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
93.5
99
85
93
95
93
February
96.6
100
93
96
98
94
March
97.1
97
98
97
97
94
April
92.4
98
94
89
93
May
80.2
96
73
65
85
June
84.9
97
72
92
86
July
85.6
98
79
90
80
August
85.3
95
74
87
91
September
85.2
93
84
82
87
October
89.8
93
92
91
89
November
90.8
94
91
89
91
December
93.3
94
97
92
97
Average
90.7
98.4
94.1
86.9
89.0
90.1
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.