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
85.6
75
85
84
94
91
February
84.3
90
91
76
76
86
March
86.9
82
88
81
91
87
April
87.3
80
93
93
87
May
88.0
96
82
94
93
June
90.9
84
94
88
98
July
93.0
90
93
89
96
August
94.3
91
93
97
97
September
90.2
73
93
94
97
October
83.8
82
81
92
81
November
93.5
96
88
99
90
December
85.8
77
84
92
91
Average
88.2
82.2
85.8
87.2
91.5
91.6
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
5.4
6
9
3
4
8
February
7.8
8
9
8
4
8
March
10.8
13
11
12
12
13
April
16.5
19
16
17
14
May
21.7
22
22
22
21
June
26.3
25
26
28
27
July
29.4
30
30
28
31
August
28.4
27
30
28
28
September
24.6
24
25
25
24
October
18.9
19
17
20
18
November
12.2
12
14
12
16
December
7.6
10
8
10
7
Average
16.4
8.8
18.1
17.9
17.6
17.8
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
-4
-1
1
February
0.6
2
2
-1
-1
1
March
2.9
5
4
3
4
4
April
7.6
10
8
8
5
May
12.3
13
14
12
10
June
17.4
17
18
19
16
July
21.3
22
23
20
22
August
20.3
20
22
22
21
September
17.4
18
17
18
15
October
12.1
12
11
13
11
November
5.4
5
7
5
8
December
2.0
5
2
4
1
Average
9.0
2.5
11.0
10.3
10.3
9.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
12.0
23
15
18
2
7
February
11.2
9
7
19
21
11
March
11.6
20
14
12
6
10
April
10.2
13
8
10
14
May
9.4
6
14
9
5
June
4.8
5
4
5
3
July
6.0
8
5
8
5
August
5.5
8
4
6
5
September
9.6
29
9
4
2
October
10.0
17
12
2
15
November
6.4
2
12
3
10
December
11.5
14
17
4
12
Average
9.6
17.4
11.5
10.4
6.5
7.8
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
4.7
5
5
5
6
5
February
4.5
5
5
5
5
5
March
5.5
6
6
6
6
6
April
5.0
4
6
5
6
May
3.5
3
4
4
2
June
3.0
4
4
3
1
July
2.9
2
3
3
3
August
3.2
3
3
3
4
September
3.4
5
4
2
4
October
3.5
4
4
4
4
November
3.8
4
5
4
5
December
4.3
4
5
5
6
Average
4.0
5.3
3.9
4.5
4.0
3.9
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
339°
289°
307°
306°
285°
February
318°
301°
297°
337°
279°
March
341°
299°
295°
295°
032°
April
028°
301°
276°
314°
May
022°
061°
351°
285°
June
038°
315°
258°
243°
July
271°
338°
001°
298°
August
353°
317°
035°
311°
September
044°
337°
307°
010°
October
321°
040°
039°
013°
November
299°
281°
288°
278°
December
331°
357°
294°
284°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.