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
91.9
90
90
92
92
92
February
90.9
91
93
91
92
95
March
89.6
95
93
88
89
87
April
86.7
73
83
90
88
May
86.3
81
92
82
88
June
88.9
89
84
97
91
July
86.9
88
93
78
87
August
89.9
95
84
93
87
September
92.8
93
86
93
95
October
94.4
95
90
0
94
November
92.8
94
88
93
December
94.0
94
95
95
Average
90.7
91.9
90.2
88.7
89.6
91.2
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.