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
86.7
97
90
84
83
92
February
90.2
82
96
91
89
91
March
92.4
95
94
91
91
89
April
90.8
87
85
95
88
May
89.6
92
90
93
86
June
88.4
92
87
83
95
July
90.5
94
95
85
93
August
94.1
94
94
93
96
September
94.2
98
95
90
96
October
91.3
96
93
97
92
November
89.3
88
93
80
94
December
87.9
86
81
95
94
Average
90.7
91.8
92.4
90.2
89.5
92.1
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.