Stokes Castle
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Stokes Castle 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
62%
23445
25%
80193
24%
23371
67%
23371
34%
44623

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
51%
747
16%
4368
18%
736
57%
736
15%
2700
January11th to 20thNight
55%
752
16%
4380
19%
740
62%
740
16%
2740
January21st to endNight
54%
829
14%
4652
23%
814
58%
814
15%
2903
February1st to 10thNight
53%
760
23%
2280
19%
760
58%
760
31%
1388
February11th to 20thNight
60%
718
26%
2152
24%
718
65%
718
38%
1222
February21st to endNight
54%
592
26%
1776
24%
592
60%
592
33%
1048
March1st to 10thNight
51%
720
21%
2160
18%
720
59%
720
30%
1341
March11th to 20thNight
58%
720
20%
2088
19%
720
62%
720
36%
1240
March21st to endNight
54%
792
19%
2034
12%
792
58%
792
35%
1276
April1st to 10thNight
54%
720
23%
1800
14%
720
58%
720
37%
1150
April11th to 20thNight
54%
711
27%
1779
14%
711
57%
711
40%
1086
April21st to endNight
60%
621
26%
1701
16%
621
64%
621
41%
974
May1st to 10thNight
58%
540
28%
1620
21%
540
61%
540
40%
873
May11th to 20thNight
59%
531
25%
1595
20%
531
61%
531
38%
866
May21st to endNight
57%
463
20%
1627
16%
463
64%
463
28%
923
June1st to 10thNight
70%
360
26%
1440
32%
360
75%
360
38%
663
June11th to 20thNight
67%
360
32%
1440
37%
360
76%
360
46%
592
June21st to endNight
75%
360
31%
1440
38%
360
84%
360
54%
546
July1st to 10thNight
74%
350
27%
1400
35%
350
76%
350
41%
614
July11th to 20thNight
73%
348
27%
1392
33%
348
76%
348
37%
653
July21st to endNight
75%
416
27%
1509
33%
393
75%
393
35%
754
August1st to 10thNight
66%
537
32%
1602
25%
534
68%
534
43%
837
August11th to 20thNight
79%
709
32%
1777
20%
709
81%
709
60%
932
August21st to endNight
80%
792
37%
1980
23%
792
81%
792
62%
1015
September1st to 10thNight
79%
720
38%
1800
25%
720
82%
720
62%
916
September11th to 20thNight
76%
720
36%
1952
29%
720
79%
720
55%
993
September21st to endNight
77%
720
40%
1980
35%
720
81%
720
62%
940
October1st to 10thNight
68%
720
32%
1980
26%
720
74%
720
49%
1049
October11th to 20thNight
71%
720
38%
2109
35%
720
76%
720
56%
1000
October21st to endNight
72%
792
37%
2574
37%
792
79%
792
53%
1163
November1st to 10thNight
65%
740
29%
2405
31%
740
69%
740
41%
1224
November11th to 20thNight
66%
760
32%
2470
28%
760
75%
760
45%
1214
November21st to endNight
61%
760
27%
2470
26%
760
66%
760
36%
1358
December1st to 10thNight
58%
760
21%
2508
21%
760
61%
760
31%
1434
December11th to 20thNight
51%
760
20%
3161
21%
758
56%
758
20%
1956
December21st to endNight
42%
825
11%
4792
17%
817
48%
817
12%
3040

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
36%36%5%3445%7%54%
78341
Night
46%36%5%3445%8%51%
80743
TransparencyDay
27%6%10%19%21%17%
78047
Night
29%7%11%19%20%14%
80559
SeeingDay
7%8%23%30%23%8%
13847
Night
6%5%17%42%25%4
23490

By Month

Percentage Cloud Cover SW (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
312%7%13%10%2445%8%33%
2539
11th to 20thDay
310%5%10%7%45%5%6%8%37%
2540
21st to endDay
310%7%10%5%35%6%9%11%31%
2883
February1st to 10thDay
38%48%6%3445%9%46%
1900
11th to 20thDay
46%48%6%345%6%9%45%
1791
21st to endDay
28%48%5%446%6%7%47%
1480
March1st to 10thDay
49%5%7%5%5%45%7%10%39%
1800
11th to 20thDay
27%47%5%46%5%6%9%45%
1872
21st to endDay
49%47%435%5%6%10%43%
2318
April1st to 10thDay
38%46%6%35%5%5%7%49%
2160
11th to 20thDay
47%35%5%3445%7%52%
2129
21st to endDay
5%8%35%42445%7%54%
2258
May1st to 10thDay
45%2443446%8%55%
2340
11th to 20thDay
6%7%25%5%35%45%7%51%
2301
21st to endDay
6%8%26%6%446%47%46%
2644
June1st to 10thDay
4414435%5%6%7%57%
2520
11th to 20thDay
3313423346%69%
2520
21st to endDay
2313423335%71%
2520
July1st to 10thDay
2224434447%63%
2520
11th to 20thDay
442343445%5%63%
2520
21st to endDay
5%426%435%45%7%55%
2719
August1st to 10thDay
331443445%5%63%
2328
11th to 20thDay
3313323436%69%
2122
21st to endDay
2213223235%74%
2376
September1st to 10thDay
2312323335%73%
2160
11th to 20thDay
2223323345%69%
2008
21st to endDay
3322322235%72%
1980
October1st to 10thDay
45%24423346%63%
1980
11th to 20thDay
3424323346%66%
1846
21st to endDay
342431336%6%65%
1782
November1st to 10thDay
37%25%4345%6%9%53%
1674
11th to 20thDay
35%245%2445%8%56%
1710
21st to endDay
37%47%43445%8%50%
1710
December1st to 10thDay
46%35%5%35%5%5%8%52%
1669
11th to 20thDay
411%410%8%45%6%6%10%33%
1928
21st to endDay
39%5%7%7%5%6%5%7%9%37%
2794
January1st to 10thNight
29%5%11%10%5%5%5%6%9%33%
4406
11th to 20thNight
310%6%11%9%45%45%9%34%
4420
21st to endNight
411%5%9%7%45%6%8%12%29%
4755
February1st to 10thNight
49%5%9%6%2435%8%47%
2280
11th to 20thNight
36%37%5%25%5%7%11%45%
2151
21st to endNight
26%47%7%446%6%8%46%
1776
March1st to 10thNight
38%47%6%45%6%7%9%42%
2160
11th to 20thNight
27%37%5%35%5%7%10%46%
2088
21st to endNight
49%45%5%35%5%6%8%46%
2034
April1st to 10thNight
47%46%5%35%5%6%7%48%
1800
11th to 20thNight
47%35%5%3445%6%54%
1779
21st to endNight
6%8%2442335%7%55%
1701
May1st to 10thNight
45%345%245%5%8%55%
1620
11th to 20thNight
6%6%35%5%3335%7%54%
1594
21st to endNight
6%6%35%5%45%5%6%7%47%
1627
June1st to 10thNight
43234345%7%6%58%
1440
11th to 20thNight
4314313345%68%
1440
21st to endNight
2313323445%71%
1440
July1st to 10thNight
432443446%7%60%
1440
11th to 20thNight
34345%35%5%5%5%58%
1440
21st to endNight
46%25%5%35%5%6%7%52%
1598
August1st to 10thNight
5%425%4345%5%6%58%
1611
11th to 20thNight
2314424445%68%
1777
21st to endNight
321332334471%
1980
September1st to 10thNight
3213323335%72%
1800
11th to 20thNight
3314323345%67%
1952
21st to endNight
431222333375%
1980
October1st to 10thNight
6%41343343464%
1980
11th to 20thNight
3323323345%69%
2109
21st to endNight
4413323345%69%
2574
November1st to 10thNight
46%25%32345%7%59%
2405
11th to 20thNight
35%2443345%8%60%
2470
21st to endNight
35%37%5%35%5%5%8%51%
2470
December1st to 10thNight
36%47%7%3446%7%50%
2508
11th to 20thNight
49%49%7%35%5%7%13%35%
3276
21st to endNight
48%5%12%9%5%7%6%6%9%30%
4862

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
44%10%16%20%9%1
2539
11th to 20thDay
41%8%16%21%9%5%
2540
21st to endDay
42%11%15%18%11%2
2883
February1st to 10thDay
34%6%13%26%15%6%
1900
11th to 20thDay
33%5%12%23%22%5%
1801
21st to endDay
32%7%14%23%20%3
1480
March1st to 10thDay
38%5%13%26%15%2
1800
11th to 20thDay
33%6%14%25%17%5%
1872
21st to endDay
33%8%20%24%12%3
2318
April1st to 10thDay
33%6%13%22%18%7%
2160
11th to 20thDay
31%6%11%24%22%7%
2132
21st to endDay
29%6%10%31%22%3
2258
May1st to 10thDay
25%5%9%26%29%6%
2340
11th to 20thDay
31%6%9%23%24%7%
2304
21st to endDay
35%7%9%21%22%6%
2644
June1st to 10thDay
23%6%10%17%27%16%
2520
11th to 20thDay
17%36%15%32%27%
2520
21st to endDay
15%35%11%27%39%
2520
July1st to 10thDay
20%37%10%18%42%
2451
11th to 20thDay
20%45%10%18%43%
2445
21st to endDay
26%5%6%11%19%34%
2568
August1st to 10thDay
20%45%10%16%44%
2313
11th to 20thDay
16%35%11%22%43%
2122
21st to endDay
15%2410%29%41%
2376
September1st to 10thDay
15%3410%25%44%
2160
11th to 20thDay
16%46%16%28%31%
2008
21st to endDay
17%2414%31%32%
1980
October1st to 10thDay
23%47%13%32%20%
1980
11th to 20thDay
19%45%20%30%21%
1846
21st to endDay
19%37%23%33%14%
1782
November1st to 10thDay
26%5%10%25%23%11%
1674
11th to 20thDay
24%5%12%23%29%8%
1710
21st to endDay
32%5%9%24%23%7%
1710
December1st to 10thDay
28%7%16%23%19%7%
1669
11th to 20thDay
41%11%10%19%15%4
1928
21st to endDay
37%10%16%18%15%4
2794
January1st to 10thNight
41%11%15%21%11%1
4406
11th to 20thNight
42%9%15%17%11%5%
4420
21st to endNight
40%12%15%19%12%3
4755
February1st to 10thNight
36%5%12%27%16%5%
2280
11th to 20thNight
27%7%14%23%23%5%
2152
21st to endNight
30%9%15%22%20%4
1776
March1st to 10thNight
34%8%14%22%19%3
2160
11th to 20thNight
31%7%15%24%19%5%
2088
21st to endNight
33%7%19%25%13%3
2034
April1st to 10thNight
33%7%13%25%16%7%
1800
11th to 20thNight
29%7%10%26%21%8%
1779
21st to endNight
27%5%11%28%25%4
1701
May1st to 10thNight
24%7%9%24%29%8%
1620
11th to 20thNight
27%5%10%21%29%8%
1595
21st to endNight
31%8%11%23%21%5%
1627
June1st to 10thNight
21%7%10%21%27%13%
1440
11th to 20thNight
18%35%16%34%24%
1440
21st to endNight
14%35%13%27%38%
1440
July1st to 10thNight
22%47%9%21%38%
1400
11th to 20thNight
24%5%7%8%15%41%
1392
21st to endNight
27%5%9%11%13%35%
1509
August1st to 10thNight
24%5%5%12%13%40%
1602
11th to 20thNight
17%36%11%21%42%
1777
21st to endNight
16%35%8%25%43%
1980
September1st to 10thNight
15%4410%24%43%
1800
11th to 20thNight
18%45%14%26%33%
1952
21st to endNight
15%2414%30%35%
1980
October1st to 10thNight
22%47%18%27%22%
1980
11th to 20thNight
18%37%19%32%22%
2109
21st to endNight
17%47%26%33%13%
2574
November1st to 10thNight
23%6%11%22%26%11%
2405
11th to 20thNight
21%5%11%25%31%8%
2470
21st to endNight
29%5%10%24%25%6%
2470
December1st to 10thNight
32%7%14%22%18%7%
2508
11th to 20thNight
36%11%12%20%14%6%
3276
21st to endNight
44%11%12%16%13%4
4862

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
14%8%27%32%15%4
180
11th to 20thDay
8%10%27%26%20%9%
180
21st to endDay
12%5%12%33%28%11%
256
February1st to 10thDay
6%11%26%31%18%7%
460
11th to 20thDay
8%8%27%33%21%4
432
21st to endDay
5%11%29%37%17%2
346
March1st to 10thDay
10%9%24%38%19%1
420
11th to 20thDay
5%11%24%33%22%5%
420
21st to endDay
12%11%26%35%14%3
462
April1st to 10thDay
6%12%25%31%22%4
420
11th to 20thDay
10%12%28%30%14%6%
412
21st to endDay
10%12%27%25%19%8%
420
May1st to 10thDay
7%12%31%29%16%5%
423
11th to 20thDay
14%10%24%27%21%5%
448
21st to endDay
14%10%18%26%21%11%
485
June1st to 10thDay
7%10%25%24%23%12%
450
11th to 20thDay
8%14%26%27%18%7%
450
21st to endDay
48%24%31%25%8%
450
July1st to 10thDay
25%25%27%28%11%
446
11th to 20thDay
5%321%30%28%13%
444
21st to endDay
5%318%32%29%13%
487
August1st to 10thDay
7%320%31%23%15%
447
11th to 20thDay
5%422%29%24%16%
437
21st to endDay
46%22%30%28%11%
495
September1st to 10thDay
45%21%29%25%16%
450
11th to 20thDay
6%9%24%25%25%12%
450
21st to endDay
8%6%22%28%28%8%
450
October1st to 10thDay
8%11%19%28%22%12%
450
11th to 20thDay
8%6%19%31%26%10%
442
21st to endDay
8%6%18%31%29%8%
297
November1st to 10thDay
7%6%23%32%24%7%
270
11th to 20thDay
47%19%36%27%7%
270
21st to endDay
11%7%16%36%24%6%
270
December1st to 10thDay
6%8%22%33%22%8%
250
11th to 20thDay
7%9%22%34%26%3
180
21st to endDay
12%8%26%32%17%6%
198
January1st to 10thNight
8%7%23%35%22%5%
760
11th to 20thNight
5%6%24%41%21%4
760
21st to endNight
9%5%17%44%20%5%
836
February1st to 10thNight
8%7%21%41%20%4
760
11th to 20thNight
5%7%20%44%21%3
722
21st to endNight
5%6%24%47%16%2
592
March1st to 10thNight
6%7%24%44%17%2
720
11th to 20thNight
6%5%19%40%26%4
720
21st to endNight
10%7%21%42%19%2
792
April1st to 10thNight
8%7%23%43%19%2
720
11th to 20thNight
8%9%21%38%20%5%
711
21st to endNight
10%7%16%41%22%4
621
May1st to 10thNight
6%8%22%43%18%3
540
11th to 20thNight
9%7%16%38%26%3
531
21st to endNight
8%8%16%37%28%4
465
June1st to 10thNight
5%314%44%30%4
360
11th to 20thNight
4417%45%27%2
360
21st to endNight
3213%49%29%4
360
July1st to 10thNight
419%47%35%3
350
11th to 20thNight
418%47%36%3
348
21st to endNight
6%25%46%39%1
416
August1st to 10thNight
6%313%45%31%2
537
11th to 20thNight
328%45%37%6%
709
21st to endNight
419%43%39%4
792
September1st to 10thNight
429%39%41%6%
720
11th to 20thNight
448%40%34%9%
720
21st to endNight
6%212%39%35%6%
720
October1st to 10thNight
8%414%42%28%5%
720
11th to 20thNight
6%414%39%32%6%
720
21st to endNight
6%415%39%30%6%
792
November1st to 10thNight
7%318%41%24%6%
740
11th to 20thNight
4419%47%21%4
760
21st to endNight
5%6%21%39%24%5%
760
December1st to 10thNight
7%6%21%44%18%5%
760
11th to 20thNight
8%7%22%43%19%1
760
21st to endNight
10%10%24%41%14%2
836
Page generated at 2024-02-12 03:35:35. Version ac07

Copyright 2024 Attilla Danko


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