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
70.6
80
80
69
63
65
February
82.1
75
78
87
90
92
March
89.7
85
96
92
93
90
April
92.5
88
92
95
99
May
92.3
89
98
95
98
June
92.9
95
97
87
97
July
95.1
92
98
94
95
August
94.7
95
97
95
95
September
92.8
93
96
89
95
October
88.3
91
87
86
89
November
78.6
85
72
76
75
December
69.3
80
60
64
70
Average
87.4
80.6
89.5
90.1
87.5
90.3
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.