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
95.8
100
95
92
96
97
February
94.6
94
99
92
93
97
March
95.1
97
96
92
94
April
91.6
89
95
92
95
May
89.0
88
95
92
92
June
84.3
89
87
93
74
July
83.8
94
76
91
86
August
91.3
95
93
89
93
September
89.8
90
97
83
90
October
93.8
97
94
93
93
November
95.8
94
97
90
98
December
96.7
96
98
97
100
Average
92.9
97.1
93.8
92.7
91.9
93.0
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.