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
89.6
87
88
91
92
93
February
90.2
92
91
95
87
84
March
89.9
95
90
91
86
97
April
95.4
89
96
96
100
May
93.2
93
99
90
90
June
95.6
95
91
96
97
July
92.1
84
95
95
95
August
95.8
95
96
96
92
September
96.7
97
95
99
99
October
97.3
95
93
99
99
November
91.0
96
89
86
92
December
90.2
91
95
90
92
Average
92.9
91.3
91.8
93.8
92.8
94.0
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.