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
82.0
84
88
75
76
85
February
91.8
90
88
94
91
96
March
93.8
94
91
97
93
98
April
96.6
95
98
92
99
May
96.8
97
100
97
100
June
98.2
99
100
95
99
July
97.1
96
99
94
97
August
97.0
95
98
95
98
September
96.8
98
97
98
96
October
96.1
98
96
94
98
November
89.2
89
93
76
92
December
80.2
81
71
78
84
Average
93.6
89.7
93.8
95.2
91.3
96.0
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.