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
89.7
95
93
88
84
97
February
89.1
98
92
81
95
95
March
79.9
84
97
64
89
61
April
71.1
86
62
67
49
May
76.0
76
87
80
49
June
81.9
85
92
71
73
July
85.8
93
91
84
76
August
81.7
81
90
80
82
September
89.7
85
97
86
92
October
91.4
92
95
94
81
November
89.2
84
95
86
90
December
90.4
89
97
89
91
Average
85.0
91.6
87.3
86.0
83.1
76.7
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.