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
88.0
76
90
92
87
86
February
86.7
86
90
90
87
92
March
88.2
57
86
95
93
91
April
93.1
98
82
98
96
91
May
93.4
92
90
94
94
June
99.0
98
98
98
99
July
98.5
100
100
99
99
August
96.8
99
94
99
98
September
95.7
95
97
99
90
October
92.2
96
98
95
82
November
93.1
95
92
99
93
December
88.1
88
63
95
93
Average
91.7
78.8
92.4
93.3
95.3
92.5
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
8.7
5
11
10
8
10
February
11.1
17
13
10
4
10
March
17.1
20
15
17
18
18
April
21.4
23
22
22
21
21
May
25.2
26
25
23
23
June
31.2
31
32
32
32
July
33.7
34
38
32
33
August
32.3
35
35
33
32
September
30.0
31
32
32
27
October
22.2
23
24
24
20
November
15.6
17
14
17
18
December
11.7
13
9
17
11
Average
21.0
16.0
22.6
22.7
21.7
21.3
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
-3.4
-5
-1
-5
-1
-1
February
-1.0
3
0
-3
-7
-1
March
4.9
7
4
3
6
7
April
8.6
10
8
9
8
8
May
14.5
14
16
13
14
June
19.8
20
20
20
20
July
21.9
21
23
21
23
August
20.4
21
19
22
20
September
17.3
17
16
18
16
October
9.7
10
9
12
8
November
3.0
4
2
4
5
December
0.5
3
2
3
-1
Average
9.0
3.6
10.0
9.4
10.1
9.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.2
11
6
6
7
7
February
6.7
3
6
12
10
8
March
4.0
3
5
6
7
3
April
4.8
6
3
1
5
7
May
7.6
12
13
9
10
June
2.0
1
2
4
3
July
3.2
4
6
1
5
August
2.8
1
1
1
2
September
3.4
4
0
2
6
October
7.5
6
3
7
7
November
3.1
2
4
2
3
December
4.0
8
2
2
5
Average
4.7
5.3
4.8
4.7
4.3
5.4
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
8.9
8
8
9
9
9
February
10.0
10
9
11
10
9
March
10.7
11
11
11
11
9
April
11.1
12
11
13
11
10
May
8.3
7
10
8
8
June
8.4
6
8
8
10
July
7.1
7
8
6
7
August
6.9
7
7
8
7
September
7.6
8
8
8
7
October
9.2
10
9
9
9
November
9.0
8
10
10
10
December
8.6
9
8
9
8
Average
9.0
10.2
8.4
9.4
8.8
8.5
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
307°
264°
319°
306°
207°
February
195°
208°
330°
009°
343°
March
190°
346°
213°
173°
175°
April
184°
203°
177°
196°
199°
May
171°
164°
123°
095°
June
176°
169°
174°
185°
July
194°
172°
177°
181°
August
203°
162°
172°
163°
September
163°
147°
176°
159°
October
232°
246°
222°
161°
November
183°
221°
194°
198°
December
226°
209°
193°
270°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.