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
75.0
58
69
86
80
79
February
84.7
94
83
80
89
86
March
87.0
88
79
88
99
84
April
91.4
90
91
96
92
May
93.3
100
93
95
92
June
93.1
83
97
91
99
July
96.4
94
98
91
98
August
95.8
95
95
97
97
September
93.6
92
98
95
92
October
89.4
94
94
79
95
November
88.1
92
90
89
89
December
82.7
71
92
85
82
Average
88.8
80.1
87.3
92.1
91.0
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
1.1
0
4
-2
1
3
February
4.0
8
6
2
-1
3
March
8.7
11
7
9
13
10
April
14.5
16
13
16
13
May
21.5
22
23
21
19
June
26.8
26
27
28
28
July
29.0
28
29
28
30
August
27.8
26
29
29
28
September
24.2
23
24
25
23
October
17.2
17
18
19
15
November
8.9
10
11
9
13
December
4.6
8
4
6
4
Average
14.6
6.2
16.0
16.1
16.2
15.7
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
-6.9
-5
-1
-10
-4
-2
February
-5.5
-2
-3
-7
-9
-4
March
-1.6
2
-1
-1
1
1
April
4.4
5
4
5
3
May
10.8
9
13
10
10
June
16.4
15
16
18
16
July
19.1
19
19
19
20
August
18.2
17
19
20
18
September
14.8
15
15
14
13
October
8.5
9
7
12
7
November
1.1
1
2
0
3
December
-2.5
2
-1
0
-2
Average
5.8
-2.4
7.3
6.5
7.2
6.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
23.8
41
29
18
18
20
February
17.5
6
17
28
19
15
March
14.8
17
25
15
3
8
April
12.5
15
13
13
10
May
9.3
5
10
10
11
June
5.8
9
3
7
3
July
4.8
7
5
11
1
August
4.0
5
5
2
5
September
5.3
3
6
7
3
October
10.2
11
5
15
9
November
14.0
12
19
14
13
December
15.6
25
11
10
16
Average
12.0
21.5
12.9
10.9
10.3
8.9
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
9.1
9
8
10
8
9
February
9.9
9
11
11
9
10
March
10.2
10
10
11
11
10
April
9.8
9
11
9
9
May
8.6
7
9
8
9
June
8.0
7
8
8
8
July
7.1
7
8
8
6
August
7.2
7
7
7
7
September
7.3
6
8
8
8
October
8.7
9
9
8
8
November
9.3
9
10
9
11
December
8.8
7
9
10
9
Average
8.7
9.5
8.0
9.2
8.5
8.5
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
243°
256°
262°
277°
244°
February
251°
245°
250°
273°
269°
March
256°
272°
260°
245°
245°
April
238°
240°
257°
268°
May
001°
178°
244°
267°
June
017°
257°
225°
236°
July
258°
244°
296°
250°
August
267°
244°
228°
267°
September
196°
270°
245°
241°
October
265°
236°
244°
248°
November
250°
232°
238°
240°
December
246°
238°
235°
253°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.