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
89.0
87
92
90
88
93
February
86.4
88
89
95
68
87
March
90.3
85
91
86
88
93
April
94.1
92
94
94
97
96
May
89.5
92
78
98
91
June
93.3
86
97
93
94
July
96.5
95
98
96
99
August
94.6
93
98
94
92
September
91.0
90
98
96
91
October
90.1
94
93
92
79
November
92.2
93
91
99
92
December
87.0
87
84
92
89
Average
91.2
88.1
91.3
92.0
92.2
91.5
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
9.9
11
14
8
9
11
February
13.3
13
16
14
8
13
March
16.2
18
16
18
17
19
April
21.9
22
23
22
22
20
May
25.6
24
26
26
23
June
29.3
28
30
30
29
July
32.2
32
32
31
34
August
30.7
31
31
31
30
September
28.0
28
29
28
26
October
22.5
23
20
24
22
November
15.9
16
18
16
19
December
11.8
14
11
16
11
Average
20.8
16.1
22.1
21.8
21.4
21.3
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
0.4
1
3
-2
0
2
February
2.4
2
4
1
0
3
March
4.9
7
5
6
5
8
April
9.8
11
11
9
9
8
May
14.6
13
15
12
13
June
18.8
17
19
19
19
July
21.9
23
22
22
23
August
21.1
21
21
22
22
September
17.9
18
17
18
17
October
12.1
12
10
14
12
November
4.5
4
7
4
7
December
2.0
3
2
4
1
Average
10.2
5.1
11.0
10.7
10.7
11.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
11.2
13
13
12
8
7
February
14.0
13
12
12
23
14
March
10.5
15
8
13
14
7
April
7.7
6
8
8
4
10
May
8.2
5
14
5
10
June
5.7
9
3
6
7
July
5.0
2
7
8
2
August
5.2
7
5
5
9
September
7.1
6
4
5
12
October
8.7
6
6
10
16
November
7.4
6
8
4
7
December
10.7
8
15
6
11
Average
8.5
11.4
7.3
8.4
7.7
9.0
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
8.2
9
8
8
8
8
February
8.2
8
9
9
8
9
March
9.2
9
9
10
8
9
April
8.9
9
8
9
9
10
May
8.0
8
8
7
9
June
7.2
7
7
7
8
July
6.8
7
7
7
7
August
6.3
7
6
6
7
September
7.0
7
7
7
7
October
7.0
7
7
7
7
November
7.2
7
7
8
7
December
6.7
6
6
6
8
Average
7.7
8.5
7.5
7.6
7.4
7.7
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
265°
269°
311°
315°
280°
February
270°
250°
232°
323°
254°
March
294°
285°
235°
269°
234°
April
233°
205°
267°
278°
277°
May
025°
011°
281°
317°
June
079°
267°
211°
193°
July
224°
204°
207°
194°
August
244°
194°
153°
210°
September
352°
337°
231°
027°
October
277°
317°
267°
305°
November
331°
252°
293°
222°
December
256°
310°
227°
255°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.