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
80.9
72
76
88
93
70
February
80.7
91
80
79
75
82
March
91.9
90
90
94
90
84
April
92.5
90
90
96
92
May
94.3
96
91
97
95
June
94.7
96
93
89
97
July
96.5
92
96
98
98
August
94.4
98
89
97
95
September
94.6
96
94
95
90
October
90.1
85
96
94
84
November
88.6
89
83
97
90
December
82.4
93
56
86
87
Average
89.9
83.8
90.1
88.5
92.5
89.1
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
10.9
8
14
11
11
11
February
14.1
18
16
13
7
13
March
18.9
20
18
19
20
19
April
22.4
23
23
22
22
May
27.6
28
28
26
26
June
31.6
32
32
31
31
July
33.6
33
35
33
34
August
32.7
35
32
34
32
September
30.5
32
31
31
28
October
23.9
24
25
25
21
November
16.9
18
16
17
20
December
13.6
15
12
18
13
Average
22.1
15.3
23.8
23.5
23.0
22.4
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
0.2
-3
3
-3
0
3
February
2.7
4
5
-1
-2
3
March
6.8
8
7
5
7
10
April
9.5
10
10
8
9
May
15.6
15
17
14
14
June
20.0
20
19
21
19
July
22.1
22
24
20
22
August
21.5
22
20
23
21
September
16.4
16
15
17
18
October
10.4
12
8
14
10
November
3.8
4
4
3
5
December
2.6
2
4
7
0
Average
10.1
3.1
11.4
10.4
11.0
11.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.2
24
10
11
5
11
February
13.9
12
20
14
15
11
March
8.0
11
13
9
4
11
April
7.1
8
9
6
6
May
5.7
4
7
6
4
June
4.8
4
7
7
5
July
3.4
7
4
2
2
August
4.0
3
7
2
5
September
3.9
4
5
2
7
October
6.7
12
2
5
7
November
5.8
9
5
3
3
December
8.0
4
19
5
11
Average
7.5
15.9
8.0
7.9
4.8
6.5
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
6.2
6
6
6
7
6
February
6.6
7
7
6
6
7
March
7.1
6
7
7
7
7
April
6.8
7
8
6
6
May
6.0
6
7
6
6
June
5.2
5
5
5
5
July
5.0
5
5
5
5
August
4.9
5
5
6
5
September
4.7
5
5
5
5
October
5.6
6
6
6
5
November
5.2
5
5
5
5
December
5.7
6
5
7
6
Average
5.8
6.4
5.8
5.9
5.7
5.5
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
330°
253°
342°
264°
217°
February
230°
236°
270°
032°
326°
March
180°
115°
209°
126°
160°
April
164°
165°
201°
207°
May
124°
194°
118°
131°
June
001°
179°
159°
181°
July
229°
177°
235°
184°
August
102°
130°
128°
045°
September
093°
051°
097°
046°
October
277°
217°
220°
054°
November
042°
176°
196°
186°
December
249°
078°
207°
243°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.