Wakefield
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Wakefield clear sky chart from 2005-11-06 to 2024-02-15.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.
Observation TypeMinimum conditions for hour to be usableOut of hours
Clear of CloudsTransparencySeeingSky Brightness
Planetary:50%(no limit)Average(no limit)Nighttime Hours
Deep Sky:70%Average(no limit)5.9Nighttime Hours
CCD Imaging:70%Below AveragePoor(no limit)Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

PlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
Night
27%
22656
13%
80578
8%
22567
35%
22567
14%
57529

By Month

MonthDays of MonthPlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
January1st to 10thNight
14%
754
7%
4409
2%
737
21%
737
4%
3316
January11th to 20thNight
16%
756
8%
4387
4%
740
22%
740
5%
3212
January21st to endNight
17%
831
8%
4769
7%
814
28%
814
6%
3814
February1st to 10thNight
17%
760
11%
2470
3%
760
26%
760
10%
1880
February11th to 20thNight
15%
722
14%
2334
4%
719
27%
719
12%
1717
February21st to endNight
20%
592
15%
1780
6%
592
32%
592
14%
1307
March1st to 10thNight
18%
720
15%
2156
7%
720
28%
720
13%
1622
March11th to 20thNight
20%
720
16%
1979
6%
720
30%
720
15%
1463
March21st to endNight
23%
792
21%
2066
7%
792
33%
792
19%
1453
April1st to 10thNight
22%
720
15%
1800
4%
720
28%
720
18%
1347
April11th to 20thNight
23%
711
17%
1775
6%
711
30%
711
20%
1296
April21st to endNight
26%
595
16%
1675
7%
595
33%
595
18%
1200
May1st to 10thNight
31%
360
19%
1440
16%
360
42%
360
16%
917
May11th to 20thNight
32%
354
21%
1416
18%
354
47%
354
18%
887
May21st to endNight
32%
389
13%
1551
10%
388
45%
388
21%
927
June1st to 10thNight
35%
360
10%
1440
10%
360
44%
360
17%
927
June11th to 20thNight
39%
360
12%
1440
14%
360
47%
360
19%
856
June21st to endNight
43%
360
10%
1440
13%
360
49%
360
17%
926
July1st to 10thNight
49%
350
14%
1400
17%
350
58%
350
26%
791
July11th to 20thNight
50%
348
16%
1392
23%
348
55%
348
25%
798
July21st to endNight
52%
394
15%
1486
17%
372
56%
372
24%
854
August1st to 10thNight
52%
388
16%
1452
15%
386
58%
386
23%
867
August11th to 20thNight
56%
534
18%
1598
13%
534
61%
534
31%
987
August21st to endNight
45%
787
18%
1975
7%
787
49%
787
31%
1319
September1st to 10thNight
45%
720
18%
1800
7%
720
49%
720
33%
1189
September11th to 20thNight
48%
720
22%
1800
12%
720
52%
720
32%
1178
September21st to endNight
39%
720
21%
2037
14%
720
45%
720
27%
1350
October1st to 10thNight
33%
720
18%
2160
11%
720
41%
720
20%
1469
October11th to 20thNight
26%
720
14%
2160
8%
720
34%
720
16%
1589
October21st to endNight
22%
792
12%
2520
6%
792
31%
792
13%
1882
November1st to 10thNight
28%
740
15%
2413
9%
740
36%
740
16%
1677
November11th to 20thNight
20%
760
14%
2660
8%
760
29%
760
12%
1955
November21st to endNight
19%
760
9%
2660
4%
760
26%
760
9%
2061
December1st to 10thNight
16%
760
8%
2660
4%
760
21%
760
7%
2133
December11th to 20thNight
16%
759
12%
3242
5%
759
25%
759
8%
2451
December21st to endNight
11%
828
6%
4836
1%
817
18%
817
4%
3912

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

Occurrence of each ForecastData
Points
Cloud CoverDay
18%10%47%6%35%5%5%6%31%
78156
Night
17%11%48%6%3445%6%31%
80922
TransparencyDay
54%5%12%19%10%1
77861
Night
55%5%11%19%9%1
80751
SeeingDay
24%16%31%19%8%2
13418
Night
24%14%28%25%9%1
22680

By Month

Percentage Cloud Cover NE (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
15%18%7%11%8%45%5%3420%
2517
11th to 20thDay
14%14%6%14%9%45%45%5%21%
2520
21st to endDay
13%18%7%11%9%5%6%44418%
2880
February1st to 10thDay
13%15%5%12%8%45%45%6%23%
1710
11th to 20thDay
12%16%6%10%6%35%45%5%28%
1609
21st to endDay
19%12%7%8%6%345%5%425%
1476
March1st to 10thDay
16%12%49%8%445%5%5%28%
1800
11th to 20thDay
15%13%49%7%44445%30%
1980
21st to endDay
19%9%47%5%34445%36%
2290
April1st to 10thDay
23%12%46%6%34436%31%
2160
11th to 20thDay
22%10%35%424445%36%
2134
21st to endDay
22%11%47%6%35%445%31%
2301
May1st to 10thDay
21%8%36%6%35%445%35%
2520
11th to 20thDay
17%7%47%6%34346%38%
2478
21st to endDay
17%6%36%6%45%5%5%7%36%
2725
June1st to 10thDay
22%8%36%5%36%6%5%6%29%
2520
11th to 20thDay
15%6%35%5%45%5%5%8%38%
2520
21st to endDay
19%7%35%6%46%6%6%7%31%
2520
July1st to 10thDay
13%5%35%6%45%6%7%9%38%
2520
11th to 20thDay
12%6%36%5%45%6%6%8%38%
2520
21st to endDay
13%5%35%5%36%5%6%9%39%
2744
August1st to 10thDay
12%6%26%6%46%6%6%9%38%
2473
11th to 20thDay
13%6%36%5%45%5%7%8%38%
2288
21st to endDay
15%6%35%5%346%6%9%39%
2376
September1st to 10thDay
15%5%35%5%35%5%6%7%42%
2160
11th to 20thDay
14%6%25%5%35%45%7%45%
2160
21st to endDay
18%7%26%5%345%5%7%39%
1919
October1st to 10thDay
22%8%36%6%2446%5%35%
1800
11th to 20thDay
25%10%37%5%45%448%25%
1800
21st to endDay
27%10%37%6%35%445%26%
1836
November1st to 10thDay
16%9%36%6%445%5%7%33%
1662
11th to 20thDay
20%13%47%7%35%447%24%
1520
21st to endDay
22%14%410%7%445%5%5%20%
1520
December1st to 10thDay
22%18%7%10%7%3345%6%15%
1520
11th to 20thDay
21%12%6%9%7%345%45%25%
1906
21st to endDay
27%19%5%9%6%3332318%
2772
January1st to 10thNight
17%18%7%10%7%35%445%20%
4429
11th to 20thNight
13%15%6%11%8%5%5%45%5%23%
4440
21st to endNight
15%19%7%11%8%5%434420%
4774
February1st to 10thNight
13%14%6%10%8%46%5%5%5%24%
2470
11th to 20thNight
13%13%6%11%7%35%5%45%28%
2332
21st to endNight
16%13%5%8%7%35%45%6%29%
1780
March1st to 10thNight
17%13%5%7%6%45%44429%
2146
11th to 20thNight
16%12%5%8%5%45%435%32%
1979
21st to endNight
16%10%37%6%33345%40%
2066
April1st to 10thNight
21%9%47%5%33446%32%
1800
11th to 20thNight
18%9%37%6%35%446%35%
1775
21st to endNight
21%10%46%5%25%45%6%32%
1675
May1st to 10thNight
21%8%25%5%24446%38%
1440
11th to 20thNight
18%8%45%434446%39%
1415
21st to endNight
13%6%26%5%35%5%48%44%
1550
June1st to 10thNight
18%5%25%6%35%6%6%9%34%
1440
11th to 20thNight
14%6%25%5%3446%8%42%
1440
21st to endNight
17%7%245%5%5%5%5%8%37%
1440
July1st to 10thNight
11%6%25%5%345%5%8%48%
1440
11th to 20thNight
12%6%35%4245%7%8%43%
1440
21st to endNight
9%5%245%46%5%7%9%43%
1574
August1st to 10thNight
10%6%27%5%35%47%8%43%
1462
11th to 20thNight
10%5%26%5%346%6%8%44%
1598
21st to endNight
12%6%26%5%345%5%7%44%
1975
September1st to 10thNight
12%6%15%6%345%5%7%46%
1800
11th to 20thNight
15%6%244345%5%6%48%
1800
21st to endNight
19%6%25%5%2335%6%43%
2037
October1st to 10thNight
20%8%26%5%3445%7%38%
2160
11th to 20thNight
22%8%26%8%35%5%5%6%30%
2160
21st to endNight
24%10%37%7%4445%5%28%
2520
November1st to 10thNight
19%10%46%6%35%45%6%33%
2413
11th to 20thNight
20%12%48%6%45%5%45%28%
2660
21st to endNight
21%13%5%9%7%45%446%23%
2660
December1st to 10thNight
21%16%6%9%8%35%5%45%17%
2660
11th to 20thNight
22%14%6%9%7%2433426%
3288
21st to endNight
28%18%5%9%6%3433418%
4884

Transparency (when cloud cover <= 30%)
Color Meanings:
Too cloudy to forecast Poor Below Average Average Above average Transparent
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
69%311%11%6%1
2518
11th to 20thDay
67%310%13%6%
2520
21st to endDay
69%6%9%11%6%1
2880
February1st to 10thDay
63%410%17%5%2
1710
11th to 20thDay
59%312%15%10%1
1618
21st to endDay
62%410%13%10%1
1476
March1st to 10thDay
58%49%18%10%1
1803
11th to 20thDay
57%411%14%11%3
1980
21st to endDay
51%38%19%14%5%
2290
April1st to 10thDay
57%36%18%12%3
2160
11th to 20thDay
51%37%22%15%2
2134
21st to endDay
57%47%14%13%4
2301
May1st to 10thDay
53%47%20%13%3
2520
11th to 20thDay
48%38%21%16%3
2482
21st to endDay
47%5%12%20%14%2
2725
June1st to 10thDay
54%6%10%19%11%1
2520
11th to 20thDay
44%5%11%25%12%2
2520
21st to endDay
50%6%14%20%9%1
2520
July1st to 10thDay
40%6%14%27%12%1
2450
11th to 20thDay
41%6%15%26%11%
2445
21st to endDay
41%7%16%26%9%
2591
August1st to 10thDay
44%6%17%25%9%
2459
11th to 20thDay
43%5%17%26%8%1
2288
21st to endDay
41%5%15%27%11%1
2376
September1st to 10thDay
40%5%14%28%12%
2160
11th to 20thDay
40%5%14%30%11%1
2160
21st to endDay
45%416%27%8%
1919
October1st to 10thDay
51%5%12%22%10%1
1800
11th to 20thDay
59%414%17%5%1
1800
21st to endDay
62%412%15%7%
1836
November1st to 10thDay
49%5%15%24%7%1
1662
11th to 20thDay
61%413%14%7%1
1520
21st to endDay
67%413%9%6%1
1520
December1st to 10thDay
71%412%10%3
1520
11th to 20thDay
62%6%12%14%5%
1906
21st to endDay
73%27%14%4
2772
January1st to 10thNight
67%415%11%3
4429
11th to 20thNight
62%5%14%14%5%
4440
21st to endNight
70%49%11%7%
4774
February1st to 10thNight
62%410%16%8%1
2470
11th to 20thNight
59%49%20%8%1
2334
21st to endNight
56%49%18%11%1
1780
March1st to 10thNight
59%48%18%9%2
2156
11th to 20thNight
56%39%17%12%2
1980
21st to endNight
49%38%20%15%5%
2066
April1st to 10thNight
54%49%18%14%2
1800
11th to 20thNight
50%46%22%16%2
1775
21st to endNight
53%38%17%15%4
1675
May1st to 10thNight
47%47%22%16%4
1440
11th to 20thNight
45%5%7%22%17%3
1416
21st to endNight
40%6%14%21%17%3
1551
June1st to 10thNight
46%6%13%26%8%1
1440
11th to 20thNight
40%6%12%26%14%2
1440
21st to endNight
45%7%13%21%13%1
1440
July1st to 10thNight
35%6%14%28%16%1
1400
11th to 20thNight
37%5%13%30%14%
1392
21st to endNight
35%8%16%28%13%
1486
August1st to 10thNight
38%7%18%24%12%
1452
11th to 20thNight
36%6%17%29%11%
1598
21st to endNight
39%6%16%29%10%
1975
September1st to 10thNight
37%6%12%30%14%1
1800
11th to 20thNight
37%6%13%34%10%1
1800
21st to endNight
44%312%31%9%
2037
October1st to 10thNight
47%5%10%24%13%
2160
11th to 20thNight
54%6%11%21%8%1
2160
21st to endNight
59%413%16%7%
2520
November1st to 10thNight
52%5%14%21%8%
2413
11th to 20thNight
59%411%17%8%1
2660
21st to endNight
64%412%16%4
2660
December1st to 10thNight
68%5%10%13%4
2660
11th to 20thNight
63%48%17%7%1
3288
21st to endNight
73%37%13%4
4884

Seeing (when cloud cover <= 80%)
Color Meanings:
Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
28%20%31%17%4
180
11th to 20thDay
29%19%37%12%21
180
21st to endDay
23%21%35%16%5%
231
February1st to 10thDay
33%24%31%10%2
270
11th to 20thDay
29%29%36%6%1
252
21st to endDay
32%23%29%14%1
342
March1st to 10thDay
26%21%34%14%5%
420
11th to 20thDay
27%23%30%15%41
420
21st to endDay
32%19%29%14%5%1
462
April1st to 10thDay
34%21%26%14%5%
420
11th to 20thDay
35%19%23%15%8%1
412
21st to endDay
31%21%30%13%5%
420
May1st to 10thDay
27%17%31%16%6%3
423
11th to 20thDay
23%18%32%19%6%2
447
21st to endDay
24%15%33%18%8%2
485
June1st to 10thDay
26%12%36%19%6%1
450
11th to 20thDay
19%14%31%24%9%3
450
21st to endDay
22%13%32%21%9%3
450
July1st to 10thDay
13%11%31%32%11%3
445
11th to 20thDay
14%11%34%26%13%3
444
21st to endDay
14%7%37%28%11%3
488
August1st to 10thDay
13%10%29%31%13%4
446
11th to 20thDay
17%5%26%32%13%8%
439
21st to endDay
16%14%29%25%12%6%
495
September1st to 10thDay
16%13%29%24%11%7%
450
11th to 20thDay
16%12%27%20%17%8%
450
21st to endDay
21%13%28%20%13%4
450
October1st to 10thDay
24%18%23%21%10%3
450
11th to 20thDay
30%17%32%14%7%1
450
21st to endDay
33%16%28%19%4
423
November1st to 10thDay
28%16%31%19%6%1
356
11th to 20thDay
28%28%30%11%3
180
21st to endDay
28%24%31%12%32
180
December1st to 10thDay
35%12%39%12%2
180
11th to 20thDay
29%26%33%9%21
180
21st to endDay
31%23%35%8%21
198
January1st to 10thNight
28%16%33%19%4
760
11th to 20thNight
30%17%28%20%5%
760
21st to endNight
20%15%36%24%5%1
836
February1st to 10thNight
21%21%30%24%3
760
11th to 20thNight
22%20%37%17%4
722
21st to endNight
26%18%29%23%4
592
March1st to 10thNight
26%16%33%21%3
720
11th to 20thNight
25%19%31%19%5%
720
21st to endNight
26%17%29%22%7%
792
April1st to 10thNight
28%17%26%24%5%
720
11th to 20thNight
26%18%27%21%7%1
711
21st to endNight
27%16%26%23%8%
595
May1st to 10thNight
25%12%26%28%8%1
360
11th to 20thNight
23%10%28%30%9%
354
21st to endNight
18%9%36%28%10%1
389
June1st to 10thNight
19%9%30%34%8%
360
11th to 20thNight
16%9%27%33%14%1
360
21st to endNight
18%8%23%36%14%
360
July1st to 10thNight
10%5%29%37%18%
350
11th to 20thNight
13%425%40%18%1
348
21st to endNight
10%5%27%41%15%2
394
August1st to 10thNight
12%421%43%20%1
388
11th to 20thNight
11%7%19%38%23%3
534
21st to endNight
15%7%26%32%18%2
787
September1st to 10thNight
15%7%29%29%19%1
720
11th to 20thNight
18%8%21%31%18%3
720
21st to endNight
21%8%26%25%18%2
720
October1st to 10thNight
24%12%25%23%15%1
720
11th to 20thNight
26%13%28%24%7%1
720
21st to endNight
30%14%28%24%5%
792
November1st to 10thNight
27%14%26%24%8%1
740
11th to 20thNight
27%17%31%16%9%
760
21st to endNight
32%16%25%21%6%
760
December1st to 10thNight
31%17%29%20%3
760
11th to 20thNight
27%20%27%20%5%1
760
21st to endNight
34%17%30%15%3
836
Page generated at 2024-02-12 06:35:31. Version ac07

Copyright 2024 Attilla Danko


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