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
1997.m_tnnm_tnndm_tnam_dtn0m_dtn10m_dtn20
January-14.41997-01-01-4.23040
February-11.71997-02-03-2.21920
March-5.41997-03-24-0.82200
April-6.31997-04-141.81200
May5.01997-05-2610.4000
June4.11997-06-0113.3001
July10.71997-07-1414.7000
August10.51997-08-2314.1000
September2.11997-09-218.8000
October-8.31997-10-302.31300
November-5.91997-11-212.9900
December-10.71997-12-17-0.31610