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
76.3
82
81
67
70
80
February
88.0
89
72
93
85
94
March
90.3
92
87
96
89
90
April
94.5
91
93
91
99
May
95.4
95
99
95
98
June
96.7
98
99
95
94
July
95.7
95
98
93
96
August
95.2
90
96
91
98
September
95.1
97
95
94
96
October
94.8
95
99
92
94
November
88.9
94
94
75
95
December
79.5
78
75
74
85
Average
91.6
88.2
90.7
93.9
88.6
94.0
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.