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
79.4
67
79
87
78
82
February
86.0
94
95
82
93
78
March
87.8
87
84
88
94
83
April
95.3
92
94
98
96
May
94.0
98
93
94
96
June
94.1
86
99
95
96
July
94.2
91
93
93
96
August
94.0
91
91
96
95
September
94.6
93
94
96
95
October
91.1
93
95
87
87
November
91.5
94
93
94
94
December
86.4
82
74
87
94
Average
90.2
82.4
90.3
91.0
92.5
91.6
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
4.0
4
7
3
4
6
February
8.2
12
12
6
2
6
March
12.7
15
13
15
16
14
April
18.5
20
18
19
17
May
24.7
25
26
23
22
June
29.1
29
31
29
30
July
30.1
30
31
29
32
August
28.9
29
29
31
29
September
27.2
28
26
28
26
October
20.4
21
21
22
19
November
11.9
15
14
11
16
December
7.9
10
7
12
7
Average
17.6
9.5
20.3
19.2
18.9
18.6
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
-4.8
-3
2
-6
-2
0
February
-2.6
0
1
-4
-5
-2
March
2.3
5
2
3
3
5
April
6.9
6
7
7
6
May
13.7
13
15
12
13
June
18.0
17
17
19
19
July
20.0
20
21
20
21
August
18.4
19
19
20
18
September
15.3
15
15
16
14
October
9.3
10
8
13
8
November
1.9
2
3
1
5
December
-1.4
3
0
2
-2
Average
7.5
0.2
9.2
8.5
9.0
8.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
13.1
15
20
11
14
12
February
10.2
4
6
20
9
15
March
11.0
7
14
10
8
11
April
8.5
7
11
9
8
May
7.9
6
10
8
10
June
6.2
5
11
8
3
July
4.3
2
9
4
4
August
3.7
5
5
1
3
September
3.9
1
3
7
2
October
11.3
18
4
10
6
November
6.8
3
7
6
8
December
10.2
10
7
12
9
Average
8.0
9.0
7.2
8.9
7.6
7.2
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
9.2
10
10
10
9
8
February
9.7
9
11
10
9
9
March
10.6
11
12
11
10
10
April
10.2
10
11
10
10
May
8.8
8
9
8
9
June
7.5
6
7
8
8
July
5.8
5
7
5
6
August
5.5
5
6
5
5
September
5.8
4
6
7
6
October
7.9
7
9
8
8
November
8.8
8
10
9
10
December
8.9
9
9
10
9
Average
8.3
9.9
7.6
8.5
8.0
8.0
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
236°
237°
265°
214°
221°
February
217°
223°
220°
326°
264°
March
237°
229°
229°
182°
239°
April
224°
208°
239°
258°
May
065°
181°
205°
199°
June
036°
235°
205°
211°
July
239°
221°
229°
230°
August
227°
231°
183°
232°
September
045°
269°
217°
205°
October
246°
211°
208°
203°
November
220°
218°
219°
223°
December
216°
192°
200°
231°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.