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
90.3
97
77
82
92
99
February
85.0
81
92
88
89
83
March
90.8
92
92
86
89
91
April
93.2
92
100
92
90
May
89.8
84
91
89
96
June
98.1
94
99
100
100
July
97.8
96
98
100
99
August
97.6
99
98
97
100
September
96.4
98
94
100
96
October
92.6
91
94
100
93
November
92.6
97
92
100
96
December
94.7
96
94
98
94
Average
93.0
89.6
92.2
93.2
95.4
94.9
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
6.6
6
1
8
8
9
February
7.1
11
7
6
4
5
March
12.5
13
10
13
11
14
April
17.5
18
19
16
17
May
21.8
22
23
21
24
June
28.9
24
30
30
31
July
32.3
31
34
33
33
August
31.5
31
32
32
34
September
28.2
28
29
29
28
October
18.5
20
19
21
19
November
13.2
14
10
17
15
December
9.0
11
8
12
8
Average
17.8
9.6
18.0
19.5
19.4
19.6
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
-7.8
-8
-8
-7
-5
-5
February
-7.6
-3
-6
-8
-9
-7
March
-2.2
-2
-4
-3
-2
-1
April
1.7
1
2
1
1
May
7.4
9
7
8
8
June
13.2
12
13
15
13
July
16.9
16
18
17
17
August
16.0
16
17
17
17
September
12.2
12
13
13
11
October
3.6
4
6
5
3
November
-2.7
0
-4
1
0
December
-5.2
-3
-7
-4
-5
Average
3.2
-5.8
4.1
4.3
4.9
4.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.3
7
16
15
5
2
February
11.8
15
9
14
10
17
March
7.9
11
5
17
11
4
April
6.5
9
0
8
10
May
6.8
8
6
7
3
June
2.6
9
2
1
2
July
1.1
1
1
1
1
August
1.4
1
3
1
1
September
1.8
1
4
1
5
October
4.7
5
3
1
4
November
5.4
7
9
1
2
December
4.6
3
6
2
5
Average
5.7
10.8
6.1
6.3
3.8
4.4
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
8.1
8
7
8
8
9
February
9.1
8
10
8
9
10
March
9.8
8
10
10
9
9
April
9.9
9
12
9
8
May
8.8
8
11
8
9
June
8.4
8
9
7
10
July
7.8
8
8
7
8
August
7.5
8
8
7
7
September
7.8
8
7
8
7
October
8.2
8
7
9
8
November
8.2
8
8
8
9
December
8.9
9
11
9
9
Average
8.5
8.4
8.4
8.8
8.1
8.6
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
295°
132°
004°
360°
231°
February
285°
258°
157°
309°
218°
March
345°
066°
354°
183°
087°
April
328°
302°
006°
344°
May
024°
266°
110°
089°
June
138°
179°
155°
198°
July
032°
325°
014°
229°
August
140°
318°
300°
288°
September
256°
217°
034°
013°
October
038°
286°
106°
028°
November
109°
125°
268°
205°
December
310°
257°
232°
286°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.