Source

DF

Sum of Squares

Chi-Square

Pr > ChiSq

Spline (month)

4.30852

4.318683

38.1996

<0.0001

Spline (CO)

8.91396

22.019559

194.7672

<0.0001

Spline (o32)

6.03038

2.076251

18.3648

0.0055

Spline (humid)

3.15544

1.631258

14.4288

0.0028