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
87.4
85
80
93
86
88
February
80.2
91
84
81
78
81
March
78.7
90
93
91
84
83
April
79.7
90
90
98
92
May
77.8
94
93
86
92
June
88.6
92
93
83
94
July
89.3
88
87
80
92
August
86.0
94
53
86
89
September
93.4
96
91
93
89
October
91.1
98
94
86
89
November
91.6
96
89
89
93
December
83.9
87
75
78
91
Average
85.9
88.6
91.1
86.1
85.7
89.5
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
13.8
11
16
14
14
16
February
17.6
18
18
18
14
16
March
21.3
21
21
22
24
23
April
24.9
22
25
25
24
May
29.5
27
31
29
29
June
32.6
31
35
31
33
July
34.5
32
36
34
35
August
31.8
33
18
34
35
September
31.8
30
29
31
31
October
25.8
25
23
27
27
November
18.9
19
18
19
22
December
15.5
15
15
19
15
Average
23.9
16.5
24.2
24.0
25.1
25.5
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
1.5
-1
4
-1
2
4
February
4.2
3
6
1
1
4
March
6.9
7
6
4
11
11
April
8.9
10
9
8
8
May
14.5
14
16
14
13
June
18.2
18
17
18
19
July
20.8
21
21
21
21
August
18.4
17
11
21
21
September
16.8
17
14
18
16
October
10.7
9
7
13
11
November
3.6
4
5
1
5
December
3.1
1
7
7
-1
Average
9.8
3.1
10.6
9.4
11.1
11.0
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
0
0
16
February
3.4
8
11
0
0
11
March
1.7
9
5
0
0
0
April
1.1
8
0
0
0
May
0.5
3
0
0
0
June
0.6
3
0
0
0
July
0.5
2
0
0
0
August
1.5
3
4
0
0
September
0.7
2
3
0
0
October
2.1
2
1
0
0
November
2.5
5
8
0
0
December
4.0
4
17
0
0
Average
2.6
9.5
4.4
2.0
1.9
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
3.3
5
4
4
3
3
February
3.2
5
5
3
4
5
March
3.7
4
5
4
4
4
April
3.4
5
3
3
4
May
2.2
4
2
2
3
June
1.7
3
2
2
2
July
1.2
2
1
1
1
August
1.2
3
1
1
2
September
2.0
3
3
1
4
October
2.5
4
4
2
2
November
2.5
4
4
3
3
December
2.4
4
4
2
3
Average
2.6
4.4
3.7
2.7
2.3
3.0
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
318°
277°
333°
301°
003°
February
348°
301°
338°
342°
306°
March
340°
318°
252°
007°
315°
April
345°
261°
287°
321°
May
011°
229°
085°
323°
June
315°
350°
053°
046°
July
304°
264°
240°
289°
August
337°
300°
048°
012°
September
033°
019°
017°
041°
October
337°
360°
284°
354°
November
005°
350°
342°
351°
December
315°
295°
318°
283°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.