Dfa: D = Snow f = Fully humid a = Hot summer
Hot-summer humid continental climate; coldest month averaging below 0 °C, at least one month's average temperature above 22 °C, and at least four months averaging above 10 °C. No significant precipitation difference between seasons.
Examples of airports with a Dfa climate include St Louis/Lambert, Illinois, USA, Kherson, Ukraine, and New Chitose Airport, Japan
Köppen–Geiger climate classification map for Humid continental climates: Hot summer subtype (Dfa, Dwa, Dsa) - source: wikicommons, authors: Beck, H.E., Zimmermann, N. E., McVicar, T. R., Vergopolan, N., Berg, A., & Wood, E. F., 2018
Flight safety and planning considerations
Snow fall and risk of runway contamination and airframe icing in winter months. Performance limitations in high summer temperatures.