Table 1 Climate and hydrologic variables for modified Jepson ecoregions in California

Precipitation (mm)

Mean

1,467

1,120

435

593

341

955

309

466

155

114

Change

−33.4

9.5

−1.7

28.2

24.5

15.6

23.4

2.5

13.6

12.9

% Change

−2%

1%

0%

5%

8%

2%

8%

1%

10%

13%

Minimum air temperature (°C)

Mean

6.0

3.2

0.4

7.9

9.7

3.8

1.0

9.0

10.5

14.8

Change

0.4

0.3

0.5

0.6

0.7

0.9

0.9

0.9

0.7

1.0

Maximum air temperature (°C)

Mean

18.9

17.1

15.4

21.9

24.4

17.3

16.7

22.9

25.4

30.0

Change

0.2

0.3

0.1

0.3

0.3

0.3

0.3

0.4

0.4

0.3

Potential evapotranspiration (mm)

Mean

1,042

1,055

1,018

1,279

1,365

1,179

1,194

1,381

1,470

1,523

Change

10.4

9.2

13.7

21.9

20.3

23.7

30.1

35.6

27.0

26.5

% Change

1%

1%

1%

2%

2%

2%

3%

3%

2%

2%

Recharge (mm)

Mean

504

174

42

103

40

219

49

59

4

1

Change

−24.2

−1.9

−1.0

4.0

4.5

0.4

5.9

−3.0

0.9

0.3

% Change

−5%

−1%

−2%

4%

13%

0%

14%

−5%

26%

35%

Runoff (mm)

Mean

492

507

87

120

11

319

61

80

3

5

Change

−22.3

7.3

2.4

11.9

2.5

7.3

8.8

−2.6

0.5

0.7

% Change

−4%

1%

3%

11%

30%

2%

17%

−3%

25%

17%

Climatic water deficit (mm)

Mean

558

535

575

863

1,065

638

778

1,011

1,293

1,339

Change

1.2

9.3

25.0

9.9

2.0

24.8

36.0

30.7

20.4

13.5

% Change

0%

2%

5%

1%

0%

4%

5%

3%

2%

1%

Snow water equivalent (mm)

Mean

85

227

91

1

0

241

102

12

0

0

Change

−33.0

−34.0

−16.0

0.0

0.0

−27.0

8.0

−2.0

0.0

0.0

% Change

39%

15%

18%

0%

0%

11%

−8%

17%

0%

0%