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
67.8
80
76
96
66
64
February
76.3
67
79
81
94
March
87.1
85
87
91
91
95
April
92.4
87
92
96
100
May
97.0
99
99
95
99
June
96.6
96
99
100
90
July
96.4
98
98
94
100
August
96.9
94
96
97
99
September
95.4
97
99
96
94
October
89.9
89
90
95
91
November
70.5
84
65
100
64
December
65.1
60
57
49
66
Average
87.0
77.8
89.6
91.4
91.7
88.1
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.