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
72.7
71
68
68
78
84
February
72.5
81
73
73
63
67
March
84.3
82
84
88
88
69
April
88.7
83
87
94
91
May
92.9
96
87
94
94
June
91.3
86
93
91
94
July
91.6
90
88
87
95
August
90.1
85
86
91
93
September
88.6
87
84
88
92
October
87.3
87
93
86
86
November
86.0
89
81
95
91
December
75.5
75
52
83
76
Average
84.8
77.6
83.2
83.0
87.1
86.7
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
7.8
5
12
6
7
10
February
11.9
14
14
11
8
10
March
14.8
16
15
16
16
16
April
18.7
19
18
18
17
May
23.2
22
24
22
21
June
26.3
25
28
26
26
July
28.1
28
29
27
29
August
27.1
27
27
28
27
September
25.1
25
24
24
24
October
19.8
19
18
20
20
November
13.6
15
14
13
16
December
10.2
11
10
14
8
Average
18.0
11.7
18.9
19.0
18.6
18.8
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
-1.3
-3
2
-4
-1
2
February
2.2
2
4
-1
-1
1
March
4.3
6
4
4
5
7
April
7.4
7
7
6
6
May
13.0
12
14
11
12
June
16.0
14
16
16
16
July
18.8
18
20
18
19
August
18.2
18
18
19
19
September
15.0
15
14
14
15
October
9.2
9
6
11
10
November
2.9
4
4
1
5
December
1.6
2
3
5
0
Average
8.1
1.6
8.8
8.7
8.8
9.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
11.8
19
12
15
6
13
February
11.8
9
10
12
9
23
March
8.4
12
6
13
8
10
April
7.3
8
5
7
7
May
4.2
2
6
3
4
June
7.3
8
4
16
11
July
3.2
3
5
4
3
August
4.7
4
4
6
8
September
7.3
5
11
17
3
October
4.7
2
2
7
5
November
6.3
4
11
3
7
December
10.4
10
24
7
8
Average
7.7
13.0
6.3
8.4
7.7
8.0
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
2021
2020
January
6.5
7
6
6
6
6
February
6.7
6
7
7
7
7
March
7.2
7
7
8
7
6
April
6.8
7
7
6
7
May
5.5
5
5
5
6
June
4.7
5
5
4
5
July
4.1
4
4
4
4
August
4.0
5
4
4
4
September
4.2
4
5
4
5
October
5.0
5
6
5
4
November
5.7
6
6
5
6
December
5.9
6
5
6
6
Average
5.6
6.6
5.6
5.5
5.2
5.4
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
261°
251°
302°
264°
246°
February
273°
245°
236°
293°
254°
March
268°
259°
241°
191°
237°
April
252°
253°
282°
285°
May
305°
248°
311°
261°
June
297°
307°
231°
302°
July
277°
264°
274°
284°
August
304°
256°
345°
294°
September
326°
352°
299°
050°
October
293°
288°
262°
217°
November
292°
278°
286°
247°
December
251°
232°
221°
250°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.