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
92.8
97
97
82
97
96
February
89.6
89
93
95
92
85
March
91.3
97
90
91
89
93
April
91.4
89
86
95
92
May
87.8
73
83
99
90
June
0
0
0
0
July
93.4
100
96
91
95
August
96.7
99
95
95
98
September
95.7
90
97
94
97
October
97.8
99
98
95
100
November
95.5
99
94
100
93
December
88.8
100
86
100
100
Average
93.4
94.5
90.4
91.5
94.5
95.0
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.