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
85.7
88
91
96
73
86
February
92.9
93
98
94
82
91
March
92.6
92
90
89
97
92
April
93.6
97
93
90
91
May
96.0
96
99
96
95
June
97.6
97
97
97
98
July
95.9
98
98
96
96
August
95.4
99
90
96
95
September
96.0
96
93
93
98
October
94.2
95
96
93
93
November
91.7
87
90
94
91
December
85.3
84
89
83
84
Average
93.2
90.9
94.3
93.9
91.5
92.8
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.