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
92.1
88
96
91
92
98
February
83.6
85
89
76
60
87
March
84.7
94
67
85
95
76
April
88.2
86
95
90
84
May
93.5
92
92
85
95
June
99.2
97
100
99
100
July
96.9
96
99
96
99
August
98.2
99
99
100
94
September
93.5
89
91
97
97
October
93.3
91
95
90
99
November
92.9
95
98
88
92
December
92.6
88
86
97
94
Average
92.2
89.1
90.5
92.8
91.3
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.