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
76.1
63
77
82
78
77
February
83.5
93
94
85
86
74
March
87.7
89
83
91
93
82
April
92.3
93
90
96
91
May
93.5
96
89
94
96
June
94.8
88
98
95
97
July
95.5
94
94
95
97
August
96.0
98
92
97
96
September
93.6
90
95
95
97
October
90.0
91
98
85
81
November
89.0
92
90
93
90
December
83.5
82
77
86
86
Average
89.3
82.0
90.2
90.9
91.6
89.5
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
3.6
3
7
2
3
6
February
7.2
11
12
6
0
5
March
11.8
15
12
14
15
13
April
17.2
18
16
18
16
May
23.2
23
25
22
21
June
27.6
27
29
28
29
July
29.3
29
30
29
31
August
28.5
28
29
32
28
September
26.1
26
25
27
26
October
19.2
19
19
21
18
November
10.9
13
13
11
15
December
7.0
9
6
11
6
Average
16.6
9.4
18.6
18.0
17.9
17.8
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
-4.5
-3
0
-7
-2
-1
February
-2.0
0
0
-4
-7
-2
March
1.6
4
1
3
2
4
April
6.3
6
6
7
6
May
12.8
12
14
11
11
June
17.4
16
18
19
18
July
19.8
20
20
20
21
August
18.4
18
19
20
18
September
15.4
15
15
16
14
October
9.2
9
7
13
8
November
1.9
2
3
1
4
December
-1.2
2
0
2
-2
Average
7.1
0.0
8.4
8.0
8.5
8.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
21.0
31
23
18
19
19
February
13.9
6
7
24
16
20
March
12.7
7
17
17
7
12
April
10.3
7
14
12
11
May
8.9
9
11
11
11
June
5.7
7
2
7
3
July
4.4
5
7
5
5
August
3.4
3
4
4
3
September
5.0
3
3
7
2
October
8.2
11
1
11
10
November
9.8
9
11
7
12
December
12.0
13
7
11
14
Average
9.9
14.8
9.0
9.7
9.3
9.5
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
10.0
10
10
10
9
9
February
10.6
10
11
11
10
11
March
11.3
11
12
12
11
11
April
10.6
10
11
10
11
May
9.2
8
10
8
10
June
8.4
8
8
9
8
July
7.2
7
8
7
7
August
7.2
8
8
7
7
September
7.5
6
8
9
8
October
9.2
9
11
9
8
November
9.7
10
10
10
11
December
9.4
9
9
10
10
Average
9.3
10.4
8.8
9.5
8.9
8.9
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
237°
241°
262°
251°
232°
February
256°
233°
236°
308°
264°
March
236°
250°
244°
238°
256°
April
233°
227°
246°
260°
May
023°
185°
270°
225°
June
335°
253°
218°
248°
July
253°
251°
266°
259°
August
273°
252°
231°
274°
September
041°
284°
243°
214°
October
256°
238°
224°
216°
November
232°
227°
234°
234°
December
225°
210°
212°
240°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.