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
83.4
85
82
76
93
91
February
84.1
79
86
76
90
84
March
80.4
76
77
77
89
84
April
85.6
86
80
96
92
May
93.6
94
85
94
97
June
87.4
80
82
87
95
July
83.6
60
86
91
83
August
90.1
76
91
92
94
September
88.2
81
79
89
97
October
88.4
83
84
89
89
November
86.7
80
84
93
87
December
87.6
89
87
89
85
Average
86.4
79.7
80.1
82.1
90.9
90.2
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
-7.9
-5
-4
-9
-4
-6
February
-6.6
-3
-6
-7
-4
-4
March
-1.6
2
1
-1
1
-1
April
4.7
6
6
7
4
May
12.7
14
14
13
14
June
17.9
18
17
20
18
July
21.6
22
21
21
22
August
20.8
19
22
23
21
September
15.9
19
16
16
15
October
9.9
12
11
12
7
November
2.0
2
3
4
3
December
-3.1
0
0
-3
-1
Average
6.4
-2.0
8.5
8.0
8.8
7.8
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
-15.1
-13
-13
-21
-10
-14
February
-15.1
-12
-18
-16
-13
-14
March
-9.6
-5
-6
-10
-8
-11
April
-2.0
-1
-1
0
-3
May
3.2
4
3
4
4
June
8.7
10
9
10
8
July
12.2
14
11
11
14
August
11.8
12
12
13
12
September
7.6
10
8
9
6
October
3.1
6
4
5
1
November
-5.7
-5
-3
-2
-4
December
-11.7
-7
-6
-12
-8
Average
-2.2
-10.1
0.7
-1.5
0.6
-1.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
33.4
31
42
43
17
27
February
27.9
30
29
41
20
20
March
27.7
40
33
41
16
19
April
16.6
15
25
16
12
May
12.4
13
21
14
11
June
12.3
21
23
11
5
July
9.5
13
16
11
10
August
10.5
24
12
4
10
September
10.1
9
9
17
10
October
16.2
23
19
17
22
November
22.7
29
41
10
16
December
23.7
22
36
27
23
Average
18.7
34.5
21.7
25.8
14.1
14.0
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
8.8
11
8
9
7
8
February
9.5
8
10
10
9
11
March
10.3
10
9
11
11
10
April
10.2
11
10
10
11
May
9.6
11
9
9
10
June
9.4
9
9
9
10
July
8.4
7
8
8
8
August
8.4
8
8
9
9
September
8.4
8
8
9
9
October
9.2
9
12
7
9
November
9.8
10
11
9
9
December
9.2
8
12
10
9
Average
9.3
9.4
8.8
9.5
8.9
9.4
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
280°
341°
269°
335°
310°
February
325°
281°
281°
287°
261°
March
040°
072°
326°
267°
338°
April
101°
059°
061°
282°
May
298°
085°
180°
270°
June
092°
113°
236°
209°
July
124°
240°
233°
145°
August
109°
231°
231°
252°
September
189°
281°
234°
240°
October
064°
218°
092°
272°
November
253°
288°
261°
262°
December
303°
067°
276°
286°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.