Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 8 km or more and a ceiling of 3,000 ft or more. Only observations between sunrise and sunset are taken into account.
Marginal VFR conditions (%)
Month
Average
2024
2023
2022
2021
2020
January
76.8
100
80
79
88
50
February
62.9
70
57
69
69
59
March
81.2
85
98
52
81
88
April
97.7
95
100
97
100
May
98.4
98
100
99
96
June
94.2
93
94
97
94
July
87.3
94
92
86
77
August
83.7
91
81
79
86
September
88.7
94
81
97
84
October
93.4
95
92
100
98
November
96.9
88
97
100
97
December
88.3
95
95
81
87
Average
87.2
85.4
89.3
86.1
89.7
83.6
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 5 km or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.