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
75.3
67
76
54
74
82
February
74.9
75
85
69
70
76
March
86.6
86
78
86
93
87
April
91.6
88
86
95
93
May
91.4
94
88
90
93
June
93.4
91
90
94
93
July
93.6
96
90
85
96
August
91.5
94
96
94
91
September
89.6
93
88
97
69
October
77.9
74
70
87
75
November
74.9
70
76
69
83
December
69.1
51
68
65
81
Average
84.2
76.0
83.0
81.2
85.4
85.5
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
8.3
9
8
9
9
9
February
8.2
10
8
9
7
10
March
12.0
13
11
13
12
11
April
15.1
14
13
18
17
May
20.4
23
17
19
20
June
23.1
24
22
26
22
July
27.0
28
28
27
25
August
27.5
29
29
27
27
September
23.0
23
25
23
24
October
16.3
18
20
15
16
November
10.4
12
9
11
10
December
8.0
11
5
6
9
Average
15.9
10.5
17.2
16.9
16.7
16.6
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
2.2
3
2
2
3
4
February
0.9
3
1
0
2
1
March
1.5
3
0
4
1
1
April
3.8
4
2
3
3
May
7.4
8
6
7
8
June
9.6
9
10
11
10
July
11.2
10
12
11
11
August
11.9
13
12
12
11
September
9.8
9
10
10
11
October
5.5
6
6
7
7
November
2.9
3
-1
5
3
December
2.1
5
0
2
2
Average
5.3
2.6
5.8
5.6
6.0
6.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
23.2
29
20
14
23
42
February
22.3
23
20
12
34
15
March
16.6
15
18
13
18
15
April
18.6
27
24
5
5
May
9.3
5
24
5
10
June
7.0
6
11
9
10
July
1.5
2
1
0
1
August
1.7
5
2
0
2
September
6.8
9
0
8
7
October
11.7
14
9
13
8
November
20.6
14
19
33
25
December
19.7
23
13
23
18
Average
13.6
21.9
13.1
11.9
12.9
12.1
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
5
5
5
5
8
February
5.9
5
7
5
7
6
March
5.8
6
6
5
6
6
April
6.3
6
7
6
6
May
5.0
5
6
6
6
June
5.1
5
5
5
6
July
4.5
4
4
4
5
August
4.9
5
6
6
5
September
5.2
5
5
6
5
October
5.3
4
5
6
6
November
5.5
4
5
7
7
December
4.9
4
4
6
6
Average
5.3
5.5
4.9
5.1
5.5
5.8
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
204°
172°
205°
194°
205°
February
202°
210°
202°
216°
216°
March
192°
202°
220°
205°
215°
April
208°
224°
248°
224°
May
253°
227°
235°
232°
June
239°
232°
267°
228°
July
243°
242°
252°
224°
August
312°
250°
241°
246°
September
223°
016°
225°
341°
October
168°
207°
204°
231°
November
210°
192°
206°
205°
December
204°
189°
198°
204°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.