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
76.9
69
76
92
76
67
February
85.3
93
95
85
89
83
March
88.2
92
70
95
91
80
April
93.5
97
95
95
92
May
91.6
98
88
91
87
June
96.2
95
98
96
97
July
94.8
97
93
89
94
August
94.5
91
94
95
96
September
94.2
94
93
95
90
October
88.8
91
91
81
90
November
91.6
97
93
99
92
December
85.4
81
85
79
97
Average
90.3
88.6
91.5
92.1
90.0
89.0
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
2.7
1
6
1
2
4
February
6.4
12
9
4
-1
5
March
12.0
15
12
13
14
12
April
17.3
18
17
18
17
May
23.4
25
24
21
21
June
28.6
28
30
29
29
July
28.5
29
30
28
24
August
28.0
29
28
29
28
September
26.8
27
25
28
25
October
19.2
19
19
21
18
November
10.9
13
12
11
14
December
6.9
8
6
11
6
Average
16.8
11.5
19.1
17.5
17.6
16.8
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
-5
-1
-8
-3
-3
February
-3.0
-1
-1
-6
-8
-3
March
2.1
3
2
2
4
4
April
6.5
8
6
6
5
May
13.2
13
14
12
12
June
17.5
16
18
19
18
July
18.4
19
20
19
14
August
17.8
18
18
19
17
September
14.7
14
14
15
13
October
7.9
8
5
11
6
November
0.8
1
2
0
4
December
-2.8
2
-1
1
-2
Average
6.8
1.2
8.6
7.2
8.0
7.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.4
10
7
5
15
5
February
7.3
1
3
14
12
11
March
8.4
4
23
9
8
10
April
7.2
4
9
8
8
May
5.3
3
5
6
6
June
2.2
2
3
2
1
July
3.3
1
6
4
5
August
2.5
4
1
2
2
September
1.7
1
4
3
1
October
4.9
6
3
4
6
November
3.9
3
3
1
4
December
5.7
12
1
4
3
Average
5.0
4.7
4.1
5.3
5.5
5.0
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
8
10
8
8
8
February
9.2
10
10
5
10
10
March
10.4
11
12
11
11
10
April
10.7
11
12
10
11
May
8.6
5
10
9
9
June
7.1
7
7
7
7
July
5.3
5
6
4
5
August
5.2
6
5
5
5
September
5.9
6
6
6
6
October
8.3
9
9
4
10
November
9.4
8
11
9
11
December
9.3
10
9
10
9
Average
8.3
10.2
7.3
8.1
7.6
8.2
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
255°
249°
300°
263°
232°
February
193°
227°
227°
333°
303°
March
207°
019°
219°
148°
207°
April
213°
207°
228°
258°
May
062°
174°
164°
226°
June
031°
218°
189°
190°
July
231°
210°
267°
151°
August
216°
186°
164°
072°
September
152°
307°
208°
188°
October
238°
220°
329°
253°
November
216°
212°
225°
200°
December
202°
197°
198°
235°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.