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
92.6
89
92
100
92
90
May
91.1
100
84
91
89
96
June
98.0
97
94
99
100
100
July
98.1
100
96
98
100
99
August
96.9
93
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
93.5
93.7
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
17.6
18
18
19
16
17
May
21.7
21
22
23
21
24
June
29.3
32
24
30
30
31
July
32.4
33
31
34
33
33
August
31.6
32
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
19.2
20.7
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
1.9
4
1
2
1
1
May
7.4
7
9
7
8
8
June
13.4
15
12
13
15
13
July
16.8
16
16
18
17
17
August
16.1
17
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
4.5
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
7.1
11
9
0
8
10
May
6.3
3
8
6
7
3
June
2.4
1
9
2
1
2
July
1.0
1
1
1
1
1
August
1.4
1
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
5.1
5.7
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
9.8
9
9
12
9
8
May
9.0
10
8
11
8
9
June
8.5
10
8
9
7
10
July
7.8
8
8
8
7
8
August
7.6
8
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
8.6
8.7
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
308°
328°
302°
006°
344°
May
219°
024°
266°
110°
089°
June
229°
138°
179°
155°
198°
July
309°
032°
325°
014°
229°
August
239°
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.