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
96.6
97
97
99
94
100
February
91.3
80
87
95
84
100
March
85.3
86
95
65
92
85
April
84.3
87
59
90
93
May
90.1
84
91
90
88
June
90.0
88
100
71
86
July
94.2
89
91
96
94
August
93.5
97
94
86
96
September
91.1
89
93
74
99
October
98.4
94
99
100
100
November
94.6
81
96
97
100
December
96.2
96
100
94
93
Average
91.4
87.5
90.2
89.1
88.7
93.9
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.