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
81.4
83
93
72
82
86
February
85.5
83
91
84
84
89
March
93.5
95
91
98
95
90
April
91.4
86
84
95
92
May
90.2
91
89
91
90
June
90.7
92
93
86
86
July
90.9
95
89
91
95
August
95.7
99
91
94
98
September
92.8
93
96
89
92
October
88.7
94
91
91
89
November
86.8
89
92
73
91
December
81.7
74
78
89
91
Average
89.5
87.4
91.3
89.0
88.9
90.9
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.