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
1939.m_tnnm_tnndm_tnam_dtn0m_dtn10m_dtn20
January-14.81939-01-02-2.21840
February-6.01939-02-04-1.31700
March-5.01939-03-16-0.11800
April1.91939-04-037.7000
May8.01939-05-2511.3000
June9.31939-06-0615.1000
July9.21939-07-2616.4003
August13.31939-08-3116.3002
September1.61939-09-2911.5000
October0.61939-10-107.0000
November-1.51939-11-233.2400
December-15.11939-12-31-2.22040