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
74.3
60
73
90
79
66
February
86.7
94
85
94
83
96
March
86.5
92
86
89
89
76
April
91.7
88
97
91
97
92
May
91.7
92
92
92
92
June
94.6
90
96
96
96
July
95.7
93
94
94
96
August
96.0
94
95
100
98
September
91.6
91
92
98
84
October
92.5
95
98
88
96
November
91.8
97
91
98
89
December
82.9
75
72
90
85
Average
89.4
83.5
89.2
92.0
92.3
89.4
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
0.2
-2
2
-1
0
1
February
4.0
11
6
4
-5
3
March
10.5
13
9
11
13
12
April
16.8
18
18
15
17
16
May
22.8
25
24
21
20
June
28.6
29
29
29
28
July
29.7
29
30
28
30
August
28.8
29
30
29
29
September
26.2
27
26
27
24
October
17.5
19
19
19
16
November
9.8
12
10
12
14
December
5.3
7
4
9
4
Average
15.8
10.0
17.6
16.9
16.6
16.3
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
-8.0
-9
-5
-13
-6
-7
February
-7.2
-2
-6
-9
-13
-6
March
-1.9
2
-3
-1
3
2
April
4.6
6
4
3
6
4
May
11.8
11
13
11
11
June
17.3
16
17
18
18
July
18.9
17
19
19
20
August
17.4
18
18
19
17
September
14.2
14
13
14
12
October
6.5
8
5
10
4
November
-1.2
0
0
0
2
December
-4.0
0
-4
-3
-6
Average
5.1
-1.2
6.1
5.4
6.5
5.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.8
10
3
7
8
13
February
8.3
2
15
7
14
5
March
9.1
6
11
12
8
10
April
7.7
11
4
12
5
6
May
5.3
1
7
10
5
June
3.6
3
3
4
6
July
2.4
1
5
5
5
August
3.0
5
4
2
2
September
5.2
2
5
1
13
October
9.0
13
4
12
5
November
8.9
4
14
7
9
December
7.3
16
12
1
6
Average
6.4
7.5
6.1
7.3
6.3
6.7
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
10.1
9
10
11
9
10
February
10.6
10
11
12
10
10
March
11.4
12
11
12
12
10
April
11.9
13
12
13
11
12
May
9.5
9
11
10
9
June
8.2
8
8
7
9
July
7.0
6
8
6
7
August
7.1
7
7
7
7
September
8.0
7
8
8
9
October
9.9
10
10
10
10
November
10.4
9
12
11
12
December
9.6
9
11
11
9
Average
9.6
11.2
9.1
10.0
9.2
9.4
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
293°
290°
289°
324°
284°
February
267°
266°
294°
328°
321°
March
303°
315°
311°
153°
246°
April
259°
243°
244°
257°
280°
May
119°
160°
165°
006°
June
088°
209°
212°
180°
July
311°
234°
049°
175°
August
319°
263°
169°
189°
September
177°
251°
210°
221°
October
287°
254°
340°
283°
November
239°
250°
245°
221°
December
240°
198°
227°
285°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.