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
79.2
77
87
82
84
72
February
84.1
67
86
99
84
83
March
84.6
88
89
87
78
88
April
88.7
94
88
84
97
May
87.4
95
85
88
82
June
85.9
81
92
87
81
July
92.1
98
99
83
87
August
97.4
99
100
97
99
September
94.5
97
94
95
95
October
96.8
98
99
96
98
November
91.5
99
86
96
90
December
88.0
86
90
95
87
Average
88.0
77.8
92.3
91.7
88.7
88.3
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.