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
79.0
85
88
63
76
80
February
89.3
94
89
79
94
97
March
95.5
96
98
96
97
97
April
96.1
93
94
97
98
May
94.9
91
99
99
97
June
96.7
97
97
93
98
July
97.7
99
98
95
99
August
98.1
97
100
96
100
September
95.7
98
96
95
94
October
93.2
98
94
93
95
November
82.2
96
77
62
93
December
81.3
87
59
79
85
Average
92.7
92.0
94.7
90.8
91.3
95.2
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.