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
73.1
76
71
77
84
60
February
70.8
72
67
59
66
74
March
80.9
83
82
87
71
90
April
95.3
97
97
95
97
May
99.0
99
98
100
100
June
99.4
99
100
100
100
July
99.4
99
99
100
100
August
98.8
100
100
100
98
September
98.0
96
98
100
99
October
92.9
85
93
96
97
November
82.4
83
77
79
88
December
78.4
73
91
81
69
Average
89.4
77.4
89.7
91.6
91.3
91.6
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.