Last Spring Frost Date Shows Earlier Appearance in Poland: Analysis of Time Series Trends

For most stations, the analysis of trends in the time series of the last spring frost date at the height of 2 m showed a statistically significant trend indicating its earlier appearance. The trend calculated in this research study, ranging from 1.6 to 3.5 days per decade, and statistically significant changes confirm the previous results of research studies from the territory of Poland [7,23]. Any minor differences may result from the selection of the station or the methodology used.