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
92.4
93
94
79
92
92
February
90.4
96
92
91
91
89
March
95.4
97
99
93
94
96
April
94.5
98
100
96
94
May
94.4
96
96
89
98
June
93.8
90
94
96
94
July
92.6
94
92
86
93
August
90.1
94
93
94
91
September
88.3
90
92
92
72
October
88.9
91
85
93
80
November
92.2
99
92
81
97
December
90.5
92
94
85
85
Average
92.4
95.3
94.0
91.9
90.9
90.3
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
8.6
8
9
8
10
9
February
7.8
10
8
8
8
9
March
11.6
12
11
11
13
11
April
14.5
13
13
18
17
May
19.2
20
16
19
21
June
21.7
21
20
26
22
July
24.8
25
24
27
25
August
25.4
25
26
26
26
September
21.6
21
22
22
24
October
15.4
16
17
15
16
November
10.8
11
8
12
11
December
7.7
10
4
5
10
Average
15.0
9.6
15.7
15.1
16.6
16.6
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
2.9
3
4
3
4
4
February
1.9
4
2
2
1
3
March
3.5
4
3
5
3
3
April
5.6
5
5
5
5
May
8.5
10
8
7
9
June
10.7
10
11
12
11
July
11.8
12
13
11
12
August
12.2
13
12
13
12
September
10.7
11
9
10
12
October
7.0
8
8
8
8
November
4.2
4
1
6
5
December
2.3
5
-1
0
4
Average
6.4
3.6
7.2
6.6
6.5
7.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
0.0
0
0
0
0
0
February
0.0
0
0
0
0
0
March
0.0
0
0
0
0
0
April
0.0
0
0
0
0
May
0.0
0
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.0
0
0
0
0
November
0.0
0
0
0
0
December
0.0
0
0
0
0
Average
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
5.2
3
5
3
5
7
February
4.6
3
5
2
5
5
March
5.2
5
6
3
6
5
April
5.8
7
4
5
5
May
4.6
5
3
5
6
June
4.6
4
3
5
5
July
4.1
5
2
4
5
August
3.9
5
2
2
5
September
4.0
4
3
2
5
October
4.4
4
5
3
5
November
4.5
3
4
4
6
December
3.9
3
5
3
5
Average
4.5
3.8
4.6
3.3
4.0
5.1
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
102°
094°
137°
113°
133°
February
118°
142°
084°
164°
150°
March
134°
130°
182°
155°
178°
April
155°
171°
254°
264°
May
252°
174°
229°
230°
June
238°
237°
242°
195°
July
225°
252°
216°
238°
August
271°
254°
209°
243°
September
226°
257°
167°
269°
October
236°
240°
123°
197°
November
139°
019°
123°
141°
December
102°
032°
128°
094°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.