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
83.9
91
91
77
80
80
February
92.9
98
88
99
85
98
March
96.9
97
98
97
98
99
April
97.2
96
94
97
99
May
97.1
99
98
98
98
June
96.8
99
98
95
93
July
97.2
98
99
95
98
August
97.3
95
97
96
98
September
95.7
97
92
96
98
October
92.7
96
94
90
91
November
82.3
93
80
77
74
December
79.1
87
84
59
69
Average
93.9
95.5
95.5
93.8
90.6
93.0
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.