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
74.1
58
75
83
78
71
February
82.0
94
89
82
74
81
March
88.6
94
86
90
87
83
April
91.7
92
96
89
94
91
May
92.6
89
89
93
90
June
97.8
98
96
95
100
July
96.9
99
95
96
97
August
95.5
94
97
100
94
September
95.2
98
92
99
91
October
86.2
86
92
84
82
November
89.9
95
90
99
88
December
85.6
83
62
97
93
Average
89.5
84.4
90.8
89.3
91.8
88.9
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
7.1
4
9
7
6
8
February
10.7
16
13
9
2
9
March
15.4
18
13
15
17
16
April
19.9
21
21
19
19
19
May
24.3
25
24
22
22
June
29.8
30
31
29
30
July
32.2
33
35
30
32
August
30.4
32
32
31
30
September
28.5
29
28
30
27
October
20.7
21
22
21
20
November
14.3
16
14
15
16
December
10.6
11
9
16
10
Average
19.6
14.7
20.9
20.8
19.9
19.8
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
-3.1
-5
0
-6
-2
-1
February
-1.0
3
1
-5
-7
-1
March
4.2
6
3
3
5
6
April
8.1
10
8
8
7
7
May
14.1
14
15
13
13
June
18.9
18
19
19
19
July
21.1
21
21
21
22
August
20.1
21
20
21
19
September
16.8
16
15
17
15
October
9.5
10
8
12
8
November
2.8
4
3
3
5
December
0.7
2
1
4
-1
Average
8.6
3.2
9.9
8.8
9.5
9.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
11.9
23
13
13
14
9
February
10.1
7
9
14
19
9
March
9.7
7
14
17
10
8
April
7.2
9
3
8
9
7
May
9.0
10
13
16
10
June
3.5
2
3
4
4
July
3.3
2
5
2
3
August
4.6
4
3
2
1
September
3.1
1
4
1
2
October
9.9
10
9
14
11
November
4.7
5
1
1
6
December
5.2
11
6
5
8
Average
7.2
11.4
6.7
8.0
7.8
6.4
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
10.0
9
10
11
9
10
February
10.1
10
9
11
9
10
March
10.7
11
11
11
11
10
April
10.7
12
10
12
10
9
May
9.0
8
10
9
9
June
8.0
6
8
7
8
July
7.1
8
8
6
8
August
7.3
7
7
8
8
September
7.6
7
8
9
8
October
9.5
10
9
10
10
November
9.4
9
10
10
11
December
9.5
10
9
11
9
Average
9.2
10.7
8.7
9.2
9.0
8.9
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
239°
231°
291°
245°
197°
February
211°
216°
270°
016°
231°
March
188°
195°
230°
175°
178°
April
194°
209°
190°
222°
225°
May
148°
168°
153°
170°
June
163°
190°
189°
191°
July
227°
208°
223°
184°
August
205°
177°
179°
143°
September
161°
157°
176°
174°
October
215°
236°
208°
171°
November
187°
206°
211°
184°
December
215°
192°
198°
229°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.