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
72.9
77
70
60
77
85
February
87.5
86
83
95
91
87
March
92.2
82
98
88
86
97
April
96.5
95
98
98
94
May
98.4
100
98
98
98
June
98.7
99
98
98
100
July
99.3
99
99
100
99
August
99.3
97
99
100
100
September
98.8
98
98
99
99
October
96.4
93
94
98
100
November
85.0
79
71
86
92
December
73.4
72
78
69
76
Average
91.5
81.8
91.7
91.1
92.6
94.6
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.