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
92.9
93
91
94
98
89
February
91.6
95
88
94
91
95
March
91.9
94
97
86
90
93
April
96.2
100
97
100
93
May
97.9
100
92
100
100
June
100.0
100
100
100
100
July
99.5
100
97
100
100
August
99.9
100
100
100
100
September
99.9
100
100
100
100
October
99.3
100
100
100
100
November
93.6
99
91
93
92
December
96.4
98
97
92
96
Average
96.4
94.1
98.0
95.7
97.2
96.7
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.