Description of elements in the header
m_tnnmonthly minimum temperature
m_tnndthe day with the monthly minimum temperature
m_tnathe monthly mean of the daily minimum temperatures
m_dtn0number of frost days with a minimum temperature of ≤ 0 °C
m_dtn10number of days with a minimum temperature of ≤ -10 °C
m_dtn20number of warm nights with a minimum temperature of ≥ 20 °C
1918.m_tnnm_tnndm_tnam_dtn0m_dtn10m_dtn20
January-10.21918-01-11-2.12110
February-7.61918-02-19-1.92100
March-8.41918-03-290.9900
April0.01918-04-018.1100
May7.01918-05-2711.4000
June5.71918-06-0512.2000
July11.01918-07-0316.0000
August11.41918-08-2115.4001
September8.21918-09-2212.8000
October3.51918-10-058.7000
November-5.51918-11-231.71600
December-9.61918-12-03-0.92200