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
73.1
52
67
93
72
71
February
85.5
92
83
94
82
91
March
87.9
92
88
84
89
79
April
91.3
92
92
97
93
May
92.4
96
94
93
90
June
93.3
86
96
96
97
July
94.9
92
90
93
96
August
93.3
94
91
98
97
September
91.4
87
94
99
82
October
90.3
89
95
88
94
November
90.8
93
88
100
92
December
81.6
71
75
87
85
Average
88.2
78.7
87.0
91.0
91.8
89.3
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
-1.5
-2
2
-2
-1
1
February
3.1
11
6
2
-6
2
March
9.5
13
8
10
12
11
April
15.8
18
14
17
16
May
22.9
26
24
21
21
June
28.4
29
29
29
29
July
28.8
29
28
28
30
August
27.7
29
27
29
28
September
25.6
26
24
28
24
October
17.4
18
18
19
16
November
9.0
11
11
10
13
December
4.5
7
4
7
3
Average
14.9
7.1
17.4
16.2
16.2
16.1
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
-8.2
-7
-4
-13
-6
-6
February
-7.2
-2
-4
-9
-13
-6
March
-1.8
1
0
-1
2
1
April
4.2
5
3
6
4
May
11.7
12
13
11
11
June
17.2
16
17
18
18
July
18.6
18
19
18
20
August
16.6
18
18
18
16
September
13.8
15
13
14
12
October
6.5
8
5
10
5
November
-1.3
0
0
0
2
December
-4.2
0
-4
-3
-5
Average
4.7
-3.3
6.9
5.5
6.2
5.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.8
18
15
5
10
7
February
8.6
3
16
6
11
6
March
8.7
7
8
17
7
10
April
8.3
4
14
7
5
May
6.1
1
9
10
7
June
4.0
3
4
6
6
July
2.9
2
8
3
4
August
2.9
3
6
2
0
September
5.1
4
4
2
8
October
7.2
7
8
13
5
November
6.9
5
15
2
6
December
9.0
19
14
3
6
Average
6.8
9.4
6.6
8.9
6.2
5.6
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
10.2
10
10
11
9
10
February
10.9
10
12
12
9
11
March
11.6
12
11
12
12
11
April
12.1
13
14
11
12
May
10.1
9
11
10
11
June
8.5
8
9
8
8
July
6.7
6
7
7
6
August
6.6
7
7
7
6
September
7.4
7
7
8
8
October
9.3
10
9
9
10
November
10.2
10
11
12
12
December
9.9
10
10
11
9
Average
9.5
10.8
9.1
9.9
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
276°
279°
269°
312°
258°
February
233°
262°
274°
288°
297°
March
280°
254°
298°
160°
229°
April
249°
239°
257°
278°
May
076°
142°
168°
026°
June
041°
220°
219°
174°
July
281°
240°
334°
178°
August
240°
225°
184°
204°
September
140°
287°
226°
244°
October
284°
235°
018°
267°
November
246°
230°
244°
219°
December
229°
184°
216°
268°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.