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
80.6
63
84
95
87
71
February
91.5
91
95
100
84
96
March
87.2
94
88
97
86
75
April
94.8
95
100
96
94
94
May
91.0
94
90
94
88
June
98.2
98
100
97
99
July
94.7
96
86
94
94
August
94.7
93
96
98
98
September
93.3
94
97
97
93
October
90.7
95
99
89
91
November
93.9
98
97
97
93
December
90.2
87
81
94
91
Average
91.4
86.4
93.7
94.9
92.7
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
3.2
-1
3
6
5
3
February
6.3
14
8
8
-1
7
March
12.9
15
10
14
16
14
April
19.1
22
20
19
19
19
May
24.2
27
25
23
22
June
31.3
31
31
32
32
July
31.4
32
31
32
30
August
30.4
33
32
32
29
September
28.3
30
29
29
26
October
19.2
21
21
21
18
November
12.4
15
11
15
15
December
7.0
8
5
11
8
Average
18.0
12.1
19.8
19.8
19.4
18.5
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
-7.3
-9
-6
-8
-4
-5
February
-7.6
-1
-6
-8
-11
-5
March
0.1
1
-2
-2
3
2
April
4.5
6
4
5
5
3
May
11.7
13
13
12
10
June
18.0
17
18
18
19
July
19.0
19
15
19
20
August
18.1
20
17
19
18
September
14.7
15
13
15
12
October
5.9
8
5
7
5
November
-1.6
0
-3
2
2
December
-5.7
-2
-6
-3
-5
Average
5.4
-1.2
6.7
5.1
6.7
6.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.0
11
6
5
8
7
February
5.2
4
1
3
11
0
March
5.0
4
4
3
10
4
April
4.7
3
2
4
7
5
May
5.3
3
12
5
7
June
1.6
3
0
0
1
July
2.3
2
3
2
3
August
2.8
3
3
2
0
September
3.4
4
5
2
5
October
5.1
3
2
4
1
November
4.0
8
3
2
4
December
5.0
8
5
0
6
Average
4.2
5.0
3.6
3.9
4.3
3.4
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
7.4
6
7
8
8
8
February
8.5
8
9
10
6
9
March
10.2
10
10
11
11
9
April
11.0
12
12
13
10
10
May
8.4
8
10
9
9
June
7.9
6
8
7
10
July
6.1
6
6
6
6
August
6.0
7
6
7
6
September
7.3
7
7
6
7
October
8.3
9
8
8
8
November
8.6
8
11
8
9
December
7.6
6
10
8
7
Average
8.2
9.0
7.9
8.8
7.8
8.2
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
326°
348°
295°
326°
317°
February
294°
288°
330°
015°
323°
March
017°
355°
356°
157°
194°
April
289°
265°
254°
280°
325°
May
147°
168°
146°
049°
June
160°
180°
164°
174°
July
097°
150°
162°
146°
August
289°
143°
160°
169°
September
181°
167°
190°
292°
October
297°
257°
326°
350°
November
212°
276°
265°
217°
December
311°
265°
271°
318°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.