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
77.4
71
71
88
84
70
February
82.7
98
91
81
85
76
March
87.9
90
89
96
92
80
April
92.6
99
92
94
91
May
91.0
90
90
93
87
June
96.2
95
97
95
97
July
92.0
95
92
93
76
August
93.9
88
95
97
92
September
92.3
93
91
91
91
October
87.1
91
92
85
75
November
88.1
95
87
97
90
December
82.5
68
59
77
97
Average
88.9
86.4
90.5
90.2
90.9
85.4
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
5.9
4
9
5
5
7
February
10.5
16
13
9
5
9
March
14.6
18
13
16
17
15
April
19.4
21
19
19
19
May
24.3
25
24
23
22
June
29.4
31
31
29
29
July
31.2
32
33
29
32
August
29.3
29
29
31
29
September
27.4
27
27
27
26
October
20.3
21
20
22
19
November
13.1
15
13
13
16
December
9.4
8
8
14
9
Average
18.7
12.4
20.7
19.9
19.7
19.2
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
-4.8
-5
0
-6
-2
-1
February
-1.1
2
1
-5
-3
-2
March
3.4
5
2
3
4
5
April
7.1
7
7
7
7
May
13.3
13
14
11
12
June
17.6
16
18
19
17
July
20.5
20
22
20
21
August
19.0
20
19
20
18
September
15.6
15
14
16
14
October
8.6
9
6
12
7
November
2.1
3
2
2
5
December
0.0
5
1
3
-2
Average
7.7
0.8
9.4
8.2
9.0
8.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
13.2
17
12
13
11
15
February
12.0
3
12
19
22
13
March
12.9
8
13
13
11
16
April
10.1
2
16
10
10
May
7.5
4
9
10
11
June
3.5
4
3
6
4
July
3.5
2
4
4
3
August
4.7
4
8
1
5
September
3.0
3
3
3
3
October
8.8
11
6
9
13
November
7.0
4
5
2
6
December
9.8
18
19
10
5
Average
8.0
9.2
6.2
9.0
7.7
8.4
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
7.6
7
8
8
7
7
February
8.1
8
8
9
8
8
March
8.5
9
9
9
9
8
April
8.4
9
9
8
8
May
6.9
6
8
7
7
June
5.8
6
6
6
6
July
5.4
6
6
5
5
August
5.2
5
5
5
5
September
5.4
5
5
6
6
October
7.2
8
7
7
7
November
7.3
6
8
8
8
December
7.3
8
6
8
7
Average
7.0
8.0
6.7
7.0
6.8
6.8
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
257°
244°
295°
281°
226°
February
241°
221°
260°
336°
272°
March
204°
236°
221°
166°
206°
April
208°
204°
225°
246°
May
111°
183°
159°
209°
June
346°
194°
192°
192°
July
242°
176°
154°
183°
August
251°
172°
165°
055°
September
178°
341°
179°
162°
October
236°
236°
204°
223°
November
222°
228°
230°
205°
December
244°
175°
207°
245°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.