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
96.9
100
95
97
100
99
February
94.8
96
97
87
94
96
March
92.0
97
90
86
90
96
April
91.4
95
87
89
95
May
91.2
97
93
94
96
June
91.5
95
84
91
93
July
95.8
96
93
95
95
August
95.2
97
96
89
93
September
94.8
98
93
92
97
October
91.8
96
89
89
94
November
92.1
95
93
91
91
December
96.1
97
95
92
98
Average
94.0
97.7
95.6
90.9
92.1
95.2
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.