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
85.7
72
91
97
89
79
February
90.2
91
99
96
87
90
March
89.7
89
94
96
88
81
April
94.5
100
95
96
93
97
May
91.8
97
95
89
85
85
June
97.7
96
98
98
96
99
July
97.3
98
95
98
98
96
August
96.1
97
100
97
97
96
September
92.8
94
95
97
89
October
92.4
97
100
96
93
November
89.8
88
94
92
91
December
91.5
87
84
99
92
Average
92.7
93.0
94.4
95.1
93.1
90.8
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
7.4
4
8
9
9
8
February
9.8
16
12
10
3
10
March
15.6
18
14
16
17
16
April
20.9
24
22
23
20
21
May
25.2
27
26
27
23
24
June
31.7
32
30
32
32
34
July
33.3
33
33
36
33
33
August
32.7
34
34
35
34
32
September
29.9
31
32
31
28
October
21.4
23
24
23
20
November
14.3
16
13
16
17
December
10.2
11
9
15
9
Average
21.3
23.5
21.6
22.7
21.5
20.7
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
-5.5
-6
-3
-7
-3
-3
February
-4.0
0
-4
-6
-8
-3
March
1.8
2
0
1
4
4
April
5.9
8
6
7
6
5
May
11.6
13
14
14
13
8
June
17.5
20
17
19
19
17
July
19.9
21
21
22
20
17
August
19.1
21
20
20
21
19
September
16.1
17
16
17
14
October
7.4
9
7
10
6
November
1.2
2
0
3
3
December
-3.6
0
-2
-1
-2
Average
7.7
9.8
8.3
7.9
8.3
7.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.3
3
5
5
2
3
February
3.9
2
1
7
11
4
March
2.7
0
1
5
7
2
April
2.7
0
3
1
3
1
May
3.2
2
4
4
6
5
June
1.9
4
1
3
2
1
July
1.3
2
1
2
2
3
August
1.6
2
1
1
1
1
September
2.1
6
1
1
5
October
3.2
1
2
2
3
November
3.2
6
2
3
3
December
2.6
6
1
0
6
Average
2.6
1.6
2.9
2.7
3.2
2.8
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
10.2
9
9
11
11
10
February
11.2
11
12
12
10
11
March
12.7
12
13
13
14
11
April
13.3
14
13
15
13
12
May
10.2
10
9
12
11
10
June
10.4
11
7
11
9
14
July
8.7
9
8
9
8
9
August
8.7
9
8
8
11
9
September
10.4
9
10
10
10
October
11.2
12
10
10
11
November
10.9
10
13
10
12
December
10.4
10
11
10
9
Average
10.7
10.9
10.0
11.2
10.6
10.5
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
308°
317°
325°
326°
322°
February
272°
291°
341°
015°
345°
March
331°
340°
330°
212°
189°
April
255°
234°
222°
287°
350°
May
156°
151°
149°
138°
072°
June
172°
152°
177°
180°
187°
July
178°
188°
165°
161°
150°
August
142°
205°
167°
180°
158°
September
166°
171°
184°
162°
October
210°
220°
292°
147°
November
196°
292°
261°
206°
December
301°
243°
236°
321°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.