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
73.0
86
29
59
69
91
February
87.2
89
84
86
85
86
March
91.9
94
91
78
85
94
April
94.2
98
77
96
97
May
92.8
97
77
94
98
June
95.3
100
83
94
99
July
89.5
99
71
91
85
August
89.3
93
72
93
94
September
87.2
82
81
96
83
October
88.1
93
74
89
89
November
83.7
78
84
93
77
December
67.5
69
65
78
50
Average
87.5
89.6
85.7
75.9
89.1
87.6
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.