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
89.5
94
87
96
83
93
February
87.1
99
89
90
72
95
March
91.2
90
92
91
92
89
April
95.4
97
94
97
100
98
May
93.1
93
96
98
87
June
94.8
95
96
89
96
July
93.9
95
93
91
97
August
91.0
94
90
93
87
September
94.1
95
96
93
91
October
92.3
97
94
96
88
November
90.6
95
93
98
91
December
88.6
94
93
88
87
Average
92.3
94.9
93.4
93.7
91.4
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
13.2
14
15
11
11
15
February
16.5
16
18
17
13
15
March
19.4
21
19
21
19
20
April
24.2
25
24
24
24
23
May
28.0
25
29
28
25
June
30.8
29
32
29
29
July
32.2
32
31
31
33
August
31.4
33
31
31
31
September
29.2
28
28
29
27
October
24.5
24
22
25
25
November
17.9
18
19
17
20
December
14.8
16
13
18
13
Average
23.0
18.5
23.3
23.5
23.0
22.9
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
2.6
2
4
0
3
5
February
5.1
3
7
4
3
5
March
7.2
8
7
7
7
10
April
10.6
11
10
9
9
10
May
15.3
14
17
11
14
June
19.8
17
20
20
20
July
21.5
22
22
21
22
August
20.8
21
19
22
22
September
17.8
17
17
16
17
October
11.9
10
9
12
13
November
5.4
5
8
3
8
December
3.8
4
4
5
2
Average
11.2
6.0
11.5
11.4
11.0
12.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.8
7
8
5
11
7
February
8.4
6
5
7
16
11
March
5.6
7
7
6
3
8
April
4.7
3
7
3
2
4
May
3.8
7
1
2
6
June
3.1
2
1
4
5
July
2.1
2
1
4
3
August
3.1
3
4
4
3
September
2.8
1
4
3
5
October
3.2
3
1
2
3
November
6.4
7
5
4
6
December
8.8
4
5
7
7
Average
4.8
5.4
4.6
3.3
4.8
5.4
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
5.5
7
5
5
4
6
February
5.9
6
6
6
6
6
March
6.3
6
6
7
6
6
April
6.0
6
6
6
6
7
May
5.5
7
5
6
6
June
4.8
5
4
5
5
July
4.0
3
4
3
4
August
3.3
4
1
3
3
September
4.0
5
2
4
5
October
4.1
5
2
4
4
November
4.2
4
3
4
5
December
4.5
5
4
4
5
Average
5.0
6.2
5.1
4.2
4.5
5.0
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
248°
247°
322°
291°
295°
February
266°
234°
246°
342°
248°
March
296°
273°
226°
014°
222°
April
228°
192°
236°
260°
258°
May
008°
245°
247°
017°
June
221°
134°
179°
226°
July
209°
201°
195°
201°
August
187°
199°
154°
181°
September
013°
020°
126°
034°
October
328°
329°
283°
043°
November
011°
045°
334°
025°
December
279°
041°
229°
295°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.