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
64.5
60
65
0
75
75
February
75.1
97
94
0
84
83
March
74.0
81
76
0
88
83
April
80.7
92
99
0
94
91
May
90.5
91
0
95
84
June
94.3
92
96
96
July
92.5
94
65
96
95
August
95.0
92
92
98
98
September
93.8
94
90
97
91
October
89.3
90
95
56
88
November
92.0
96
96
99
93
December
74.0
83
65
0
94
Average
83.7
84.2
88.8
48.8
85.1
89.4
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
0
8
7
6
7
February
9.5
10
13
9
2
9
March
13.7
18
13
16
17
16
April
19.8
22
22
16
20
19
May
24.1
26
0
23
22
June
29.7
30
30
30
July
31.5
32
34
30
32
August
28.9
31
23
32
30
September
28.0
28
27
29
26
October
20.2
22
21
17
19
November
13.9
16
14
15
17
December
10.4
11
8
16
10
Average
18.6
12.9
20.7
16.9
20.0
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
-3.1
0
-1
-6
-2
-2
February
-3.7
1
0
-5
-8
-3
March
3.1
5
2
3
5
5
April
7.2
10
7
5
7
6
May
12.9
13
0
11
12
June
17.8
17
18
18
July
20.3
20
21
20
21
August
18.5
21
14
20
18
September
15.9
16
14
16
15
October
8.4
10
7
12
7
November
2.2
3
2
4
5
December
-1.8
2
1
2
-2
Average
7.6
4.0
9.0
5.0
8.8
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
11.9
26
13
8
13
13
February
11.7
5
12
18
26
13
March
10.6
8
17
13
11
10
April
9.0
9
2
16
11
8
May
7.6
6
21
15
8
June
4.2
5
5
3
July
3.0
3
4
2
4
August
3.5
4
2
1
2
September
2.7
2
3
2
3
October
9.8
11
8
3
14
November
7.4
6
5
0
9
December
8.3
17
11
4
6
Average
7.7
11.0
7.5
8.8
7.9
7.3
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
6.4
5
5
7
6
7
February
7.0
7
7
7
6
6
March
7.6
8
8
8
8
7
April
7.7
8
8
8
7
6
May
6.1
5
9
6
6
June
5.2
4
5
6
July
4.7
5
5
4
5
August
4.8
5
4
6
5
September
4.8
4
5
6
5
October
6.1
6
6
4
6
November
6.4
6
7
7
7
December
6.6
7
6
7
6
Average
6.2
7.3
5.8
6.4
6.0
5.9
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
224°
246°
256°
237°
198°
February
219°
224°
239°
008°
221°
March
197°
191°
225°
171°
185°
April
215°
215°
203°
215°
216°
May
151°
247°
158°
183°
June
197°
193°
192°
July
224°
233°
205°
180°
August
175°
190°
183°
141°
September
158°
172°
187°
188°
October
203°
233°
302°
188°
November
205°
212°
232°
200°
December
230°
202°
211°
231°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.