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Table 3 Correlations between mean monthly meteorological factors and tree pollen counts

From: Impact of meteorological variation on hospital visits of patients with tree pollen allergy

Month Meteorological factors Counts of tree pollen (grains/m3)
   March April May
February Average temperature (°C) 0.04 -0.16 0.22
  Maximum temperature (°C) 0.08 -0.08 0.15
  Minimum temperature (°C) -0.02 -0.27 0.25
  Relative humidity (%) 0.24 -0.02 0.16
  Precipitation (mm) 0.06 -0.04 0.82*
March Average temperature (°C) 0.50 0.62 -0.10
  Maximum temperature (°C) 0.17 0.43 -0.37
  Minimum temperature (°C) 0.78* 0.86* 0.16
  Relative humidity (%) 0.85* 0.65 0.13
  Precipitation (mm) 0.50 0.24 -0.11
April Average temperature (°C) - 0.48 0.11
  Maximum temperature (°C) - 0.45 -0.11
  Minimum temperature (°C) - 0.34 0.44
  Relative humidity (%) - 0.24 0.07
  Precipitation (mm) - 0.01 0.68
May Average temperature (°C) - - 0.72*
  Maximum temperature (°C) - - 0.64
  Minimum temperature (°C) - - 0.61
  Relative humidity (%) - - -0.47
  Precipitation (mm) - - -0.03
  1. Data are Pearson's correlation coefficients. *P < 0.05