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
77.3
84
88
70
77
81
February
88.3
96
86
99
85
97
March
95.1
95
98
99
98
97
April
96.5
96
94
97
100
May
96.0
95
98
97
98
June
96.8
100
98
98
89
July
97.2
99
98
95
97
August
96.2
94
96
95
97
September
93.7
93
95
96
94
October
87.8
93
90
84
87
November
73.7
96
80
65
61
December
76.6
89
54
70
54
Average
91.4
92.4
94.5
92.1
90.1
89.8
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.