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
88.3
89
91
93
85
90
February
96.2
98
97
100
90
96
March
97.6
99
98
97
97
April
95.8
95
90
97
100
May
96.8
98
100
99
97
June
97.2
100
99
92
93
July
98.8
100
100
97
99
August
98.2
97
99
97
100
September
97.7
99
99
97
98
October
94.4
99
94
95
91
November
88.9
99
92
82
93
December
89.0
93
74
86
89
Average
95.3
93.6
97.5
96.2
93.8
95.6
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.