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
87.2
74
91
87
91
90
February
85.8
91
91
88
78
84
March
88.0
81
92
85
87
84
April
90.4
85
89
92
92
92
May
87.1
96
82
97
90
June
91.7
84
94
92
95
July
86.4
89
41
98
96
August
80.0
95
0
95
93
September
75.0
90
0
96
89
October
81.3
94
38
89
81
November
91.8
95
90
99
91
December
84.3
78
74
96
92
Average
85.6
82.5
90.3
62.8
92.6
89.9
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
6.2
6
10
4
5
8
February
9.7
10
12
10
5
10
March
12.8
14
13
15
14
16
April
18.7
19
22
18
19
16
May
23.6
22
24
23
21
June
27.9
27
28
29
28
July
30.8
31
31
31
32
August
29.3
29
30
30
29
September
25.7
26
25
26
24
October
20.2
21
18
22
20
November
12.9
13
14
12
17
December
8.4
10
7
12
8
Average
18.1
12.5
19.6
19.0
19.1
19.0
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
-3.9
-2
1
-5
-2
0
February
-1.7
0
1
-2
-2
0
March
1.8
4
2
2
3
5
April
7.0
8
9
6
7
6
May
12.2
10
13
10
11
June
16.6
14
17
18
17
July
19.8
20
20
19
21
August
19.0
19
19
20
20
September
15.4
15
15
15
14
October
9.7
8
7
12
10
November
2.3
1
4
1
5
December
-1.6
1
-1
2
-1
Average
7.7
2.4
8.3
8.2
8.7
8.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.7
28
13
14
6
7
February
11.7
11
9
11
19
13
March
9.7
12
12
13
9
9
April
8.8
11
11
10
6
10
May
8.5
7
10
9
7
June
5.0
10
4
6
3
July
3.1
2
2
1
3
August
4.0
3
0
4
9
September
5.5
6
0
7
2
October
5.7
4
2
6
9
November
7.7
8
10
4
7
December
11.7
11
15
3
12
Average
8.0
14.9
7.5
7.0
6.3
7.2
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
6.8
7
7
6
6
7
February
6.5
6
7
8
6
6
March
7.3
7
7
8
7
6
April
7.0
6
6
7
7
7
May
4.8
4
5
5
6
June
4.7
4
5
5
5
July
3.9
4
4
4
4
August
3.4
4
2
3
4
September
3.5
4
3
5
3
October
5.0
5
4
5
5
November
6.2
5
7
6
7
December
5.7
5
5
5
7
Average
5.4
6.4
5.0
5.0
5.3
5.4
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
287°
274°
280°
298°
281°
February
251°
261°
249°
281°
259°
March
282°
286°
253°
273°
213°
April
254°
244°
274°
279°
281°
May
249°
214°
273°
264°
June
272°
261°
222°
242°
July
227°
242°
237°
257°
August
253°
242°
207°
249°
September
284°
281°
248°
215°
October
279°
222°
267°
230°
November
276°
250°
285°
253°
December
276°
271°
237°
270°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.