5 (0.9) |
| ≥ 3 consec. Days | 6.9 (1.5) | 6.5 (1.6) | 8.7 (1.9) | 8.2 (1.5) | 8.4 (1.5) | 7.8 (1.5) | 1.9 (0.6) | 1.9 (0.6) | 2.3 (1.0) | 2.3 (0.9) | 2.3 (0.8) | 2.1 (0.9) |
| ≥ 4 consec. Days | 3.2 (1.2) | 3.2 (1.1) | 4.4 (1.6) | 4.2 (1.5) | 4.3 (1.5) | 3.8 (1.3) | 0.8 (0.4) | 0.8 (0.3) | 1.0 (0.4) | 1.2 (0.5) | 1.0 (0.5) | 0.9 (0.4) |
| HW3 | ||||||||||||
| na(SDb) | 3.3 (1.2) | 3.3 (1.1) | 4.5 (1.8) | 4.1 (1.5) | 4.3 (1.4) | 4.0 (1.2) | 0.9 (0.4) | 0.9 (0.5) | 1.2 (0.6) | 1.1 (0.6) | 1.0 (0.5) | 0.9 (0.5) |
| AUC (°C/°C2, mean (SDc)) | 0.52 (0.52) | 0.78 (0.81) | 0.76 (0.67) | 0.91 (0.78) | 0.57 (0.51) | 0.83 (0.80) | 1.2 (1.1) | 2.4 (2.3) | 3.7 (4.3) | 3.8 (4.1) | 1.4 (1.5) | 2.6 (2.7) |
Note: Excessive heat factor (EHF); HW1: the total number of hot days in the previous week (sum the number meeting the definition (ranging from 0 to 7)); HW2: number of consecutive hot days in the past week (binary indicators for 2, 3 and 4 consecutive days); HW3: area under the curve (AUC) during the previous week
a n is the mean annual number of days meeting the exposure definition across 53 locations
b Standard deviation (SD), describes the variation of number of days per year across 53 locations
c Standard deviation (SD), describes the variation of area under the curve (AUC) across 53 locations and all years