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
81.2
60
84
95
85
75
February
88.2
89
100
92
90
90
March
85.6
78
88
91
86
76
April
93.8
99
95
95
93
May
90.0
93
83
87
87
June
97.7
97
98
95
99
July
96.8
93
98
98
96
August
96.0
99
99
98
97
September
91.6
97
96
90
87
October
89.5
91
98
78
92
November
89.2
86
87
96
92
December
88.9
81
78
97
93
Average
89.5
75.6
92.1
93.0
91.4
89.9
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
6.1
2
8
8
7
6
February
8.3
15
11
8
2
8
March
14.5
15
13
15
16
15
April
19.5
22
21
18
19
May
24.4
27
25
22
22
June
31.3
31
32
31
33
July
32.5
33
34
32
32
August
30.3
35
35
25
31
September
28.6
31
31
28
26
October
20.1
22
23
20
18
November
13.3
15
12
15
16
December
9.2
10
8
14
9
Average
18.8
10.3
22.0
21.3
19.3
19.6
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
-5.4
-7
-3
-7
-2
-3
February
-4.3
1
-4
-5
-9
-4
March
2.4
3
2
1
4
4
April
6.3
6
8
6
6
May
13.0
13
14
12
12
June
19.0
18
20
19
20
July
20.5
21
22
20
21
August
18.5
20
20
14
18
September
16.1
17
16
16
14
October
7.9
10
9
8
7
November
1.7
3
1
3
4
December
-2.0
0
-2
0
-3
Average
7.0
-2.8
9.4
8.3
7.8
8.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.3
15
9
8
9
7
February
8.4
6
0
13
21
8
March
5.0
4
3
10
7
5
April
4.2
4
2
4
5
May
4.8
6
10
5
5
June
1.7
4
3
2
0
July
1.4
2
3
3
0
August
1.5
1
1
1
0
September
3.1
6
4
1
3
October
4.2
4
3
3
4
November
4.4
7
5
2
2
December
4.6
12
4
0
5
Average
4.6
8.4
4.8
5.1
4.4
3.5
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
11.4
10
10
11
13
12
February
12.0
12
11
13
12
11
March
13.5
12
14
14
15
11
April
14.0
14
16
14
12
May
11.0
10
12
11
11
June
11.1
8
11
10
14
July
9.0
9
9
9
9
August
9.0
9
9
11
9
September
10.3
10
10
9
10
October
11.8
13
11
10
12
November
12.1
11
14
12
14
December
11.2
11
12
11
10
Average
11.3
11.3
10.7
11.8
11.3
11.2
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
309°
311°
294°
309°
301°
February
231°
217°
321°
003°
324°
March
230°
290°
318°
187°
200°
April
227°
201°
253°
263°
May
157°
149°
144°
062°
June
154°
171°
175°
182°
July
189°
158°
165°
158°
August
218°
163°
173°
159°
September
171°
170°
187°
201°
October
246°
220°
254°
205°
November
180°
255°
220°
202°
December
262°
216°
212°
303°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.