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Temperature observations show increasing trend of maximum and minimum absolute temperature in between 1961 and 2022, reflecting a global warming. Number of hot days is increasing, including the frequency of extreme hot days with daily maximum temperature above 35 °C. In the summer of 2013, the highest temperature so far was measured in Slovenia, and local temperature records were observed at many meteorological stations. A record number of hot days was observed in 2022. Number of days with temperature below zero show a decline.


Charts

Figure PP07-1: Absolute maximum and minimum temperature in Slovenia, 1961-2022
Sources: 

ARSO Meteorological Data Archive, Slovenian Environment Agency, 2023

Show data

max. Kredarica[°C]

max. Rateče[°C]

max Murska Sobota[°C]

max. Novo mesto[°C]

max Ljubljana[°C]

max Portorož[°C]

min Kredarica[°C]

min Rateče[°C]

min Murska Sobota[°C]

min Novo mesto[°C]

min Ljubljana[°C]

min Portorož[°C]

1961

15.10

29.10

33.60

33.50

33.80

32.70

-24

-21.20

-21.80

-19.60

-14.80

-7.10

1962

16.50

30

32.60

33.60

33.40

34.30

-25.70

-18.60

-16.10

-16.30

-13.10

-6.50

1963

13.10

28.80

34

35.10

33.70

32

-28

-22.80

-30.40

-22.70

-19.80

-10

1964

15.80

28.50

31.30

32.10

32.10

33.60

-21.40

-19

-20.60

-16.20

-14.90

-6.80

1965

15.40

30.60

32

33.80

34.60

32.70

-23.20

-19.50

-18

-16.10

-11.10

-6.60

1966

16

29.50

30.70

30.50

31.20

31.70

-21.30

-19.50

-21.50

-16.90

-14.90

-10

1967

15.70

30.80

33.40

34.30

33.40

33.10

-22.10

-19.70

-22.90

-21.50

-13.30

-8.10

1968

16.40

30.60

37.30

36.30

35.20

35

-26.70

-24.10

-24.60

-22.60

-19.30

-11.60

1969

15.20

30.70

33.30

31.90

33.50

33.30

-23

-22.70

-26.80

-20.80

-16

-7.20

1970

16.70

29.40

31.90

32.60

33.10

34.50

-23

-21.70

-17.90

-18.20

-13.40

-7.60

1971

17.80

32.20

34.60

36.40

36.40

35.40

-28.20

-22.10

-17.70

-14.30

-14.30

-7.20

1972

17

29.40

32.60

32.60

33.10

34.90

-19

-14.90

-13.70

-10.80

-9.60

-5.50

1973

15.80

28.50

30.60

31.70

31.30

34.30

-23.90

-18.90

-17.20

-15.50

-15.30

-8.90

1974

16.30

30.80

32.60

32.90

33

32.50

-17.60

-12

-7.30

-7.40

-6

-4.80

1975

18.30

28.20

29.90

31.30

31.90

31.30

-20.60

-17.30

-10.70

-10.70

-9.20

-6

1976

14.60

30.20

32.40

32.70

33.90

32.80

-22.30

-19.80

-22

-15.80

-14.40

-6.40

1977

13.10

29

31.20

31.20

31.90

30.90

-19.50

-17.70

-15.60

-11.50

-7.70

-5.60

1978

14.10

26.80

29.60

31

29.50

32.10

-19.90

-21

-23.30

-16.80

-11.90

-7.30

1979

13.30

27.50

30.50

32.60

31.70

32

-27.80

-22.70

-19.70

-17

-14.10

-11.50

1980

17.10

28.70

31

31.60

32.70

34.40

-22.10

-19.60

-21.60

-17.20

-14.50

-8.20

1981

17.30

29.20

32.30

31.80

33.60

33.30

-25.10

-21.30

-21

-16.10

-14

-9.50

1982

16.10

28.90

31.80

31.80

32.70

31.50

-23.40

-18.80

-18.40

-12.30

-10.20

-8.60

1983

20.90

36.30

35.70

34.70

37

34.80

-23.10

-20

-16.90

-15.30

-13.80

-6.10

1984

17.50

32

31.30

33.60

33.20

31.80

-21.50

-19.90

-19

-13.70

-12.50

-7.30

1985

15.30

29.50

31.60

32.20

33

34.50

-28.30

-25.90

-25.90

-23.50

-19.90

-13.70

1986

13.60

29.90

32.50

32.50

32.60

34.20

-23

-21.80

-22.70

-17.20

-13

-7.50

1987

16.50

27.90

32.90

31.80

33.10

33.60

-24.20

-23.80

-26.80

-19.40

-17.90

-8.50

1988

15.70

29.90

34.60

34.40

34.80

34.30

-21.30

-19.40

-16.80

-15

-14

-5.30

1989

14.90

29.30

30.70

30.50

31.90

33.10

-17.60

-14.20

-13.20

-11.50

-10.70

-6.70

1990

15.70

28.60

32.20

33

33.30

35

-19.50

-14.40

-14

-13.40

-10.70

-4.50

1991

16.40

30.70

33

33.30

34.10

33.60

-25.70

-20.40

-17.10

-15.90

-14.40

-9.80

1992

17.70

33.30

37

36.20

36.40

34.70

-22.70

-15.60

-11.60

-12.20

-11.10

-5.70

1993

15.20

30.50

35

35.60

34.80

34.20

-25.20

-18

-17.20

-18.70

-12.40

-6.30

1994

16

31.80

33.90

34.70

34.60

35.80

-23

-17.60

-17.50

-14.10

-10.40

-7.70

1995

17.60

30.30

31.20

31.50

33.40

34.40

-20.90

-15.30

-19.50

-11.70

-9

-5.90

1996

14

29.40

32

32.10

33.30

34.40

-26.20

-20.80

-21.30

-17.50

-13.10

-8.90

1997

16.30

27.90

30.20

30

30.90

31.40

-18.30

-13.10

-13.70

-9.90

-9

-4.10

1998

17.40

32.50

33.40

33.70

34.10

36.50

-20

-16.70

-16.10

-14.30

-13.10

-6.10

1999

17

29.50

32.80

33

32.90

32.70

-24.90

-20.30

-16

-14.20

-11.90

-5.10

2000

17.80

31.10

37.80

36.90

35.10

34.90

-23.60

-20.20

-14.60

-16

-14.10

-10

2001

16.60

30.70

35.20

35.70

35.30

34.50

-24

-18.10

-22

-15.30

-14.60

-8.10

2002

16.50

31.50

33.80

34.30

35

33.90

-19.90

-18.70

-13.70

-13.10

-11

-6.70

2003

18.20

33.80

38.40

38.50

37.60

36.30

-21.30

-21.10

-21.60

-18.50

-16.90

-8.70

2004

16

31

33.40

33.10

34.30

34.90

-19.40

-20.70

-18.30

-15.40

-11.40

-8.70

2005

18.30

30.90

33.30

33.60

35.20

34.50

-26.20

-23.50

-23.70

-17.60

-14.50

-10.40

2006

17.30

32.30

33.20

34.90

36.10

35.90

-18.90

-21.70

-22.40

-16.50

-16.10

-8.80

2007

18

31.70

39

37.10

37.40

36.70

-18.10

-14.30

-8.20

-9.50

-6.60

-3.60

2008

15.90

30.60

33.40

33.10

32.80

33.60

-18.30

-16.90

-10.70

-9.90

-7.40

-6.30

2009

16.80

30.10

33.70

34.20

33

33.80

-22.80

-21.50

-21

-16.10

-13.20

-9.90

2010

16.20

31.40

33.70

36

35.90

35.50

-22

-18.80

-20.30

-15.10

-11.80

-7.40

2011

19.60

32.80

35.20

36.60

36.30

35.10

-19.50

-16.90

-10.40

-10.60

-7.20

-5.70

2012

18.80

32.60

37.30

37.80

37.30

36.80

-25.10

-17.80

-20.70

-16.90

-12.10

-8.10

2013

19

35.80

39.70

39.90

40.20

37.30

-19.80

-16.80

-15.50

-10.20

-6.80

-3.80

2014

15.50

30.90

34.40

33.60

36.40

33.60

-19.90

-14.20

-15.60

-14.20

-11.30

-2

2015

18.10

32.40

35.60

36.50

36.50

37.40

-19.40

-13.90

-11.70

-15.10

-9.50

-3.50

2016

17.30

30.20

32.90

34

33.80

34.50

-19.50

-13.10

-11.50

-10.30

-8.20

-4.60

2017

19.30

32.50

37.80

36.70

38.10

37.30

-24

-18.80

-16.30

-16.90

-13.40

-8.70

2018

17.40

31.80

33.50

33.40

34.80

35.40

-27.20

-21.10

-19.10

-17.20

-12.70

-5.90

2019

20.80

35.50

35.20

36.30

36.80

35.60

-18.40

-14.90

-11.20

-11.20

-8.30

-4.40

2020

18

31.80

32.90

34.20

33.40

34.80

-20.20

-12.70

-8.30

-7.50

-5.90

-2.20

2021

17.20

31

34.50

35.40

35.80

35.10

-24.10

-17.80

-10.20

-9.40

-7.50

-5.10

2022

17.60

32.80

36.40

37.80

38

37.20

-18.90

-17.70

-10.50

-7.90

-7.10

-4

Figure PP07-2: Number of hot days (with max temperature above 30 °C) in Slovenia, 1961-2022
Sources: 

ARSO Meteorological Data Archive, Slovenian Environment Agency, 2023

Show data

Kredarica[number of days]

Rateče[number of days]

Murska Sobota[number of days]

Novo mesto[number of days]

Ljubljana[number of days]

Portorož[number of days]

1961

0

0

9

8

11

14

1962

0

0

8

16

15

25

1963

0

0

15

15

14

14

1964

0

0

3

3

7

21

1965

0

1

3

9

9

8

1966

0

0

2

4

4

8

1967

0

1

13

14

18

19

1968

0

1

8

8

8

8

1969

0

1

5

7

6

21

1970

0

0

3

6

12

21

1971

0

1

12

12

18

30

1972

0

0

7

8

7

15

1973

0

0

2

5

8

25

1974

0

2

13

8

15

16

1975

0

0

0

2

3

4

1976

0

1

6

7

7

13

1977

0

0

1

2

3

2

1978

0

0

0

1

0

4

1979

0

0

5

9

5

18

1980

0

0

4

4

6

16

1981

0

0

4

7

6

9

1982

0

0

5

3

10

16

1983

0

8

13

11

17

29

1984

0

3

2

6

4

10

1985

0

0

8

8

15

28

1986

0

0

5

9

12

20

1987

0

0

9

10

8

16

1988

0

0

17

16

23

35

1989

0

0

4

3

7

10

1990

0

0

7

9

9

14

1991

0

1

10

9

15

32

1992

0

14

34

22

25

29

1993

0

1

24

25

20

24

1994

0

7

27

25

30

52

1995

0

1

6

6

14

21

1996

0

0

5

6

7

8

1997

0

0

1

0

4

11

1998

0

5

16

21

34

37

1999

0

0

8

13

13

18

2000

0

2

32

30

22

26

2001

0

3

26

30

31

35

2002

0

3

15

13

14

17

2003

0

13

52

56

55

68

2004

0

2

9

13

14

20

2005

0

3

14

15

16

21

2006

0

10

24

26

31

39

2007

0

5

28

25

24

34

2008

0

1

21

14

22

40

2009

0

1

13

23

26

38

2010

0

7

22

22

20

21

2011

0

7

23

28

29

28

2012

0

6

41

37

39

57

2013

0

16

29

29

35

43

2014

0

1

13

12

15

12

2015

0

11

40

40

43

51

2016

0

2

12

16

20

52

2017

0

6

33

46

42

45

2018

0

7

26

25

35

48

2019

0

10

34

34

37

57

2020

0

3

21

22

27

33

2021

0

5

27

37

39

45

2022

0

8

30

37

52

54

Figure PP07-3: Number of icing days (with max temperature below 0 °C) in Slovenia, 1961-2022
Sources: 

ARSO Meteorological Data Archive, Slovenian Environment Agency, 2023

Show data

Kredarica[number of days]

Rateče[number of days]

Murska Sobota[number of days]

Novo mesto[number of days]

Ljubljana[number of days]

Portorož[number of days]

1961

145

35

25

18

20

0

1962

197

48

33

30

28

1

1963

161

60

59

53

49

11

1964

180

42

33

34

29

0

1965

189

42

16

13

15

0

1966

170

33

21

18

23

0

1967

155

36

18

20

19

0

1968

170

43

34

26

28

1

1969

178

58

40

36

35

0

1970

181

43

25

21

22

0

1971

177

36

35

23

28

2

1972

190

49

32

30

22

0

1973

163

30

14

12

13

0

1974

203

8

1

2

1

0

1975

174

17

5

6

8

0

1976

179

43

26

22

16

0

1977

158

30

16

12

8

0

1978

177

42

24

23

17

0

1979

174

36

18

11

12

0

1980

179

53

31

20

21

0

1981

165

37

17

15

15

0

1982

161

28

28

26

20

0

1983

143

25

21

13

10

0

1984

182

38

19

17

12

0

1985

175

44

39

32

31

6

1986

163

45

42

35

33

0

1987

170

44

38

27

21

1

1988

154

16

10

6

11

0

1989

139

13

14

5

5

0

1990

132

28

18

16

16

0

1991

173

46

21

20

23

1

1992

137

21

11

14

14

0

1993

133

30

28

22

18

1

1994

141

17

14

12

5

0

1995

156

29

22

11

6

0

1996

169

38

46

42

39

3

1997

144

23

22

13

13

0

1998

153

28

19

21

17

0

1999

131

28

25

18

21

0

2000

130

18

18

11

13

0

2001

151

32

19

15

18

0

2002

129

20

22

18

14

0

2003

153

22

20

22

14

0

2004

152

30

17

13

13

0

2005

146

47

23

16

12

0

2006

135

27

25

14

15

0

2007

126

9

15

17

11

0

2008

153

15

10

8

8

0

2009

154

33

20

20

21

1

2010

169

56

29

22

25

0

2011

122

23

24

19

13

0

2012

130

34

19

20

20

6

2013

146

24

14

12

10

0

2014

115

14

13

10

6

0

2015

112

11

7

5

2

0

2016

149

7

17

14

11

0

2017

132

28

25

19

20

0

2018

113

26

13

11

7

2

2019

147

13

4

3

1

0

2020

100

10

7

3

0

0

2021

148

28

4

3

5

0

2022

122

13

4

2

2

0

Figure PP07-4: Projected change in number of hot days (with max temperature above 30 °C) in Slovenia and associated reliability of change (2011-2040)
Sources: 

Source: Assessment of climate changes in Slovenia by the end of the 21st century, 2018

Figure PP07-5: Projected change in number of frost and icing days in Slovenia and associated reliability of change (2011-2040)
Sources: 

Assessment of climate changes in Slovenia by the end of the 21st century, 2018


Goals

  • to monitor and analyse the data on extreme weather events;
  • to mitigate the adverse effects and sensitivity caused by extreme weather events;
  • to incorporate adjustment mechanisms into development plans.

Other sources and literature

  1. Agencija RS za okolje, Naše okolje, mesečni bilten ARSO.
  2. Agencija RS za okolje, Izredni dogodki (16. 6. 2023).
  3. Svetovna meteorološka organizacija, 2013. The global climate 2001-2010, Decade of climate extremes.
  4. Svetovna meteorološka organizacija, 2023. State of the Global Climate 2022.
  5. Zakon o državni meteorološki, hidrološki, oceanografski in seizmološki službi (ZDMHS) (Uradni list RS, št. 60/17)
  6. Agencija RS za okolje, 2018. Ocena podnebnih sprememb v Sloveniji do konca 21. stoletja. Ljubljana, november 2018.
  7. Agencija RS za okolje, 2022. Slovenski vremenski rekordi.


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