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
70.2
76
69
73
71
62
February
74.1
82
65
77
87
69
March
88.1
84
89
92
87
88
April
95.0
95
93
94
99
May
95.7
98
100
97
95
June
97.5
100
96
97
100
July
94.2
97
98
98
95
August
92.8
89
95
91
96
September
92.0
95
95
90
94
October
88.8
92
95
89
76
November
75.0
81
85
67
72
December
69.8
74
75
72
67
Average
87.5
81.2
89.2
91.7
88.9
87.4
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.