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
92.5
84
91
96
85
96
February
93.3
93
94
95
84
90
March
93.9
92
98
98
97
87
April
95.4
95
96
98
95
93
May
95.8
94
99
91
98
June
97.2
93
94
99
99
July
99.2
100
100
97
100
August
98.2
100
96
98
100
September
95.8
99
99
100
97
October
92.3
93
94
98
89
November
92.1
91
91
97
95
December
93.9
91
90
97
99
Average
94.7
91.1
94.9
96.1
94.9
95.2
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
13.2
11
14
14
11
15
February
15.9
18
16
14
11
14
March
21.0
21
21
21
21
21
April
25.4
26
25
28
23
25
May
29.9
28
33
27
31
June
33.9
34
34
33
34
July
35.0
36
38
32
36
August
34.0
37
33
32
36
September
30.5
33
31
32
29
October
23.7
24
23
27
25
November
18.4
19
15
20
21
December
15.0
15
14
20
15
Average
24.0
18.9
25.2
25.1
24.1
25.1
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
-2.2
-3
0
-5
-1
0
February
-1.6
3
1
-4
-4
-1
March
4.9
6
4
2
5
7
April
8.7
10
8
10
8
8
May
14.7
15
16
14
15
June
19.6
19
20
20
20
July
21.5
23
24
20
23
August
21.1
22
21
21
21
September
17.2
19
18
17
14
October
9.5
11
10
11
8
November
3.6
5
3
4
6
December
0.0
0
2
3
-2
Average
9.2
3.8
10.4
10.0
9.8
9.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.3
12
7
4
6
3
February
5.7
6
3
7
18
5
March
2.9
4
1
3
0
7
April
2.7
4
0
0
6
3
May
3.0
8
0
5
1
June
1.3
2
2
3
0
July
1.2
2
0
1
1
August
1.7
1
6
1
1
September
3.4
3
0
1
4
October
5.4
4
11
1
8
November
4.1
5
5
3
5
December
4.2
8
4
2
0
Average
3.5
6.5
3.6
3.4
3.7
2.9
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
11.3
10
13
10
11
11
February
12.7
13
15
12
11
12
March
12.6
12
13
13
14
12
April
13.2
14
13
14
13
12
May
12.3
10
13
13
11
June
11.2
10
12
10
13
July
9.2
10
10
8
9
August
8.9
9
8
9
10
September
9.2
8
9
10
8
October
10.4
10
9
11
12
November
11.1
10
12
10
12
December
10.9
11
10
12
12
Average
11.2
12.2
10.9
11.0
10.9
11.1
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
260°
265°
296°
308°
274°
February
268°
248°
296°
330°
294°
March
234°
229°
279°
213°
226°
April
256°
221°
221°
138°
233°
May
146°
213°
146°
175°
June
155°
164°
164°
177°
July
176°
179°
162°
176°
August
165°
138°
179°
172°
September
184°
184°
184°
080°
October
179°
210°
239°
200°
November
245°
222°
245°
219°
December
262°
233°
247°
308°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.