Time period

Mean

Min.

Max.

S.D.

Mean of Summer

S.D. of Summer

1983-1987

22.127

14.326 (Feb.)

28.948 (Jul.)

4.711

27.395

0.716

1987-1992

22.182

15.156 (Jan.)

28.281 (Jul.)

4.430

27.460

0.605

1993-1997

21.997

14.285 (Feb.)

28.064 (Jul.)

4.473

27.127

0.647

1998-2002

22.490

15.311 (Feb.)

28.261 (Aug.)

4.204

27.340

0.556

2002-2007

22.383

14.786 (Jan.)

28.929 (Jul.)

4.452

27.397

0.840

2008-2012

22.304

13.531 (Jan.)

28.220 (Jul.)

4.588

27.434

0.731