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
81.6
83
81
94
79
78
February
89.3
89
92
99
77
99
March
93.4
90
99
91
91
94
April
95.6
92
95
97
100
May
97.4
98
98
98
98
June
96.7
96
97
97
94
July
98.6
100
99
95
98
August
97.2
96
98
94
95
September
92.8
95
87
95
95
October
87.6
92
81
86
93
November
75.3
94
60
79
60
December
82.1
85
59
77
76
Average
91.6
87.6
94.1
90.7
90.3
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.