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
2021
2020
January
88.5
92
88
89
81
93
February
89.8
96
93
94
84
78
March
91.0
89
94
94
89
91
April
93.2
88
97
99
97
May
89.7
93
90
91
87
June
85.1
83
89
90
85
July
76.5
74
79
81
73
August
75.5
79
74
73
71
September
80.0
78
81
76
78
October
87.6
91
95
82
79
November
95.4
99
94
96
96
December
86.1
90
61
92
90
Average
86.4
91.8
86.0
87.0
86.0
84.4
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
2021
2020
January
8.4
8
11
8
8
9
February
13.0
14
14
13
11
10
March
15.6
17
16
17
17
17
April
19.2
19
19
19
18
May
22.1
21
24
22
21
June
25.0
24
27
25
25
July
26.9
27
27
26
27
August
26.0
27
26
26
26
September
23.9
24
23
23
23
October
19.9
20
19
19
20
November
15.0
16
14
14
17
December
11.0
11
10
15
9
Average
18.5
13.1
19.4
19.1
18.7
18.6
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
-1.5
-2
2
-2
0
1
February
3.2
2
5
1
1
1
March
4.8
5
4
5
6
8
April
7.7
8
7
7
7
May
12.2
11
13
11
10
June
15.3
14
16
16
15
July
17.6
18
18
17
18
August
17.0
17
17
17
17
September
13.7
14
13
14
14
October
9.2
9
6
9
10
November
4.5
7
5
2
6
December
2.8
4
4
5
-1
Average
8.6
1.6
9.5
8.8
8.6
9.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
12.4
13
13
10
13
17
February
14.0
7
15
9
13
32
March
10.3
13
11
7
6
13
April
9.0
14
6
5
8
May
6.2
3
7
3
10
June
4.2
6
2
4
5
July
2.1
1
3
4
2
August
5.0
3
5
8
5
September
5.3
3
8
7
10
October
6.4
3
1
13
8
November
4.6
6
11
4
2
December
12.3
14
21
9
9
Average
7.8
11.0
6.4
6.4
7.0
8.9
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
2021
2020
January
3.9
4
3
3
3
4
February
4.0
3
4
5
5
4
March
4.7
4
4
6
4
4
April
5.0
4
4
5
6
May
3.6
3
3
4
4
June
2.5
2
2
3
3
July
2.0
1
2
2
2
August
1.9
2
1
2
2
September
2.0
2
2
2
2
October
2.8
3
2
3
3
November
2.8
2
3
2
4
December
3.0
3
2
3
4
Average
3.3
3.8
2.7
2.9
3.2
3.5
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
271°
248°
296°
299°
235°
February
257°
242°
226°
268°
287°
March
177°
253°
221°
195°
225°
April
228°
236°
282°
275°
May
231°
198°
241°
258°
June
274°
239°
225°
237°
July
282°
226°
221°
206°
August
265°
189°
172°
201°
September
211°
200°
257°
151°
October
273°
240°
206°
218°
November
193°
200°
299°
211°
December
180°
252°
231°
273°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.