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
76.6
92
72
76
62
90
February
89.2
83
91
95
79
94
March
91.8
95
91
94
85
94
April
92.9
88
94
89
100
May
94.5
97
98
91
95
June
96.7
98
96
95
96
July
97.5
100
99
94
99
August
94.6
96
91
88
95
September
94.3
98
92
93
96
October
92.7
93
98
95
88
November
87.9
86
90
82
97
December
81.5
80
55
77
92
Average
91.8
90.6
92.2
92.5
87.4
95.1
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.