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
93.5
93
95
94
91
98
February
89.3
75
92
98
88
97
March
81.9
62
91
63
97
83
April
88.4
93
68
87
95
May
92.9
90
93
90
96
June
91.3
87
88
84
92
July
90.9
85
88
90
96
August
92.2
97
85
74
98
September
89.9
83
85
82
97
October
97.0
93
96
97
98
November
94.2
95
93
97
93
December
93.3
93
81
97
93
Average
89.6
75.0
90.6
85.5
88.8
94.5
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.