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
75.6
63
86
91
78
62
February
88.9
97
91
95
82
98
March
87.1
95
86
93
86
76
April
93.9
96
100
94
92
91
May
89.9
93
92
87
91
June
97.1
98
99
96
99
July
94.7
96
90
96
94
August
94.2
90
96
100
96
September
91.1
96
93
97
83
October
91.3
97
96
90
91
November
94.0
96
95
98
92
December
85.5
76
76
95
89
Average
89.9
88.3
92.4
93.2
91.6
88.7
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
2.2
-1
5
3
3
3
February
5.5
13
9
6
-2
6
March
12.5
16
11
13
15
14
April
18.5
20
20
17
18
17
May
22.7
26
24
21
21
June
28.8
27
30
30
30
July
29.9
29
30
30
30
August
27.6
28
24
30
28
September
26.9
28
27
28
25
October
18.6
20
21
20
17
November
11.2
13
11
14
15
December
7.8
8
6
12
7
Average
16.7
12.1
18.5
17.9
18.2
18.0
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
-6.0
-8
-4
-9
-4
-5
February
-6.6
0
-4
-7
-11
-3
March
1.6
3
0
0
4
3
April
6.3
8
6
5
6
5
May
12.6
13
14
12
12
June
15.0
3
17
19
19
July
18.9
15
19
20
21
August
16.6
14
12
20
18
September
14.6
11
14
16
13
October
7.4
9
7
10
6
November
0.4
2
0
2
3
December
-2.0
1
-4
0
-4
Average
5.8
0.7
5.5
5.9
8.0
7.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.8
14
6
5
13
17
February
7.4
2
6
8
17
4
March
7.7
2
10
9
8
10
April
4.9
5
2
5
7
8
May
5.6
5
5
6
3
June
2.2
4
2
2
1
July
2.1
2
0
3
3
August
2.0
1
0
0
0
September
2.3
1
3
0
1
October
4.6
6
4
1
2
November
4.3
4
4
2
4
December
6.3
13
5
0
5
Average
5.3
5.4
4.5
3.8
4.8
4.5
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
9.4
8
10
10
9
9
February
10.5
10
11
12
10
10
March
11.4
12
11
12
12
10
April
11.7
12
12
13
11
11
May
9.2
8
10
9
10
June
8.3
7
9
7
9
July
7.0
7
7
7
6
August
7.3
7
7
8
7
September
8.0
7
8
9
8
October
9.4
10
10
9
9
November
10.1
9
11
10
12
December
9.8
10
11
11
8
Average
9.4
10.9
8.9
9.8
9.3
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
281°
288°
293°
291°
268°
February
237°
227°
291°
349°
328°
March
231°
294°
312°
167°
177°
April
224°
232°
232°
252°
277°
May
134°
144°
161°
050°
June
130°
198°
182°
181°
July
241°
172°
175°
141°
August
167°
168°
172°
169°
September
166°
154°
202°
171°
October
267°
246°
315°
258°
November
205°
247°
234°
219°
December
253°
212°
216°
283°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.