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
76.5
58
67
84
84
86
February
85.1
90
84
80
88
85
March
87.9
89
82
88
98
82
April
91.1
91
90
90
95
90
May
93.8
99
92
96
94
June
93.1
81
98
96
99
July
93.7
87
96
92
86
August
95.6
96
94
97
97
September
93.2
86
97
95
94
October
90.7
89
96
86
93
November
90.1
98
84
93
92
December
84.5
75
91
81
90
Average
89.4
82.6
86.4
91.2
92.2
91.1
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
1.9
1
5
-1
2
4
February
4.9
9
8
3
-1
3
March
9.7
13
9
12
14
10
April
15.6
18
18
15
17
14
May
21.9
22
24
22
20
June
27.4
27
29
28
28
July
29.3
29
29
28
31
August
27.9
27
28
29
29
September
24.8
24
24
25
24
October
18.2
19
18
20
17
November
9.8
12
12
10
13
December
5.4
9
5
8
5
Average
15.6
10.2
17.4
16.9
16.8
16.3
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
-5.5
-4
-1
-9
-3
-2
February
-4.3
-1
-2
-6
-9
-4
March
0.2
3
1
1
1
2
April
5.2
8
6
5
5
4
May
11.5
10
14
10
10
June
16.8
14
18
18
17
July
19.5
20
20
20
20
August
17.8
18
19
19
18
September
15.3
16
15
16
13
October
8.9
10
7
13
7
November
1.4
2
3
1
4
December
-2.7
3
0
1
-2
Average
6.5
1.5
8.1
7.4
7.6
7.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
13.0
23
17
12
6
10
February
10.2
5
11
18
12
11
March
9.7
8
19
13
4
8
April
8.1
9
12
11
7
6
May
6.5
4
11
8
7
June
4.1
6
2
8
1
July
3.8
6
4
12
1
August
3.0
4
3
3
3
September
4.1
4
5
7
2
October
7.7
10
4
10
7
November
8.3
5
13
6
11
December
8.8
14
2
6
13
Average
7.4
10.9
8.7
7.8
7.3
6.0
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
9.5
9
8
10
8
9
February
10.0
9
12
11
9
10
March
10.5
11
11
11
11
10
April
10.2
11
10
11
10
10
May
8.9
8
9
8
9
June
8.4
8
8
9
8
July
6.9
6
8
7
7
August
6.9
7
7
6
7
September
7.2
6
7
9
8
October
9.0
9
10
8
9
November
9.4
9
10
10
11
December
8.9
8
9
9
9
Average
8.9
10.1
8.3
9.0
8.5
8.7
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
236°
249°
248°
255°
239°
February
237°
238°
235°
258°
256°
March
235°
266°
248°
241°
255°
April
257°
245°
241°
244°
258°
May
034°
171°
270°
290°
June
024°
260°
220°
264°
July
246°
243°
263°
239°
August
260°
215°
220°
272°
September
065°
265°
243°
227°
October
259°
233°
240°
235°
November
236°
227°
235°
238°
December
235°
231°
222°
243°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.