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
90.7
93
77
86
92
99
February
87.0
85
87
83
87
92
March
90.7
90
87
89
90
88
April
93.9
93
100
91
92
May
92.6
90
94
88
98
June
98.7
94
100
100
100
July
94.8
92
89
99
99
August
94.1
97
96
99
88
September
92.2
96
93
100
86
October
93.3
86
98
100
89
November
92.6
95
86
97
97
December
96.0
95
100
97
95
Average
92.7
89.3
90.7
92.6
95.0
93.3
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
6.0
5
2
5
6
8
February
6.9
10
7
6
3
6
March
12.8
14
10
14
11
13
April
17.6
18
19
16
17
May
21.8
23
23
20
24
June
29.3
25
31
31
31
July
32.3
31
34
33
33
August
31.4
31
32
32
34
September
28.1
29
29
29
27
October
18.2
20
20
20
17
November
12.4
14
9
16
14
December
7.8
10
7
11
8
Average
17.7
9.5
18.2
19.4
19.3
19.2
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
-8.8
-9
-8
-9
-6
-5
February
-8.7
-4
-8
-10
-10
-7
March
-3.7
-1
-4
-3
-3
-1
April
1.3
1
1
1
0
May
7.2
9
7
7
8
June
12.7
13
13
13
13
July
15.9
16
18
16
15
August
14.9
15
16
15
15
September
10.9
11
12
12
9
October
2.4
4
5
4
1
November
-3.4
-2
-6
0
-2
December
-6.1
-4
-7
-5
-6
Average
2.4
-5.2
3.4
3.3
3.7
3.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.9
7
20
11
6
0
February
14.1
11
14
21
16
16
March
9.3
10
9
18
10
6
April
7.2
9
0
8
10
May
9.4
9
10
12
4
June
3.2
12
1
1
3
July
2.5
3
3
2
3
August
2.3
4
1
1
2
September
3.1
3
3
1
3
October
6.2
9
2
1
4
November
6.3
8
14
1
2
December
5.1
0
0
4
5
Average
6.7
9.4
8.1
7.1
5.0
4.7
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
5.9
5
5
5
6
7
February
7.0
7
8
6
6
7
March
7.7
6
8
8
7
8
April
8.3
8
12
8
7
May
6.5
6
7
6
6
June
6.2
6
6
6
6
July
6.1
5
7
6
7
August
6.1
6
6
6
6
September
5.8
5
5
6
5
October
6.4
6
5
7
6
November
5.9
6
6
7
5
December
6.8
7
9
8
6
Average
6.5
6.1
6.3
6.8
6.5
6.4
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
052°
075°
050°
029°
358°
February
128°
360°
098°
107°
359°
March
124°
028°
012°
351°
090°
April
005°
307°
018°
360°
May
043°
129°
079°
084°
June
133°
171°
055°
175°
July
058°
107°
076°
098°
August
086°
094°
123°
095°
September
118°
128°
097°
086°
October
141°
102°
071°
112°
November
140°
076°
212°
131°
December
342°
331°
253°
004°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.