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
82.3
56
81
93
90
82
February
89.9
75
95
96
93
94
March
89.3
82
87
94
92
83
April
95.0
95
98
98
96
96
May
93.2
95
86
95
96
June
98.5
97
97
99
100
July
97.6
95
95
98
97
August
96.9
98
94
100
99
September
95.6
96
98
98
91
October
93.5
96
96
98
92
November
92.5
81
92
98
99
December
89.0
76
72
99
96
Average
91.6
77.0
91.4
93.2
96.4
93.9
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
6.1
3
7
7
8
6
February
9.1
16
11
9
1
9
March
15.0
16
13
15
17
16
April
20.5
22
22
21
20
20
May
25.1
27
25
23
23
June
31.6
31
32
32
33
July
32.7
33
33
32
32
August
31.9
35
33
34
31
September
29.3
31
30
30
27
October
20.6
21
23
23
19
November
13.7
15
13
16
17
December
9.3
10
8
14
10
Average
19.7
14.2
21.2
21.2
20.9
20.1
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
-6.6
-7
-4
-8
-3
-4
February
-5.3
0
-5
-7
-10
-4
March
1.8
1
1
0
4
4
April
6.2
6
6
6
7
6
May
12.9
13
13
13
12
June
19.1
18
20
20
21
July
21.1
21
22
20
21
August
19.5
21
19
21
19
September
16.6
16
15
18
13
October
7.4
8
7
9
6
November
0.8
1
0
2
3
December
-3.0
-1
-3
-1
-4
Average
6.8
-1.8
7.9
7.3
8.5
7.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.5
17
6
7
8
5
February
7.1
6
8
9
11
6
March
6.4
4
8
11
7
4
April
5.3
5
3
3
6
6
May
5.9
5
14
7
6
June
2.6
6
7
1
1
July
3.4
3
5
2
4
August
2.8
4
4
1
2
September
3.7
6
6
1
7
October
5.1
6
3
2
2
November
5.3
15
6
0
3
December
6.5
20
4
0
4
Average
5.3
8.0
7.0
6.6
3.6
3.9
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
7.3
4
7
8
8
8
February
8.2
5
9
9
9
8
March
9.5
7
10
10
11
9
April
10.3
10
11
12
10
9
May
8.1
8
10
8
8
June
8.0
6
8
6
10
July
7.0
7
7
6
7
August
6.3
6
6
8
6
September
7.8
7
8
8
8
October
8.3
9
7
8
9
November
8.4
7
10
8
9
December
7.4
7
8
8
7
Average
8.0
6.7
7.7
8.6
8.1
8.0
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
285°
314°
310°
303°
293°
February
205°
222°
317°
022°
339°
March
354°
335°
340°
179°
212°
April
181°
227°
194°
256°
286°
May
125°
126°
144°
062°
June
108°
167°
178°
184°
July
099°
105°
146°
132°
August
265°
121°
178°
157°
September
156°
141°
206°
194°
October
254°
212°
274°
237°
November
186°
254°
243°
220°
December
246°
211°
234°
282°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.