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
78.2
52
81
90
85
69
February
87.8
89
97
88
78
94
March
86.8
89
86
86
88
78
April
92.4
89
97
91
94
92
May
88.6
89
81
92
78
June
97.6
97
96
96
99
July
96.5
97
95
95
96
August
95.3
96
96
97
96
September
91.8
94
93
96
86
October
92.8
92
97
95
94
November
89.5
82
87
99
88
December
86.6
73
65
97
94
Average
89.6
79.6
90.4
89.6
92.8
88.7
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
9.0
15
12
9
2
9
March
15.2
18
14
16
17
16
April
20.4
23
22
21
20
19
May
24.3
26
25
22
22
June
30.5
31
30
31
32
July
32.4
33
34
32
32
August
31.6
35
34
33
31
September
28.8
31
30
30
27
October
20.8
22
23
23
19
November
13.8
15
13
16
17
December
9.9
10
8
15
10
Average
19.5
14.1
21.5
21.3
20.7
20.0
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
-3
-6
-2
-3
February
-4.4
1
-3
-5
-9
-3
March
2.8
4
2
2
5
5
April
7.0
9
7
8
7
6
May
13.4
13
14
13
12
June
18.9
18
20
20
20
July
20.5
21
22
21
22
August
19.5
20
20
21
19
September
16.3
16
15
17
14
October
8.2
9
8
11
7
November
1.4
2
0
3
4
December
-2.3
1
-1
1
-2
Average
7.4
1.5
8.6
8.3
9.1
8.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.3
18
4
7
7
4
February
6.6
9
5
9
16
6
March
7.1
5
9
16
8
4
April
5.5
5
2
3
5
8
May
8.0
7
15
12
10
June
2.7
3
5
5
2
July
2.4
1
4
3
4
August
2.8
2
2
1
1
September
4.1
5
3
3
4
October
7.0
9
4
9
4
November
6.1
12
6
0
2
December
4.2
12
2
0
3
Average
5.6
9.2
5.9
6.5
5.7
4.4
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
9.8
9
9
10
10
10
February
10.7
11
11
11
11
10
March
11.9
13
12
12
13
10
April
12.4
14
13
14
12
10
May
9.3
8
11
9
9
June
8.9
6
8
8
11
July
7.5
8
7
7
8
August
7.5
7
5
9
8
September
8.9
9
7
9
9
October
10.2
11
9
10
11
November
10.1
9
11
10
12
December
9.8
10
10
10
9
Average
9.9
11.5
9.3
9.4
9.8
9.6
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
296°
288°
300°
292°
273°
February
223°
208°
302°
010°
323°
March
202°
295°
311°
168°
182°
April
194°
211°
189°
231°
245°
May
151°
140°
143°
079°
June
123°
168°
178°
181°
July
154°
138°
153°
149°
August
231°
126°
167°
158°
September
155°
154°
183°
180°
October
243°
218°
247°
204°
November
175°
238°
214°
201°
December
235°
197°
206°
293°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.