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
87.9
88
88
93
91
92
February
88.8
91
92
96
76
85
March
86.0
94
89
90
77
96
April
92.0
85
93
94
98
May
90.7
92
97
89
84
June
91.1
93
85
89
91
July
89.3
88
94
89
88
August
94.8
97
93
93
90
September
93.9
93
96
96
96
October
96.8
97
94
98
96
November
89.5
96
90
85
91
December
91.2
93
97
94
94
Average
91.0
91.2
91.7
92.9
89.4
91.7
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.