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Table 1 Statistical description of the LTPP climatic data

From: Classification of pavement climatic regions through unsupervised and supervised machine learnings

Variables Definition Max. Min. Ave. Std.
MEAN_ANN_TEMP_AVG Average of daily mean air temperatures for a year (°C) 25.9 −4.1 13.3 4.7
MAX_ANN_TEMP_AVG Average of daily maximum air temperatures for a year (°C) 32.6 1.8 19.8 5.0
MIN_ANN_TEMP_AVG Average of daily minimum air temperatures for a year (°C) 22.1 −10 6.9 4.7
MAX_ANN_TEMP Absolute maximum air temperature for a year (°C) 52.2 21.4 37.1 3.3
MIN_ANN_TEMP Absolute minimum air temperature for year (°C) 10.1 − 69.1 −16.8 9.3
DAYS_ABOVE_32_C_YR Number of days when daily maximum air temperature was above 32.2 °C for a year 197 0 44.4 40.4
DAYS_BELOW_0_C_YR Number of days when daily minimum air temperature was below 0 °C for a year 271 0 94.6 56.0
FREEZE_INDEX_YR Sum of negative daily temperatures lower than 0 °C for a year 3369 0 252.3 326.4
FREEZE_THAW_YR Number of freeze–thaw cycles for year 236 0 74.2 41.0
MAX_ANN_HUM_AVG Average of daily maximum humidity for a year (%) 100 0 84.7 14.5
MIN_ANN_HUM_AVG Average of daily minimum humidity for a year (%) 84 0 44.7 11.0
TOTAL_ANN_PRECIP Total annual precipitation (mm) 3658.1 0 909.8 431.6
INTENSE_PRECIP_DAYS_YR Number of days precipitation was greater than 12.7 mm for a year 84 0 21.4 12.1
WET_DAYS_YR Number of days precipitation was greater than 0.25 mm for a year 261 0 124.3 40.8
TOTAL_SNOWFALL_YR Total snowfall for a year (mm) 10,674 0 525.4 693.2
SNOW_COVERED_DAYS_YR Number of days for which snow cover data were available for year 184 0 1.6 11.3