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
86.0
83
83
93
100
February
93.5
88
100
94
100
0
March
94.5
93
95
97
April
97.6
100
95
100
May
99.3
99
100
100
June
99.7
100
100
July
100.0
100
100
August
100.0
100
100
September
98.5
98
100
33
October
96.6
96
97
November
83.2
75
92
December
80.7
77
89
0
Average
67.7
88.2
94.2
96.9
71.4
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.