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
85.6
95
98
67
95
84
February
89.9
99
94
94
94
87
March
96.4
100
99
93
96
97
April
99.7
100
100
100
100
100
May
99.7
100
100
100
June
99.6
98
100
100
100
July
98.2
98
100
100
August
97.8
100
100
100
92
September
96.8
100
92
100
October
85.8
98
69
100
100
November
82.0
89
86
100
December
74.4
89
69
100
33
Average
93.1
98.4
96.4
91.1
97.4
89.0
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.