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
77.6
61
74
90
85
83
February
86.1
90
87
88
89
87
March
89.4
89
88
85
99
90
April
94.7
97
94
99
97
May
95.2
98
95
98
96
June
95.6
88
99
96
100
July
96.8
97
98
95
97
August
95.9
96
96
97
97
September
95.2
94
98
95
98
October
91.7
94
96
85
94
November
90.9
92
92
94
89
December
85.1
69
93
92
95
Average
90.4
81.3
90.4
93.8
94.0
94.2
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
-1.7
-1
2
-3
0
1
February
1.8
7
4
1
-2
1
March
6.6
9
6
7
11
8
April
12.9
15
12
16
11
May
20.5
21
22
21
18
June
25.9
26
27
27
27
July
27.8
27
28
27
29
August
25.9
25
27
28
27
September
22.3
23
23
23
22
October
15.5
17
17
18
13
November
7.5
8
11
9
12
December
2.9
6
3
5
2
Average
12.9
4.9
15.0
15.0
15.1
14.4
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
-6.2
-5
-2
-11
-5
-3
February
-6.3
-3
-4
-7
-10
-6
March
-2.2
0
-2
-2
-1
-1
April
3.2
4
2
4
2
May
9.3
7
11
8
8
June
14.5
14
15
17
14
July
16.7
16
16
17
18
August
16.1
15
16
17
16
September
12.5
13
13
12
11
October
6.8
8
5
11
5
November
0.0
0
1
1
2
December
-3.6
1
-2
-1
-3
Average
4.3
-3.3
5.8
5.1
5.8
5.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
17.0
41
18
14
14
11
February
12.6
5
11
13
12
14
March
10.2
13
14
11
1
5
April
9.2
8
13
6
4
May
5.9
4
5
7
9
June
5.6
5
5
9
1
July
3.4
4
3
2
3
August
4.7
8
4
2
4
September
6.1
5
6
9
6
October
9.6
14
7
11
8
November
9.4
11
9
11
5
December
10.4
19
5
5
10
Average
9.4
18.0
9.5
7.7
7.0
6.2
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
8.2
8
7
9
7
8
February
9.6
10
10
10
9
10
March
9.9
11
9
9
11
10
April
9.4
9
9
9
10
May
8.1
7
9
8
8
June
7.3
6
8
7
7
July
6.4
5
7
7
6
August
5.7
6
6
5
6
September
6.6
5
6
7
7
October
7.7
7
8
7
8
November
8.8
9
9
9
10
December
8.4
8
8
9
9
Average
8.2
9.7
7.4
8.1
7.7
8.0
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°
244°
254°
286°
233°
February
241°
234°
250°
255°
260°
March
248°
294°
266°
254°
261°
April
235°
240°
259°
273°
May
352°
189°
273°
344°
June
013°
251°
234°
247°
July
246°
262°
302°
274°
August
285°
258°
226°
269°
September
148°
271°
262°
234°
October
244°
233°
224°
243°
November
240°
222°
236°
238°
December
248°
215°
238°
257°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.