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
January
57.7
63
63
48
February
77.2
87
63
81
March
93.6
96
89
96
April
95.5
98
93
May
93.0
95
91
100
June
92.5
97
93
86
July
96.3
97
100
93
August
98.9
98
100
99
September
93.4
96
86
98
October
87.4
86
89
87
November
72.9
82
78
59
December
66.4
59
81
65
Average
84.8
82.0
85.8
87.0
84.5
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.