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
84.0
73
90
95
82
75
February
89.7
94
100
94
88
94
March
86.6
91
93
95
88
82
April
94.6
93
99
95
94
95
May
92.2
96
86
89
88
June
98.0
99
99
93
99
July
98.2
96
98
98
97
August
96.7
100
99
95
97
September
94.2
98
97
97
89
October
84.8
94
99
94
38
November
82.4
89
89
98
37
December
89.6
85
77
97
92
Average
91.3
88.3
94.9
94.3
92.9
82.8
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
6.8
4
8
8
7
7
February
8.4
15
11
9
2
9
March
15.3
18
14
16
17
16
April
20.4
22
22
21
19
20
May
24.4
26
25
22
22
June
30.6
30
31
30
32
July
32.6
33
35
31
32
August
31.9
35
35
33
31
September
29.2
31
31
31
26
October
20.9
22
23
23
19
November
13.8
15
12
15
16
December
9.9
10
8
15
10
Average
20.1
14.5
21.3
21.5
20.5
20.3
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
-4.3
-6
-2
-6
-2
-2
February
-4.8
2
-3
-5
-7
-2
March
3.3
4
2
2
5
5
April
7.3
10
7
9
7
7
May
13.8
14
15
13
12
June
19.0
18
19
19
20
July
21.1
21
22
20
22
August
20.0
21
21
21
19
September
17.0
17
16
18
15
October
8.8
10
9
11
7
November
2.4
3
1
4
4
December
-1.1
1
-1
1
-2
Average
8.5
2.4
9.3
8.8
9.1
9.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.8
6
7
4
6
7
February
5.8
4
1
9
11
6
March
3.9
3
3
5
6
3
April
3.5
1
4
1
5
2
May
5.3
4
8
8
8
June
1.9
1
2
4
1
July
1.8
2
3
3
3
August
1.7
0
0
1
0
September
2.9
4
3
2
3
October
4.2
6
2
3
1
November
4.3
9
4
2
3
December
2.9
5
1
0
6
Average
3.5
3.2
3.4
3.5
4.1
3.4
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
10.1
10
10
10
10
10
March
11.2
11
12
11
12
9
April
11.7
12
11
13
12
10
May
9.4
8
11
9
9
June
9.3
7
9
8
11
July
7.7
8
8
7
8
August
7.9
7
8
9
8
September
9.1
8
9
9
9
October
9.8
10
9
9
10
November
9.7
9
11
10
11
December
8.7
9
9
9
8
Average
9.5
10.7
8.9
9.8
9.4
9.3
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
238°
276°
307°
309°
297°
February
214°
222°
301°
010°
319°
March
223°
329°
233°
176°
188°
April
180°
205°
181°
232°
211°
May
148°
143°
127°
061°
June
132°
157°
164°
177°
July
181°
143°
158°
152°
August
201°
155°
168°
150°
September
165°
162°
174°
173°
October
196°
216°
243°
180°
November
181°
232°
206°
203°
December
242°
218°
202°
291°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.