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
76.3
58
85
85
81
63
February
88.1
95
92
88
82
95
March
86.7
92
81
91
87
78
April
92.9
100
95
94
92
May
92.5
91
89
92
93
June
97.6
97
99
95
99
July
95.8
95
89
97
96
August
95.2
90
95
99
99
September
92.6
93
91
98
85
October
93.2
97
96
94
92
November
93.3
95
96
99
94
December
87.9
77
74
98
93
Average
90.2
81.5
91.1
91.3
93.1
90.2
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
4.3
0
7
5
6
4
February
7.8
14
10
8
0
8
March
13.7
16
11
14
16
15
April
18.8
20
19
19
18
May
24.0
26
25
22
21
June
30.0
30
30
31
31
July
31.1
31
31
31
31
August
30.1
31
32
32
30
September
27.6
29
28
28
25
October
19.6
20
22
21
18
November
12.3
13
13
14
16
December
8.6
9
8
13
9
Average
17.9
10.1
19.8
20.0
19.5
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
-5.3
-7
-2
-7
-2
-3
February
-4.3
0
-3
-6
-9
-3
March
2.8
4
1
2
5
5
April
6.8
7
7
8
6
May
13.9
14
15
14
13
June
19.3
19
20
20
20
July
21.0
20
21
21
22
August
19.7
21
21
21
19
September
16.3
16
15
17
14
October
8.5
9
9
11
7
November
1.7
2
2
4
4
December
-2.7
1
-1
1
-2
Average
7.2
-1.0
8.8
8.4
9.2
8.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
14.4
25
5
14
17
19
February
10.8
4
10
13
23
7
March
10.9
6
19
15
11
11
April
7.4
1
6
11
7
May
6.8
9
11
9
6
June
3.0
4
2
4
2
July
3.6
1
8
4
5
August
3.2
4
4
2
1
September
3.8
3
4
2
7
October
7.5
10
6
9
8
November
6.0
7
6
2
4
December
9.0
21
11
1
3
Average
7.5
11.7
7.5
8.0
7.5
6.3
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
9.4
8
9
10
9
10
February
10.2
10
10
11
10
9
March
11.0
11
11
11
12
10
April
11.3
12
13
11
10
May
9.0
8
10
9
9
June
8.3
7
9
7
9
July
7.2
7
7
6
7
August
7.4
7
7
9
7
September
8.4
8
8
9
8
October
9.5
10
9
9
10
November
9.7
9
11
10
11
December
9.2
9
9
11
8
Average
9.3
9.9
8.7
9.6
9.1
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
293°
287°
308°
302°
267°
February
219°
214°
291°
005°
320°
March
213°
322°
299°
168°
165°
April
220°
214°
237°
274°
May
137°
160°
154°
067°
June
100°
192°
179°
182°
July
227°
137°
159°
141°
August
143°
154°
178°
155°
September
162°
154°
189°
177°
October
254°
240°
179°
221°
November
194°
251°
224°
211°
December
231°
200°
206°
281°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.