Month

Cubic Equation

R²

Jan

0.534 + 0.0021 T_a–7.924 × 10⁻⁰⁸ ${\text{T}}_{\text{a}}^2$ − 4.226 × 10⁻¹⁰ ${\text{T}}_{\text{a}}^3$

0.966

Feb

3.436 + 0.0008 T_a + 2.983 × 10⁻⁰⁶ ${\text{T}}_{\text{a}}^2$ − 3.765 × 10⁻¹² ${\text{T}}_{\text{a}}^3$

0.958

Mar

22.138 − 0.005 T_a + 3.256 × 10⁻⁰⁷ ${\text{T}}_{\text{a}}^2$ − 5.234 × 10⁻¹¹ ${\text{T}}_{\text{a}}^3$

0.953

Apr

10.705 + 0.02063 T_a − 4.912 × 10⁻⁰⁷ ${\text{T}}_{\text{a}}^2$ + 2.082 × 10⁻¹¹ ${\text{T}}_{\text{a}}^3$

0.943

May

7.259 − 0.0025 T_a + 6.123 × 10⁻⁰⁶ ${\text{T}}_{\text{a}}^2$ − 3.882 × 10⁻¹¹ ${\text{T}}_{\text{a}}^3$

0.967

Jun

8.224 − 0.654 T_a + 5.231 × 10⁻⁰⁶ ${\text{T}}_{\text{a}}^2$ − 4.721 × 10⁻⁸ ${\text{T}}_{\text{a}}^3$

0.958

Jul

221.213 + 0.138 T_a − 3.524 × 10⁻⁰⁵ ${\text{T}}_{\text{a}}^2$ + 3.921 × 10⁻¹¹ ${\text{T}}_{\text{a}}^3$

0.974

Aug

215.532 + 0.179 T_a − 3.339 × 10⁻⁰⁷ ${\text{T}}_{\text{a}}^2$ + 6.981 × 10⁻⁹ ${\text{T}}_{\text{a}}^3$

0.964

Sep

37.125 − 0.0416 T_a + 8.328 × 10⁻⁰⁵ ${\text{T}}_{\text{a}}^2$ − 8.146 × 10⁻¹¹ ${\text{T}}_{\text{a}}^3$

0.958

Oct

152.773 − 0.0654 T_a + 4.765 × 10⁻⁰⁵ ${\text{T}}_{\text{a}}^2$ − 3.176 × 10⁻¹⁰ ${\text{T}}_{\text{a}}^3$

0.963

Nov

6.159 − 0.004 T_a + 7.129 × 10⁻⁰⁶ ${\text{T}}_{\text{a}}^2$ + 8.317 × 10⁻¹¹ ${\text{T}}_{\text{a}}^3$

0.957

Dec

4.578 + 0.148 T_a − 6.579 × 10⁻⁰⁶ ${\text{T}}_{\text{a}}^2$ + 6.152 × 10⁻¹⁰ ${\text{T}}_{\text{a}}^3$

0.968