The effect of air temperature on variability of phenophase dates and the length of spring triticale interphases was investigated by means of simple linear regression analysis. An increase in the mean temperature in Poland observed in 1965-2004, the biggest for the mean temperature in August (+0.53oC/10 years, P<0.01) and April (+0.50oC/10 years, P<0.01), caused significant, with P<0.01, acceleration of phenophase dates. The bigger the size of changes, the later the phenophase it concerned – for beginning of tillering the average acceleration of the date amounted to +1.8 day/10 years, for beginning of shooting +3,4 day/10 years, for beginning of heading +4.2 days /10 years, and for wax maturity as many as +10.2 days /10 years. The duration of periods of emergence-tillering and tillering-shooting in 1984-2004 became shortened by, respectively, -1.0 day/10 years and –1.5 day/10 years, and the period of heading-wax maturity by –5.9 day/10 years. On the basis of the generalized method of cluster analysis it was determined that the biggest yields of spring triticale crops can be obtained with earlier than average dates from sowing to beginning of heading, and close to average dates of wax maturity and harvesting, and also longer than average interphases: sowing-emergence, emergence-tillering, shooting-heading and periods: sowing-wax maturity and sowing-harvesting, and with close to average duration of periods: heading-wax maturity and wax maturity-harvesting.