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
82.3
69
82
97
84
74
February
90.9
95
89
98
87
99
March
89.3
94
88
93
90
84
April
95.3
98
96
96
95
May
93.9
93
96
95
91
June
98.0
99
97
96
100
July
97.3
94
96
97
100
August
96.6
93
98
100
98
September
96.0
96
99
100
94
October
92.5
96
100
94
94
November
95.3
99
97
98
92
December
88.2
83
71
95
93
Average
92.4
85.7
92.8
95.5
94.5
92.9
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
0.9
-2
2
3
2
1
February
4.4
12
6
6
-4
6
March
11.6
14
9
12
15
13
April
18.0
20
18
19
18
May
23.9
26
24
22
21
June
30.7
31
30
32
31
July
31.2
30
32
31
32
August
30.1
30
31
31
31
September
27.5
28
28
29
26
October
18.0
19
20
20
16
November
10.7
13
10
13
14
December
5.0
7
3
9
5
Average
16.5
7.7
18.4
18.6
18.4
17.7
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
-8.3
-10
-6
-10
-5
-7
February
-8.8
-2
-6
-9
-12
-6
March
0.1
0
-3
-1
2
3
April
5.0
5
5
6
4
May
12.6
13
13
12
11
June
19.1
18
19
19
20
July
20.5
19
21
20
21
August
19.3
20
19
21
19
September
15.6
15
14
16
13
October
6.6
8
5
9
5
November
-1.5
0
-2
2
1
December
-5.4
-2
-6
-3
-6
Average
5.3
-4.0
6.7
6.1
7.3
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
11.6
16
9
4
14
16
February
9.1
1
10
6
16
3
March
9.5
7
11
8
10
9
April
7.0
4
7
5
6
May
7.2
3
9
7
14
June
3.2
2
4
2
2
July
3.6
8
4
1
3
August
3.3
4
4
1
1
September
4.4
3
2
2
7
October
8.1
6
3
6
7
November
6.0
5
7
3
6
December
11.6
15
25
5
7
Average
7.0
8.1
6.4
6.1
5.6
6.5
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
9.9
9
9
10
10
11
February
10.4
10
11
12
9
11
March
11.6
12
11
13
12
10
April
12.0
13
14
11
11
May
9.7
9
11
10
10
June
9.3
8
9
8
11
July
8.0
7
9
8
9
August
8.3
8
8
9
10
September
9.6
9
10
9
9
October
9.9
10
10
9
10
November
10.5
9
13
10
11
December
9.5
9
11
10
9
Average
9.9
10.4
9.3
10.6
9.5
10.1
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°
326°
293°
331°
309°
February
275°
282°
325°
351°
341°
March
360°
340°
341°
147°
224°
April
263°
239°
291°
307°
May
140°
164°
147°
001°
June
141°
180°
169°
164°
July
074°
187°
157°
149°
August
161°
152°
154°
170°
September
166°
150°
171°
193°
October
308°
238°
190°
308°
November
199°
280°
244°
223°
December
307°
223°
239°
312°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.