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
72.3
85
84
67
68
63
February
83.1
76
86
93
84
90
March
89.5
85
89
96
92
90
April
91.9
90
96
95
95
May
91.7
85
96
95
99
June
93.0
97
93
83
98
July
95.9
94
98
94
94
August
94.0
94
96
94
95
September
92.2
93
92
92
88
October
91.1
90
92
85
92
November
78.7
84
77
79
78
December
73.6
78
74
65
71
Average
88.1
82.1
89.5
91.2
87.3
89.8
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.