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
96.4
95
94
98
93
99
February
95.1
91
92
94
100
98
March
97.6
98
93
99
97
97
April
99.7
100
100
100
100
May
99.6
99
100
100
100
June
99.9
100
100
100
100
July
99.5
100
99
98
100
August
99.4
99
98
100
100
September
99.2
100
97
99
100
October
99.3
100
99
100
100
November
98.3
98
97
100
100
December
96.6
95
95
98
99
Average
98.1
94.9
97.5
98.1
98.7
99.4
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
11.3
11
9
12
11
13
February
12.3
12
11
13
13
14
March
15.3
14
12
17
14
14
April
21.4
21
22
21
20
May
24.7
24
26
25
27
June
30.9
28
31
33
30
July
32.2
35
32
31
33
August
31.1
32
29
30
34
September
28.3
28
28
28
30
October
22.5
24
21
20
26
November
17.1
17
13
19
18
December
12.0
14
10
11
12
Average
20.5
12.2
21.1
21.4
21.3
22.3
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
-3.6
-2
-3
-3
-4
-3
February
-2.4
0
-3
-4
-2
-2
March
1.4
2
1
1
0
2
April
5.5
4
5
6
5
May
8.9
8
10
9
11
June
14.4
12
15
17
14
July
18.3
19
19
18
18
August
17.0
17
17
17
18
September
13.4
13
14
14
13
October
6.2
7
6
5
7
November
1.2
2
-2
2
2
December
-3.8
-1
-3
-1
-5
Average
5.9
-1.8
6.3
6.5
6.8
6.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.1
8
13
2
10
1
February
7.4
12
10
7
1
2
March
4.9
4
13
4
6
7
April
0.5
0
0
0
2
May
1.1
0
0
0
0
June
0.4
0
1
0
0
July
1.6
1
4
2
1
August
1.2
2
3
0
1
September
2.5
4
5
4
0
October
1.7
1
2
1
0
November
2.1
0
3
2
2
December
3.4
3
6
6
2
Average
3.2
7.6
3.7
2.9
2.6
1.3
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
5.9
6
8
5
5
5
February
7.3
7
9
7
8
7
March
8.2
8
9
8
8
8
April
8.7
8
9
9
9
May
8.6
9
10
8
9
June
7.9
9
8
7
8
July
6.1
7
6
5
7
August
5.7
6
5
6
7
September
6.2
7
5
5
6
October
6.3
6
5
7
6
November
5.7
6
7
5
7
December
5.3
5
6
6
5
Average
6.9
7.1
7.3
6.7
6.6
7.0
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
247°
216°
331°
293°
303°
February
205°
192°
259°
287°
294°
March
202°
209°
266°
201°
177°
April
229°
228°
216°
199°
May
187°
214°
210°
203°
June
189°
210°
221°
200°
July
217°
213°
226°
208°
August
205°
241°
204°
212°
September
191°
180°
200°
243°
October
197°
288°
196°
259°
November
207°
214°
247°
192°
December
098°
195°
195°
305°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.