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
83.8
72
79
82
96
93
February
82.7
84
80
76
81
85
March
87.1
83
92
77
89
88
April
88.4
79
93
95
91
May
90.4
94
87
94
88
June
91.6
93
90
92
93
July
93.9
90
98
90
96
August
93.5
93
93
89
100
September
91.1
81
94
96
92
October
89.0
90
85
87
89
November
93.4
96
92
96
89
December
84.4
75
81
87
90
Average
88.5
80.2
87.3
88.0
91.2
91.1
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
3.9
4
7
2
3
6
February
6.0
7
7
6
3
6
March
9.3
12
10
10
11
11
April
15.1
18
15
16
12
May
21.1
22
23
21
20
June
25.8
25
25
28
27
July
29.2
30
30
27
30
August
28.0
27
30
28
29
September
23.9
24
24
24
24
October
18.4
19
18
20
17
November
11.0
11
14
11
14
December
6.0
8
8
8
6
Average
15.3
7.3
17.1
17.2
16.6
16.5
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
-5.6
-2
0
-8
-5
-3
February
-4.5
-3
-4
-5
-6
-2
March
-1.5
2
0
0
-1
1
April
4.6
6
4
4
3
May
9.7
7
12
9
9
June
14.4
14
14
16
15
July
18.7
20
19
18
20
August
17.7
17
19
18
19
September
13.7
14
13
15
13
October
8.2
9
7
10
8
November
0.4
0
3
0
2
December
-3.6
0
-1
-1
-3
Average
5.4
-2.9
7.0
6.6
6.5
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
13.2
24
19
13
7
8
February
14.3
14
14
22
19
13
March
13.8
23
15
15
12
9
April
13.6
14
13
10
17
May
8.9
7
6
7
8
June
5.2
3
6
4
2
July
4.6
4
3
7
3
August
5.2
8
3
6
5
September
7.8
17
5
10
3
October
11.2
13
13
8
12
November
9.7
5
10
6
14
December
13.0
14
18
7
11
Average
10.8
20.2
10.5
9.6
8.4
8.4
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
5
5
7
7
7
February
6.6
7
6
7
6
6
March
7.7
8
8
7
8
7
April
7.4
6
8
8
9
May
6.2
6
6
6
7
June
5.5
5
6
6
5
July
4.8
5
5
4
5
August
4.9
5
5
4
5
September
5.2
5
5
6
6
October
5.5
5
5
5
5
November
6.1
5
6
6
6
December
5.6
5
7
5
7
Average
6.1
6.7
5.4
6.2
5.8
6.2
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
321°
319°
311°
322°
281°
February
316°
306°
266°
328°
273°
March
331°
314°
287°
288°
305°
April
214°
295°
307°
310°
May
284°
129°
311°
265°
June
227°
221°
189°
205°
July
193°
203°
273°
188°
August
229°
207°
197°
173°
September
355°
312°
294°
277°
October
288°
349°
344°
324°
November
320°
273°
304°
266°
December
313°
330°
309°
306°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.