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
88.4
72
93
90
90
84
February
88.5
89
97
90
78
94
March
91.9
86
92
96
89
84
April
93.2
87
98
95
96
May
92.8
92
86
90
99
June
96.9
99
96
93
100
July
97.4
94
97
100
96
August
97.8
99
100
100
97
September
95.4
96
98
100
94
October
91.9
90
97
97
86
November
90.9
87
82
98
94
December
90.0
84
70
97
91
Average
92.1
82.3
92.4
92.5
94.1
93.1
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
9.6
7
11
11
8
11
February
11.6
17
13
12
4
11
March
17.7
19
16
19
19
18
April
21.9
23
24
21
22
May
26.4
26
28
24
26
June
32.7
31
34
32
34
July
34.6
34
38
33
34
August
33.3
35
35
34
32
September
30.7
32
33
33
28
October
22.6
23
25
25
22
November
15.9
17
14
18
18
December
11.8
13
11
18
11
Average
21.5
14.3
22.8
24.1
22.6
22.1
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
-3.2
-4
-1
-6
-1
-1
February
-2.5
3
-1
-4
-6
-1
March
4.3
6
3
3
5
6
April
7.9
7
9
8
7
May
14.3
15
16
14
14
June
19.5
19
21
19
19
July
21.8
21
24
21
22
August
21.0
21
21
22
20
September
17.9
18
17
18
15
October
9.7
10
10
12
8
November
3.2
4
2
4
5
December
-1.8
2
1
1
-2
Average
8.6
1.3
9.9
9.7
9.9
9.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.7
8
8
6
3
5
February
9.5
6
4
14
21
8
March
5.3
3
4
8
8
8
April
4.6
10
1
4
2
May
10.5
8
11
7
10
June
3.7
2
4
5
6
July
2.4
3
6
2
3
August
3.6
1
3
1
2
September
5.1
3
0
0
5
October
5.5
8
3
1
6
November
5.5
7
13
1
1
December
3.7
1
2
0
6
Average
5.4
5.5
5.0
5.7
4.1
4.9
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
10.9
10
10
11
12
11
February
11.4
12
12
12
10
11
March
12.8
12
13
14
14
11
April
13.3
13
16
13
12
May
10.6
8
13
10
10
June
11.0
8
12
10
13
July
9.2
9
10
9
10
August
8.9
8
8
10
9
September
10.2
9
10
11
9
October
11.5
12
11
11
11
November
11.0
10
12
11
12
December
10.4
11
10
11
10
Average
11.0
11.3
10.2
11.7
10.9
10.7
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
026°
282°
358°
313°
010°
February
223°
228°
340°
005°
343°
March
192°
354°
312°
182°
140°
April
182°
170°
155°
166°
May
147°
144°
113°
073°
June
123°
161°
160°
173°
July
161°
162°
159°
141°
August
159°
148°
164°
134°
September
144°
161°
167°
160°
October
061°
218°
189°
153°
November
172°
159°
183°
184°
December
246°
209°
180°
308°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.