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
87.8
90
92
93
80
82
February
89.6
90
95
86
93
82
March
90.8
89
83
93
91
92
April
94.9
92
94
93
93
May
95.3
96
88
100
98
June
95.4
93
92
98
98
July
93.8
91
91
92
96
August
95.0
94
100
97
98
September
96.5
98
88
99
97
October
95.9
96
91
98
99
November
94.4
96
96
94
98
December
88.4
85
92
91
84
Average
93.5
89.2
93.0
91.9
95.1
95.0
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.