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
77.8
85
87
89
81
56
February
88.8
95
95
97
86
99
March
94.9
95
93
99
98
97
April
97.6
100
95
94
100
May
97.2
92
100
97
100
June
98.6
97
99
100
98
July
98.8
97
100
100
100
August
99.0
99
100
98
98
September
95.5
96
93
98
99
October
84.6
94
70
81
88
November
69.7
84
60
69
53
December
72.9
74
46
77
53
Average
91.4
91.8
93.3
90.6
91.5
89.5
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.