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
75.8
64
61
92
72
82
February
85.4
91
85
92
86
94
March
87.0
87
84
84
94
81
April
88.0
88
89
86
96
85
May
90.3
94
91
97
87
June
91.5
76
94
97
99
July
94.9
87
95
93
98
August
95.7
94
91
97
99
September
92.7
91
93
97
93
October
89.6
90
89
86
92
November
91.3
92
90
97
94
December
84.1
77
73
89
95
Average
88.7
83.0
85.3
89.8
92.3
91.7
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
0.2
0
3
-2
1
3
February
3.1
9
5
2
-3
2
March
7.9
11
7
9
11
9
April
13.9
16
16
12
16
13
May
20.4
21
21
21
19
June
26.5
27
27
29
29
July
28.5
29
29
28
30
August
27.5
28
28
30
28
September
24.1
24
24
26
23
October
16.6
17
17
19
15
November
8.7
11
11
9
14
December
4.5
7
4
6
4
Average
14.4
8.8
16.2
15.4
16.1
15.6
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
-7.7
-5
-3
-11
-5
-4
February
-6.2
-1
-4
-8
-11
-5
March
-1.3
2
-1
-1
1
1
April
3.7
6
5
4
5
3
May
9.6
9
11
10
9
June
15.2
15
15
18
16
July
18.1
18
18
18
20
August
17.1
18
18
19
17
September
14.2
16
14
14
13
October
7.3
9
5
11
5
November
0.4
1
2
0
4
December
-3.3
1
-2
-2
-3
Average
5.1
0.3
7.0
5.7
6.5
6.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
13.6
21
23
10
11
11
February
9.2
1
12
10
11
8
March
9.3
13
14
16
3
9
April
11.2
15
12
14
6
11
May
7.8
8
10
5
8
June
5.0
7
6
3
2
July
2.8
4
3
2
3
August
3.2
4
4
2
2
September
5.5
10
5
2
8
October
8.7
11
9
8
9
November
8.3
8
13
7
5
December
9.7
16
16
7
5
Average
8.0
12.5
10.3
9.2
5.1
6.4
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
9.3
9
9
10
9
9
February
10.1
9
11
11
9
10
March
10.3
11
10
10
11
10
April
10.6
11
11
12
10
10
May
9.1
9
10
9
9
June
8.2
8
8
8
8
July
7.3
7
8
8
7
August
7.2
8
8
7
7
September
7.9
7
8
8
9
October
9.0
9
9
8
9
November
9.8
10
11
10
11
December
9.4
8
10
10
9
Average
9.1
10.3
8.7
9.4
8.8
8.9
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
276°
266°
274°
295°
265°
February
262°
260°
267°
279°
291°
March
284°
311°
285°
220°
233°
April
286°
241°
216°
243°
309°
May
069°
137°
152°
074°
June
047°
251°
213°
143°
July
264°
273°
325°
212°
August
010°
252°
179°
219°
September
139°
300°
238°
245°
October
261°
253°
011°
263°
November
254°
240°
252°
240°
December
271°
205°
243°
270°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.