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
91.7
82
94
95
91
99
February
90.6
93
96
96
83
94
March
91.8
93
94
97
89
84
April
96.2
100
98
98
98
May
93.0
90
95
94
94
June
97.8
95
97
96
99
July
95.7
93
95
95
95
August
96.4
100
97
100
95
September
94.6
96
93
99
94
October
94.2
99
97
99
96
November
95.2
97
98
100
97
December
94.3
92
98
97
92
Average
93.8
89.2
95.3
96.3
95.1
94.8
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
8.6
5
8
10
9
11
February
10.2
14
12
10
4
9
March
16.5
17
15
17
16
17
April
21.7
24
23
21
22
May
25.7
25
28
25
27
June
32.3
28
33
33
36
July
33.6
32
36
32
34
August
32.8
34
34
34
33
September
30.3
31
32
32
29
October
21.8
22
23
24
21
November
15.6
17
13
18
18
December
10.9
11
11
15
9
Average
20.6
11.9
21.5
22.8
22.0
22.4
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
-6.2
-7
-5
-7
-5
-5
February
-6.8
-1
-5
-7
-9
-4
March
-1.6
-1
-2
-1
1
2
April
3.8
5
4
3
3
May
10.4
13
9
11
10
June
16.1
15
17
17
17
July
18.5
19
20
18
19
August
17.6
18
18
18
17
September
14.0
15
14
15
11
October
5.2
6
7
6
4
November
-1.4
0
-2
1
1
December
-5.6
-3
-5
-3
-5
Average
4.8
-3.0
6.3
5.9
6.1
5.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.5
3
5
5
1
2
February
4.9
4
5
4
11
7
March
3.0
4
2
5
5
2
April
2.2
0
1
2
1
May
3.3
4
4
4
1
June
1.3
2
4
2
2
July
1.1
1
2
1
2
August
0.5
1
1
0
1
September
2.2
3
1
0
5
October
2.4
0
0
2
1
November
1.7
2
4
0
2
December
2.3
6
0
0
5
Average
2.5
3.4
2.4
2.5
2.2
2.3
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
9.2
9
9
10
10
9
February
9.8
11
11
10
7
10
March
12.0
10
12
14
14
12
April
12.5
12
15
14
11
May
11.2
11
13
13
12
June
11.2
9
12
10
14
July
9.2
8
9
10
10
August
8.8
8
7
11
9
September
10.1
9
9
11
9
October
9.6
9
9
10
9
November
10.0
9
11
9
12
December
10.2
11
12
11
11
Average
10.3
10.2
9.6
10.8
10.8
10.8
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
323°
312°
314°
324°
314°
February
276°
313°
330°
291°
324°
March
318°
259°
330°
285°
178°
April
197°
265°
292°
324°
May
146°
187°
144°
098°
June
121°
167°
147°
187°
July
147°
146°
143°
135°
August
160°
149°
170°
135°
September
170°
154°
168°
056°
October
309°
212°
275°
021°
November
331°
252°
306°
220°
December
313°
261°
233°
304°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.