Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 5 mi 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
January
73.7
70
78
February
90.6
89
93
March
90.1
92
89
April
95.6
95
96
May
97.9
98
June
89.0
89
July
93.2
93
August
97.0
97
September
96.5
96
99
October
95.4
93
98
November
94.5
95
94
December
84.1
82
88
Average
91.4
87.4
91.8
95.1
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 3⅛ mi or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.
Maximum temperatures (°C)
Month
Average
2024
2023
2022
January
3.0
1
5
February
8.2
8
8
March
9.8
12
8
April
17.3
18
17
May
22.2
22
June
25.0
25
July
28.1
28
August
26.0
26
September
23.0
24
22
October
18.0
18
18
November
11.5
11
12
December
6.9
8
5
Average
13.4
9.6
16.7
14.0
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
-3.3
-4
-1
February
-3.8
-2
-2
March
0.8
2
0
April
5.8
7
4
May
9.1
9
June
13.5
14
July
17.8
18
August
15.9
16
September
13.1
14
12
October
7.4
9
6
November
1.3
1
2
December
0.9
2
-1
Average
3.9
0.6
6.9
4.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
22.3
23
22
February
7.3
5
10
March
12.0
9
15
April
8.7
7
10
May
1.7
2
June
5.5
6
July
4.4
4
August
5.3
5
September
2.0
2
2
October
7.0
10
5
November
7.2
6
8
December
9.3
13
4
Average
7.9
10.4
8.3
5.0
Precipitation during daylight period
Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.
Wind speed (knots)
Month
Average
2024
2023
2022
January
9.0
10
8
February
10.3
9
11
March
10.9
11
11
April
9.8
10
9
May
7.6
8
June
7.3
7
July
5.7
6
August
6.2
6
September
6.4
5
9
October
8.8
8
10
November
9.5
9
10
December
8.2
8
9
Average
9.2
10.1
7.9
9.5
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
234°
243°
February
242°
235°
March
239°
268°
April
252°
242°
May
039°
June
019°
July
240°
August
247°
September
034°
267°
October
249°
230°
November
231°
226°
December
227°
230°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.