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
87.9
70
92
92
91
93
February
91.7
89
99
93
89
94
March
96.3
89
95
100
97
98
April
98.2
97
97
99
99
May
98.4
100
97
100
98
June
98.7
99
97
100
98
July
99.8
100
100
100
99
August
97.8
97
99
95
99
September
96.0
100
99
99
90
October
97.3
93
98
97
97
November
95.2
95
87
99
95
December
83.3
78
69
87
88
Average
94.2
82.5
95.6
94.9
96.2
95.8
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
4.4
5
5
2
6
6
February
7.1
11
7
6
6
9
March
12.7
13
9
15
14
13
April
17.3
17
15
19
18
May
23.2
25
21
23
23
June
28.6
27
28
33
27
July
35.4
36
36
37
33
August
33.8
33
36
32
34
September
27.7
28
31
28
29
October
18.3
20
21
19
20
November
9.8
11
6
12
9
December
3.9
6
1
5
5
Average
17.4
9.2
18.7
18.6
19.6
18.9
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
-3
-2
-5
-1
0
February
-2.2
2
-3
-5
-2
-2
March
1.7
2
0
2
1
2
April
4.6
4
2
4
5
May
9.3
12
7
9
10
June
13.4
14
13
17
13
July
18.2
19
19
21
16
August
17.4
17
19
16
18
September
12.4
13
14
12
13
October
5.6
8
7
7
6
November
0.5
2
-3
3
0
December
-3.6
-1
-5
-2
-4
Average
5.6
0.2
6.9
5.9
7.1
6.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.2
18
5
6
7
10
February
8.9
14
2
5
10
9
March
7.0
11
14
1
3
8
April
5.7
5
10
2
2
May
3.6
1
6
2
5
June
2.8
1
6
2
8
July
0.1
0
0
0
0
August
0.2
1
0
1
0
September
1.7
3
1
1
0
October
3.8
8
1
6
1
November
5.3
5
10
3
10
December
8.9
7
22
13
8
Average
5.5
14.0
4.2
5.1
3.6
4.6
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
6
7
6
7
7
February
8.1
8
8
7
8
8
March
8.1
7
10
9
8
7
April
8.7
9
10
7
8
May
7.3
7
8
8
7
June
7.0
6
7
7
7
July
6.3
6
7
6
7
August
6.3
6
6
7
7
September
6.2
6
6
7
7
October
6.4
6
6
8
7
November
6.1
5
7
6
7
December
6.1
5
5
7
6
Average
7.0
7.1
6.9
6.9
7.2
6.9
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
128°
139°
144°
127°
112°
February
154°
125°
285°
320°
315°
March
251°
145°
309°
301°
295°
April
306°
274°
301°
308°
May
161°
298°
308°
296°
June
312°
326°
309°
313°
July
326°
309°
303°
314°
August
312°
314°
305°
310°
September
313°
302°
304°
331°
October
292°
310°
122°
317°
November
159°
131°
138°
124°
December
130°
215°
137°
162°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.