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
83.2
87
57
82
92
91
February
89.0
89
92
92
87
91
March
91.6
98
92
88
92
93
April
92.1
94
82
98
98
May
89.5
90
72
97
96
June
95.2
96
86
94
100
July
97.7
96
91
100
99
August
97.7
96
92
100
100
September
98.4
98
100
100
98
October
91.9
92
92
100
96
November
82.5
81
84
95
78
December
77.6
84
59
85
69
Average
91.1
91.6
89.9
85.8
95.2
92.8
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.