Fig. 1

Fig. 2

Fig. 3

Fig. 4
![Mean SLP [in hPa] (colour scale) and z500 hPa [in gpm] (dotted line) (A) anomalies of SLP [in hPa] (colour scale) and z500 hPa [in m] (dotted line) (B) and anomalies of T850 [in °C] (C) for days with very strong and extreme cold stress. SLP, sea level pressure.](https://sciendo-parsed.s3.eu-central-1.amazonaws.com/647351144e662f30ba539ed7/j_quageo-2022-0028_fig_004.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Credential=ASIA6AP2G7AKHNQVPCAB%2F20260221%2Feu-central-1%2Fs3%2Faws4_request&X-Amz-Date=20260221T095827Z&X-Amz-Expires=3600&X-Amz-Security-Token=IQoJb3JpZ2luX2VjEN3%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaDGV1LWNlbnRyYWwtMSJIMEYCIQC2eYZJ8AFzk72f%2BFNzGyHjnV1QkAsv1ARMscwoY2iydwIhAKcAuJoDNfFD2OOiFMV8s82LlkN8xDlZcqSrA5GIV2YIKsUFCKb%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEQAhoMOTYzMTM0Mjg5OTQwIgz9yubB7%2B8kTqmb2W0qmQUv4uS3WzTnSGGoMY2tfmkCq%2F3fjK8eY94wE90%2BaMu3SCaXTigeRsEcPN3P4AqcAE7jEXUuXRtUNilvUsohKyiVqD7yWqZbfwSCRP%2FEMPtYy%2F9KOmKxEIa%2BtRqqHnP9WHnbFz3lyCtK33jpq4sb0rAE5s%2Fp2PHu9dpb833mMgIcsodi9Co4UXRZSG61dP0KNqbjmayF3s4mrZ58%2BXL9boe4851Rj1yEqlcySLX%2FUU2nT6W%2B42hdtuC0XfcP2N%2FZ51UV3kzlgjdF9A9nwDVSrBWOd3GcaV63qbmS%2BzfxQZgL2q8%2BIruYwLHNfYIl5Nq52QtCLW1JUgSsrrX0zZK4uz8klJn2N0FdbNFGFCjWnIVuuz61ROR2VsbO1dL0CBvna1Zx3qSGzwxVYgOOtAaM1K4G8%2BdHdIPdvpM3JrU%2Bfpzw4q8ju8gS%2F5PcPJbPdNEkQqnOzHI51GQmMc4QannD0FJN5Tzjl%2Bev2W0dcinYXigIcf7x7WBBv0t1N1zm7RjH6Ld8pOT8dS5vqeS3UJLnVYOCzpncHcyvd4m1dZurCZmcYXe0KII%2FNtc8I4U8rFYSERV%2F7A%2F3zB3ZWe2okYSEZ%2FWDTJcmqQcVo%2FdOujRdCmQU2%2BPI3DIhulkrfgX%2BeCMGk1xv7QPlAnVnx6RCnCyBY0Gv4VY62z5ztzG8uh%2Bh0Jgj3lB6LTJTbbn8xFTGcL%2BdlUGjcyBLkolu701AniyWNko8U8uNBpPAMCeGXTSLKAc4r8RfIybYyfz%2BqS%2FR25kio8l724LYC6T5XGtS%2B0mj0lvsNWQBTDNy2d%2Bw4%2BhiKtylMC9kH6Kb82xxl7BqLj5DFwR%2BIbdS4JAckKdwZWKTLLqj%2F8zjOMTu5pNXyJXKq%2FCh0BhmPMGtOFS6bzDB9uTMBjqwAefpZI3K8ClSUWGKEsTUCRAAUt29y5rmLepUL9jIjYxItrtNaF%2BstsCrjatgveLxs3zWlJwM4jkTzfGRgFGcMpK3nnu6zH%2FHN61VbKkTF2fgdTV48iSeJO2L1t3CEGohNl0d%2BhqeNrCaiUnxm3pcNvjoUHowO7aqaQ5gE4Uj1RdAMto4VdQ1nHSYRpLJw4jREzvQWfSEghos%2BMyUlZ%2Fo4wrGJRAKVXtyxEN6yCLatHo0&X-Amz-Signature=44426acc51ed11d5ccd07be4ff0a75eaf785386f42c315300f20417199610562&X-Amz-SignedHeaders=host&x-amz-checksum-mode=ENABLED&x-id=GetObject)
Fig. 5
![Mean SLP [in hPa] (colour scale) and z500 hPa [in gpm] (dotted line) (left column); SLP [in hPa] (colour scale) and z500 hPa anomalies [in m] (dotted line) (middle column); and anomalies of T850 [in °C] (right column) for the designated circulation types. SLP, sea level pressure.](https://sciendo-parsed.s3.eu-central-1.amazonaws.com/647351144e662f30ba539ed7/j_quageo-2022-0028_fig_005.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Credential=ASIA6AP2G7AKHNQVPCAB%2F20260221%2Feu-central-1%2Fs3%2Faws4_request&X-Amz-Date=20260221T095827Z&X-Amz-Expires=3600&X-Amz-Security-Token=IQoJb3JpZ2luX2VjEN3%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaDGV1LWNlbnRyYWwtMSJIMEYCIQC2eYZJ8AFzk72f%2BFNzGyHjnV1QkAsv1ARMscwoY2iydwIhAKcAuJoDNfFD2OOiFMV8s82LlkN8xDlZcqSrA5GIV2YIKsUFCKb%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEQAhoMOTYzMTM0Mjg5OTQwIgz9yubB7%2B8kTqmb2W0qmQUv4uS3WzTnSGGoMY2tfmkCq%2F3fjK8eY94wE90%2BaMu3SCaXTigeRsEcPN3P4AqcAE7jEXUuXRtUNilvUsohKyiVqD7yWqZbfwSCRP%2FEMPtYy%2F9KOmKxEIa%2BtRqqHnP9WHnbFz3lyCtK33jpq4sb0rAE5s%2Fp2PHu9dpb833mMgIcsodi9Co4UXRZSG61dP0KNqbjmayF3s4mrZ58%2BXL9boe4851Rj1yEqlcySLX%2FUU2nT6W%2B42hdtuC0XfcP2N%2FZ51UV3kzlgjdF9A9nwDVSrBWOd3GcaV63qbmS%2BzfxQZgL2q8%2BIruYwLHNfYIl5Nq52QtCLW1JUgSsrrX0zZK4uz8klJn2N0FdbNFGFCjWnIVuuz61ROR2VsbO1dL0CBvna1Zx3qSGzwxVYgOOtAaM1K4G8%2BdHdIPdvpM3JrU%2Bfpzw4q8ju8gS%2F5PcPJbPdNEkQqnOzHI51GQmMc4QannD0FJN5Tzjl%2Bev2W0dcinYXigIcf7x7WBBv0t1N1zm7RjH6Ld8pOT8dS5vqeS3UJLnVYOCzpncHcyvd4m1dZurCZmcYXe0KII%2FNtc8I4U8rFYSERV%2F7A%2F3zB3ZWe2okYSEZ%2FWDTJcmqQcVo%2FdOujRdCmQU2%2BPI3DIhulkrfgX%2BeCMGk1xv7QPlAnVnx6RCnCyBY0Gv4VY62z5ztzG8uh%2Bh0Jgj3lB6LTJTbbn8xFTGcL%2BdlUGjcyBLkolu701AniyWNko8U8uNBpPAMCeGXTSLKAc4r8RfIybYyfz%2BqS%2FR25kio8l724LYC6T5XGtS%2B0mj0lvsNWQBTDNy2d%2Bw4%2BhiKtylMC9kH6Kb82xxl7BqLj5DFwR%2BIbdS4JAckKdwZWKTLLqj%2F8zjOMTu5pNXyJXKq%2FCh0BhmPMGtOFS6bzDB9uTMBjqwAefpZI3K8ClSUWGKEsTUCRAAUt29y5rmLepUL9jIjYxItrtNaF%2BstsCrjatgveLxs3zWlJwM4jkTzfGRgFGcMpK3nnu6zH%2FHN61VbKkTF2fgdTV48iSeJO2L1t3CEGohNl0d%2BhqeNrCaiUnxm3pcNvjoUHowO7aqaQ5gE4Uj1RdAMto4VdQ1nHSYRpLJw4jREzvQWfSEghos%2BMyUlZ%2Fo4wrGJRAKVXtyxEN6yCLatHo0&X-Amz-Signature=3e8490669d306aba07d39bb8aee65fbb5c0ccc93a8e4b575594103811dae125f&X-Amz-SignedHeaders=host&x-amz-checksum-mode=ENABLED&x-id=GetObject)
Fig. 6

Fig. 7
![Mean SLP [in hPa] (colour scale) and z500 hPa [in gpm] (dotted line) (top row); SLP [in hPa] (colour scale) and z500 hPa anomalies [in m] (dotted line) (middle row); and anomalies of T850 [in °C] (bottom row) for the selected days. SLP, sea level pressure.](https://sciendo-parsed.s3.eu-central-1.amazonaws.com/647351144e662f30ba539ed7/j_quageo-2022-0028_fig_007.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Credential=ASIA6AP2G7AKHNQVPCAB%2F20260221%2Feu-central-1%2Fs3%2Faws4_request&X-Amz-Date=20260221T095827Z&X-Amz-Expires=3600&X-Amz-Security-Token=IQoJb3JpZ2luX2VjEN3%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaDGV1LWNlbnRyYWwtMSJIMEYCIQC2eYZJ8AFzk72f%2BFNzGyHjnV1QkAsv1ARMscwoY2iydwIhAKcAuJoDNfFD2OOiFMV8s82LlkN8xDlZcqSrA5GIV2YIKsUFCKb%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEQAhoMOTYzMTM0Mjg5OTQwIgz9yubB7%2B8kTqmb2W0qmQUv4uS3WzTnSGGoMY2tfmkCq%2F3fjK8eY94wE90%2BaMu3SCaXTigeRsEcPN3P4AqcAE7jEXUuXRtUNilvUsohKyiVqD7yWqZbfwSCRP%2FEMPtYy%2F9KOmKxEIa%2BtRqqHnP9WHnbFz3lyCtK33jpq4sb0rAE5s%2Fp2PHu9dpb833mMgIcsodi9Co4UXRZSG61dP0KNqbjmayF3s4mrZ58%2BXL9boe4851Rj1yEqlcySLX%2FUU2nT6W%2B42hdtuC0XfcP2N%2FZ51UV3kzlgjdF9A9nwDVSrBWOd3GcaV63qbmS%2BzfxQZgL2q8%2BIruYwLHNfYIl5Nq52QtCLW1JUgSsrrX0zZK4uz8klJn2N0FdbNFGFCjWnIVuuz61ROR2VsbO1dL0CBvna1Zx3qSGzwxVYgOOtAaM1K4G8%2BdHdIPdvpM3JrU%2Bfpzw4q8ju8gS%2F5PcPJbPdNEkQqnOzHI51GQmMc4QannD0FJN5Tzjl%2Bev2W0dcinYXigIcf7x7WBBv0t1N1zm7RjH6Ld8pOT8dS5vqeS3UJLnVYOCzpncHcyvd4m1dZurCZmcYXe0KII%2FNtc8I4U8rFYSERV%2F7A%2F3zB3ZWe2okYSEZ%2FWDTJcmqQcVo%2FdOujRdCmQU2%2BPI3DIhulkrfgX%2BeCMGk1xv7QPlAnVnx6RCnCyBY0Gv4VY62z5ztzG8uh%2Bh0Jgj3lB6LTJTbbn8xFTGcL%2BdlUGjcyBLkolu701AniyWNko8U8uNBpPAMCeGXTSLKAc4r8RfIybYyfz%2BqS%2FR25kio8l724LYC6T5XGtS%2B0mj0lvsNWQBTDNy2d%2Bw4%2BhiKtylMC9kH6Kb82xxl7BqLj5DFwR%2BIbdS4JAckKdwZWKTLLqj%2F8zjOMTu5pNXyJXKq%2FCh0BhmPMGtOFS6bzDB9uTMBjqwAefpZI3K8ClSUWGKEsTUCRAAUt29y5rmLepUL9jIjYxItrtNaF%2BstsCrjatgveLxs3zWlJwM4jkTzfGRgFGcMpK3nnu6zH%2FHN61VbKkTF2fgdTV48iSeJO2L1t3CEGohNl0d%2BhqeNrCaiUnxm3pcNvjoUHowO7aqaQ5gE4Uj1RdAMto4VdQ1nHSYRpLJw4jREzvQWfSEghos%2BMyUlZ%2Fo4wrGJRAKVXtyxEN6yCLatHo0&X-Amz-Signature=02b1bf4dbd50ffa24ef1f377df0270625ead0033405d88286cd99941414bac2e&X-Amz-SignedHeaders=host&x-amz-checksum-mode=ENABLED&x-id=GetObject)
Selected characteristics of the number of days with very strong and extreme cold stress according to UTCI in Poland, 1966/67 to 2018/19: their maximum number and trend coefficient_ Statistically significant (at 0_05 level) trend values are in bold_
| Station | Maximum number of days and season of their occurrence | Trend (days· decade−1) |
|---|---|---|
| Białystok | 42 1971/72 | −3.53 |
| Bielsko-Biała | 17 1967/68 | −0.91 |
| Borucino | 48 1969/70 | −2.33 |
| Chojnice | 7 1978/79 1986/87 | 0.00 |
| Elbląg | 19 1969/70 | −0.34 |
| Gdańsk | 15 1978/79 | 0.00 |
| Gorzów Wlkp. | 13 1978/79 | −0.57 |
| Hel | 16 1978/79 | −0.29 |
| Jelenia Góra | 10 1975/76 | −0.36 |
| Kalisz | 15 1986/87 | 0.00 |
| Katowice | 6 1978/79 | −0.31 |
| Kielce | 12 1984/85 | −0.24 |
| Kłodzko | 9 1969/70, 1977/78, 1983/84, 1984/85 | −0.34 |
| Kołobrzeg | 8 1978/79 | −0.53 |
| Koszalin | 9 1978/79 | −0.59 |
| Kraków | 14 1968/69 | 0.00 |
| Lesko | 15 1978/79 | −1.43 |
| Lublin | 13 1986/87 | 0.00 |
| Łeba | 19 1978/79 1986/87 | 0.00 |
| Łódź | 16 1969/70 | −0.99 |
| Mikołajki | 47 1971/72 | −4.62 |
| Mława | 28 1971/72 | −1.67 |
| Olsztyn | 12 1969/70 | 0.00 |
| Opole | 5 1978/79 | −0.31 |
| Poznań | 14 1978/79 | −0.49 |
| Racibórz | 10 1986/87 | 0.00 |
| Rzeszów | 21 1968/69 | −0.35 |
| Siedlce | 17 1986/87 | −0.81 |
| Słubice | 6 1978/79 | −0.29 |
| Suwałki | 34 1978/79 | −4.00 |
| Świnoujście | 16 1986/87 | −0.53 |
| Szczecin | 11 1978/79 | 0.00 |
| Terespol | 20 1968/69 | −0.59 |
| Toruń | 9 1978/79 | −0.53 |
| Ustka | 10 2010/11 | 0.00 |
| Warszawa | 19 1969/70, 1986/87 | −0.67 |
| Włodawa | 21 1978/79 | −0.48 |
| Wrocław | 9 1978/79 | −0.38 |
| Zakopane | 4 1967/68 | −0.18 |
| Zielona Góra | 9 1978/79 | −0.33 |