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
91.3
81
77
99
92
99
February
89.3
96
71
91
85
96
March
92.6
93
93
98
88
88
April
96.2
96
97
98
98
May
94.5
94
93
93
96
June
98.0
96
98
95
100
July
98.0
94
100
97
99
August
97.9
100
98
99
98
September
95.9
93
96
100
96
October
96.1
99
99
98
93
November
95.9
96
97
99
99
December
91.3
71
97
98
93
Average
94.4
90.2
90.6
96.9
95.3
96.1
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
10.8
7
11
13
11
13
February
12.9
15
14
12
7
11
March
18.6
19
17
20
18
19
April
22.9
23
26
22
22
May
27.4
26
32
25
28
June
32.7
29
34
33
36
July
34.6
33
37
33
35
August
33.7
35
34
35
34
September
30.9
32
33
33
29
October
22.8
24
24
26
22
November
16.6
17
14
19
18
December
12.4
12
12
17
11
Average
21.9
13.7
22.7
24.6
23.2
23.1
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
-5.6
-6
-4
-6
-3
-3
February
-4.1
-1
-4
-5
-8
-3
March
1.4
1
1
0
2
4
April
5.4
5
7
4
5
May
12.0
13
13
12
12
June
17.2
16
18
18
18
July
19.6
19
21
19
20
August
18.4
18
19
19
18
September
14.9
15
15
16
12
October
6.6
7
9
8
5
November
0.3
0
-1
2
2
December
-4.8
-2
-3
-1
-3
Average
6.0
-2.0
6.9
7.6
7.3
7.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.7
4
11
1
2
2
February
4.8
5
3
11
9
5
March
4.3
8
4
4
8
3
April
2.7
2
0
1
3
May
2.6
5
2
3
2
June
2.0
2
4
2
0
July
1.1
1
2
2
1
August
1.0
1
2
1
1
September
3.7
7
4
4
5
October
6.6
3
2
5
6
November
2.3
4
2
0
5
December
3.4
9
0
0
8
Average
3.4
5.8
4.0
2.9
2.9
3.1
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
10.0
9
10
11
11
9
February
11.3
12
13
12
9
11
March
12.7
11
13
14
14
13
April
13.3
13
14
14
12
May
11.1
11
14
11
11
June
10.9
8
12
10
14
July
9.0
9
9
9
9
August
9.2
9
8
11
9
September
10.7
9
10
12
10
October
10.6
10
9
10
10
November
10.7
9
12
10
12
December
10.6
11
12
11
11
Average
10.8
10.7
10.3
11.4
10.9
10.9
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
323°
305°
352°
315°
295°
February
278°
273°
352°
026°
332°
March
262°
266°
329°
253°
201°
April
229°
243°
244°
309°
May
170°
214°
164°
095°
June
155°
186°
179°
196°
July
193°
174°
179°
162°
August
184°
185°
193°
164°
September
185°
194°
216°
215°
October
244°
217°
240°
194°
November
298°
264°
305°
223°
December
312°
257°
239°
327°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.