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
91.2
91
92
89
97
97
February
80.6
92
84
74
61
87
March
77.7
90
59
82
88
73
April
83.2
82
89
86
84
May
89.7
92
87
74
94
June
99.1
99
100
98
100
July
96.0
89
99
96
100
August
98.0
99
100
99
93
September
92.0
89
91
93
97
October
94.1
91
97
93
96
November
89.8
94
91
75
87
December
93.0
91
95
95
94
Average
90.5
90.9
88.6
91.4
88.4
92.1
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.