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
71.8
83
59
89
69
85
February
85.1
91
95
98
70
99
March
90.1
91
96
95
85
93
April
95.0
93
97
94
100
May
97.3
98
100
98
99
June
96.9
99
100
99
95
July
98.7
100
100
100
99
August
98.6
99
100
99
99
September
98.0
100
97
100
97
October
91.2
99
100
91
85
November
74.3
94
76
79
81
December
63.7
77
50
50
50
Average
90.0
88.4
93.5
94.5
88.6
91.9
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.