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
89.4
90
88
94
90
93
February
87.9
88
81
92
86
97
March
88.2
85
91
84
91
93
April
91.1
94
97
87
92
May
92.7
79
96
97
93
June
98.3
96
100
100
96
July
99.5
100
100
100
100
August
98.9
99
100
100
99
September
97.7
97
97
100
99
October
90.3
86
91
90
94
November
85.6
96
92
71
81
December
88.6
96
62
99
84
Average
92.4
87.5
92.1
93.8
93.4
94.1
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.