HadISDH.extremes Decadal Trends from version 1.2.0.2024f

Trends are calculated using Ordinary Least Squares regression. Gridboxes with borders are where trends are considered to be significant because both the 90pct confidence intervals are of the same sign (positive or negative). These have been calculated with AR(1) correction following Santer et al., 2008. The dark grey coverage across the right-hand-side of panel b) shows the proportion of land at that latitude band. The light grey coverage shows the proportion of that land that has observations available.

1973 to 2024	1973 to 1999	2000 to 2024
Monthly maximum of daily maximum wet bulb temperature (TwX) anomaly (1991-2020)
Monthly minimum of daily minimum wet bulb temperature (TwN) anomaly (1991-2020)
Percentage of days per month exceeding 90th percentile of climatological daily maximum wet bulb temperature (TwX90p) anomaly (1991-2020)
Percentage of days per month exceeding 90th percentile of climatological daily mean wet bulb temperature (TwM90p) anomaly (1991-2020)
Percentage of days per month exceeding 10th percentile of climatological daily mean wet bulb temperature (TwM10p) anomaly (1991-2020)
Percentage of days per month exceeding 10th percentile of climatological daily minimum wet bulb temperature (TwN10p) anomaly (1991-2020)
Percentage of days per month equal or exceeding 25 °C maximum wet bulb temperature (TwX25) anomaly (1991-2020)
Percentage of days per month equal or exceeding 27 °C maximum wet bulb temperature (TwX27) anomaly (1991-2020)
Percentage of days per month equal or exceeding 29 °C maximum wet bulb temperature (TwX29) anomaly (1991-2020)
Percentage of days per month equal or exceeding 31 °C maximum wet bulb temperature (TwX31) anomaly (1991-2020)
Percentage of days per month equal or exceeding 33 °C maximum wet bulb temperature (TwX33) anomaly (1991-2020)
Percentage of days per month equal or exceeding 35 °C maximum wet bulb temperature (TwX35) anomaly (1991-2020)
Monthly maximum of daily maximum dry bulb temperature (TX) anomaly (1991-2020)
Monthly minimum of daily minimum dry bulb temperature (TN) anomaly (1991-2020)
Percentage of days per month exceeding 90th percentile of climatological daily maximum dry bulb temperature (TX90p) anomaly (1991-2020)
Percentage of days per month exceeding 90th percentile of climatological daily mean dry bulb temperature (TM90p) anomaly (1991-2020)
Percentage of days per month exceeding 10th percentile of climatological daily mean dry bulb temperature (TM10p) anomaly (1991-2020)
Percentage of days per month exceeding 10th percentile of climatological daily minimum dry bulb temperature (TN10p) anomaly (1991-2020)
Percentage of days per month equal or exceeding 25 °C maximum dry bulb temperature (TX25) anomaly (1991-2020)
Percentage of days per month equal or exceeding 30 °C maximum dry bulb temperature (TX30) anomaly (1991-2020)
Percentage of days per month equal or exceeding 35 °C maximum dry bulb temperature (TX35) anomaly (1991-2020)
Percentage of days per month equal or exceeding 40 °C maximum dry bulb temperature (TX40) anomaly (1991-2020)
Percentage of days per month equal or exceeding 45 °C maximum dry bulb temperature (TX45) anomaly (1991-2020)
Percentage of days per month equal or exceeding 50 °C maximum dry bulb temperature (TX50) anomaly (1991-2020)

Maintained by: Kate Willett Last updated: 21/03/2025 Hosted by: Met Office Hadley Centre

© Crown Copyright