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Table 2 Weather conditions at 1400 hours on the days of the 2017 Knysna Fires, and the percentage of days that these (or more extreme) conditions occurred in the long-term record at George (since 1943) and Knysna (since 1997)

From: An assessment of climate, weather, and fuel factors influencing a large, destructive wildfire in the Knysna region, South Africa

2017 date Weather variables, fire danger, and drought indices Percentage of days that these (or worse) conditions occurred in the historic record
Rainfall (mm) Temp. (°C) Humidity (%) Wind (m s−1) FDI DF KBDI Temp. Humidity Wind FDI DF KBDI
George
 06 Jun 0.0 31.2 14 7.5 38.3 9.3 91.4 0.90 0.86 8.85 0.10 0.45 0.96
 07 Jun 0.0 18.6 30 13.8 24.5 9.3 91.8 56.08 5.78 0.19 0.84 0.45 0.96
 08 Jun 0.0 10.5 68 8.4 3.2 9.3 91.9 98.83 61.42 6.55 20.98 0.45 0.96
 09 Jun 0.0 15.9 41 3.9 6.7 9.3 92.2 81.62 13.17 49.25 9.35 0.45 0.78
 10 Jun 0.1 22.4 31 11.1 21.5 9.3 92.8 21.82 6.75 1.02 1.26 0.45 0.78
 11 Jun 0.0 18.4 48 4.8 6.2 9.3 93.2 56.08 21.60 34.00 9.35 0.45 0.78
Knysna
 06 Jun 0.0 34.1 11 2.1 32.0 10.0 149.7 0.76 0.08 59.08 0.05 0.91 0.53
 07 Jun 0.0 18.8 35 10.5 16.9 10.0 150.0 70.63 6.05 0.08 0.94 0.91 0.49
 08 Jun 3.4 11.4 67 5.7 2.6 8.9 150.0 99.43 66.46 5.15 38.60 8.19 0.49
 09 Jun 0.0 20.4 22 1.8 12.6 9.4 150.3 55.20 1.67 75.77 2.06 4.65 0.46
 10 Jun 0.0 23.3 29 4.5 14.6 10.0 150.7 32.68 3.70 11.35 1.39 0.91 0.45
 11 Jun 0.0 20.3 46 1.4 5.7 10.0 151.0 57.96 15.35 90.13 9.18 0.91 0.44
  1. Percentages ≤ 0.2 are in boldface to indicate extreme conditions. Temp. = temperature; FDI = McArthur Forest Fire Danger Index; DF = drought factor; and KBDI = Keetch Byram Drought Index (Keetch and Byram 1968; Noble et al. 1980)