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10
imumvaluesof-17.1OC,-22.2OCand-18.6OC,
respectively.Tevaluesofstandarddeviation
fortheindividualmonthsalsoprovedthat
thermaldiversityatnoonwashigherduring
thewinter-springperiodcomparedtosummer
(Table2).
Ananalysisofairtemperatureathours
aroundnoonintheconsecutivedecadesindi-
catesanoticeablewarmingatthebeginning
ofthe21stcentury(Table3).Inallstations,
theyears2011-2018werethewarmestof
thewholeanalysedperiod,bothconsidering
annualvaluesandindividualseasons;the
greatestincreaseinaverageannualairtem-
peraturebetweenthe1950sandtheyears
MonikaOkoniewska
2011-2018tookplaceinKraków,withthe
smallestoneinPoznań.Testudyindicates
thatonaveragealmosteachsubsequent
decadeofthe1951-2018periodwaswarmer
thantheonebefore.Tedińerencebetween
thesecondtolastdecadeandtheyears2011-
2018wasbetween0.6and0.8OC,whichissig-
nificantlygreaterthandińerencesbetweenthe
precedingdecades.Anexceptionoccurredin
the1960s,whentheaverageannualvaluesof
airtemperatureinallstationswerelowerthan
intheprecedingdecade.Asfarasseasonsof
theyearareconcerned,thetrendofairtem-
peratureincreasewasnotthatunambiguous.
Testudyrevealsthatnotonlythe1960s,but
Table3.Teaveragemonthly,seasonalandannualvaluesofairtemperature[OC]at12p.m.UTCintheconsecu-
tivedecades(Author’sowncalculationbasedonIMGWdataobtainedfromhttps://dane.imgw.pl/data/dane_po-
miarowo_obserwacyjne)
January
February
March
April
May
June
July
August
September
October
November
December
spring
summer
autumn
winter
year
1951-1960
1961-1970
1971-1980
1981-1990
1991-2000
2001-2010
2011-2018
1951-1960
1961-1970
1971-1980
1981-1990
1991-2000
2001-2010
2011-2018
1951-1960
1961-1970
1971-1980
1981-1990
1991-2000
2001-2010
2011-2018
Kołobrzeg
0.4
-0.23.4
7.5
11.615.918.519.016.211.65.6
2.6
10.418.17.8
0.9
9.4
-0.70.3
3.4
8.0
11.816.518.418.316.912.25.8
0.3
10.718.17.8
0.2
9.3
0.2
1.7
4.5
7.3
12.516.518.419.415.810.85.8
2.6
10.818.37.5
1.7
9.7
0.7
1.5
5.2
8.4
13.916.619.219.615.912.45.8
2.2
11.818.58.0
1.9
10.2
1.9
2.6
5.4
9.8
13.117.019.420.116.211.55.2
2.1
12.018.87.7
2.7
10.4
1.1
2.3
5.1
9.7
13.917.220.720.417.111.86.7
2.1
12.319.78.3
2.2
10.7
1.5
2.3
5.5
9.9
14.817.820.221.017.712.57.3
4.2
12.819.99.0
2.9
11.3
Poznań
-0.4-0.44.6
10.816.620.722.021.617.712.25.3
1.9
14.620.97.8
0.6
11.1
-1.90.1
4.2
11.716.021.321.721.018.312.55.6
-0.814.620.87.6
-0.210.8
-0.51.5
5.9
10.216.620.020.921.416.610.75.2
1.8
14.220.37.1
1.5
10.9
0.0
1.0
6.1
11.317.819.121.721.516.912.65.2
1.5
14.920.57.7
1.6
11.3
1.3
2.5
6.3
12.717.420.122.422.517.211.84.8
1.4
15.321.07.6
2.5
11.7
0.1
2.2
6.3
13.318.221.123.923.018.312.06.4
1.0
16.022.38.1
1.9
12.2
0.9
1.9
7.1
13.618.921.223.423.719.112.96.9
3.7
16.622.49.0
2.8
12.8
Kraków
-0.20.1
4.9
11.416.720.722.722.317.912.75.7
2.6
14.921.58.3
0.8
11.5
-2.40.4
4.6
12.917.021.222.021.618.913.66.7
-0.715.321.58.4
-0.211.4
-0.12.4
7.4
11.517.520.321.622.017.612.16.1
2.2
15.220.98.1
2.3
11.8
0.4
1.6
7.2
12.919.020.422822.918.514.26.0
2.2
16.321.78.9
2.1
12.4
1.3
3.1
6.9
13.218.621.723.323.518.112.95.8
1.1
16.322.08.4
2.7
12.5
0.5
2.5
7.3
14.219.221.824.523.918.713.37.4
1.3
16.922.98.9
2.4
12.9
1.4
2.6
8.2
15.119.522.624.424.919.713.77.8
4.0
17.723.49.8
3.4
13.7
