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
91.4
90
96
92
February
88.6
90
91
90
March
86.2
95
100
78
April
89.1
97
100
91
May
78.8
93
83
June
67.5
80
61
July
75.3
83
79
August
72.0
75
74
100
September
80.0
72
89
October
94.7
96
93
November
97.8
99
100
67
December
88.4
92
100
Average
86.6
93.2
87.5
84.6
100.0
66.6
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.