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
92.0
95
88
81
95
99
February
88.7
88
89
91
91
85
March
91.0
91
93
92
87
82
April
94.2
93
99
96
94
May
92.1
94
91
85
98
June
98.0
98
92
99
100
July
97.7
95
99
99
99
August
98.4
100
100
100
99
September
95.2
98
91
100
93
October
94.1
98
94
97
93
November
92.7
91
91
97
100
December
95.1
89
98
99
93
Average
93.9
91.1
94.1
93.0
95.2
94.7
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
6.3
5
4
8
5
7
February
6.8
10
8
5
4
4
March
11.3
12
10
11
10
12
April
15.7
16
17
15
15
May
19.7
20
21
18
22
June
26.3
23
26
27
28
July
28.6
29
29
28
29
August
28.0
29
28
29
30
September
25.3
25
26
26
24
October
16.8
18
18
18
17
November
12.0
13
9
15
14
December
7.7
8
7
11
5
Average
16.0
8.5
16.8
17.5
17.2
17.5
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
-8.1
-9
-8
-9
-7
-7
February
-8.4
-4
-8
-11
-10
-9
March
-4.4
-2
-6
-5
-4
-2
April
-1.7
-1
0
-1
-1
May
4.4
6
4
5
5
June
9.9
9
10
12
10
July
12.9
12
14
13
13
August
11.9
12
12
12
12
September
8.6
9
8
8
7
October
0.4
1
2
2
-1
November
-5.8
-4
-7
-3
-4
December
-8.7
-6
-9
-5
-7
Average
0.6
-6.8
1.2
1.1
1.9
1.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
11.3
14
16
24
5
2
February
11.6
13
12
12
7
25
March
11.0
13
13
21
17
9
April
7.8
14
5
8
9
May
7.1
8
10
12
2
June
3.1
8
5
1
2
July
3.5
4
8
3
3
August
3.0
3
5
1
2
September
3.7
5
7
1
4
October
6.1
5
4
3
7
November
6.4
12
9
1
2
December
5.6
12
4
2
10
Average
7.1
13.3
8.8
9.3
5.1
5.9
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
8.6
8
9
9
9
8
February
9.7
9
11
8
9
9
March
10.3
10
11
11
11
9
April
10.7
10
15
11
9
May
10.1
9
13
10
10
June
8.6
8
9
9
9
July
7.9
8
8
8
8
August
7.9
8
8
9
8
September
8.4
8
9
9
8
October
8.8
9
9
10
9
November
8.2
8
9
8
9
December
8.9
9
9
11
9
Average
9.0
9.2
9.0
9.9
9.4
8.7
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
335°
319°
331°
345°
226°
February
273°
274°
148°
217°
013°
March
265°
218°
349°
286°
216°
April
288°
242°
011°
338°
May
283°
189°
154°
147°
June
140°
162°
135°
177°
July
059°
035°
072°
046°
August
123°
121°
142°
099°
September
146°
136°
119°
013°
October
155°
257°
174°
201°
November
283°
235°
264°
192°
December
342°
215°
231°
359°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.