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
90.3
91
93
89
97
83
February
93.8
95
84
92
100
92
March
94.1
99
95
74
100
94
April
91.2
98
51
100
92
May
91.8
100
59
100
90
June
96.1
100
85
100
93
July
95.9
100
91
99
92
August
95.5
100
94
98
92
September
94.9
96
98
86
100
October
91.2
96
94
71
100
November
84.0
98
53
88
98
December
88.2
90
64
97
100
Average
93.3
95.1
96.3
81.2
94.0
93.1
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.