Measuring Heatwaves and Their Impacts, Table 1 (continued)
Index
Description
Max.
temperature
Min.
temperature
Relative
humidity Other
Intensity
output
Reference
energy balance
models
TX90pct
A maximum
temperature
threshold based
on the 90th
percentile of
calendar day
temperatures
with a 15-day
window
X
Perkins et al.
[8]
TN90pct
A minimum
temperature
threshold based
on the 90th
percentile of
calendar day
temperatures
with a 15-day
window
X
Perkins et al.
[8]
Universal
thermal climate
index (UTCI)
Predictor for
human thermal
comfort based
on air
temperature,
relative
humidity, wind
speed (at 10 m
above ground),
and mean
radiant
temperature
(which can be
derived from
globe
temperature)
X
Lam et al.
[29]
HWD1/hot
days
The daily
maximum
temperature
above 35
C
(about top 1%)
for 3 or more
consecutive
days
X
Hansen et al.
[30], Collins
et al. [31]
Hot nights
Nights with a
minimum
temperature
equal to, or
above, 20
C
X
Collins et al.
[31]
Relatively
warm days
Days with a
maximum
temperature in
the upper 95th
percentile
X
Collins et al.
[31]
(continued)
Measuring Heatwaves and Their Impacts
461