Eckley Miners' Village
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Eckley Miners' Village clear sky chart from 2005-11-06 to 2024-03-23.

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
28%
23392
16%
80757
8%
23286
38%
23286
16%
53712

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
12%
759
17%
4355
5%
737
27%
737
7%
2626
January11th to 20thNight
16%
760
13%
4316
3%
740
29%
740
7%
2938
January21st to endNight
12%
833
10%
4508
3%
814
28%
814
7%
3218
February1st to 10thNight
14%
760
16%
2470
5%
760
28%
760
13%
1668
February11th to 20thNight
8%
743
15%
2316
1%
740
24%
740
11%
1604
February21st to endNight
12%
628
18%
1884
4%
628
28%
628
13%
1320
March1st to 10thNight
15%
760
18%
2242
6%
760
30%
760
16%
1498
March11th to 20thNight
18%
760
20%
2090
6%
760
31%
760
17%
1392
March21st to endNight
16%
801
18%
2099
5%
801
27%
801
17%
1479
April1st to 10thNight
19%
720
15%
1800
3%
720
26%
720
17%
1311
April11th to 20thNight
23%
711
16%
1775
4%
711
29%
711
23%
1237
April21st to endNight
23%
720
17%
1800
5%
720
30%
720
22%
1254
May1st to 10thNight
28%
518
15%
1598
9%
518
34%
518
18%
1126
May11th to 20thNight
29%
354
19%
1416
10%
354
44%
354
16%
902
May21st to endNight
41%
388
13%
1551
12%
388
47%
388
16%
998
June1st to 10thNight
45%
360
17%
1440
17%
360
56%
360
20%
880
June11th to 20thNight
41%
360
13%
1440
11%
360
50%
360
19%
886
June21st to endNight
49%
360
16%
1440
16%
360
58%
360
27%
826
July1st to 10thNight
49%
350
14%
1400
16%
350
53%
350
20%
884
July11th to 20thNight
58%
348
16%
1392
17%
348
63%
348
22%
816
July21st to endNight
52%
436
15%
1526
13%
412
57%
412
23%
916
August1st to 10thNight
56%
537
15%
1600
11%
534
58%
534
28%
1027
August11th to 20thNight
53%
631
15%
1695
9%
631
55%
631
25%
1167
August21st to endNight
51%
792
19%
1980
9%
792
54%
792
30%
1326
September1st to 10thNight
43%
720
20%
1800
9%
720
48%
720
30%
1224
September11th to 20thNight
47%
720
27%
1800
16%
720
52%
720
34%
1151
September21st to endNight
43%
720
23%
2024
16%
720
51%
720
26%
1334
October1st to 10thNight
39%
720
16%
2160
11%
720
46%
720
23%
1422
October11th to 20thNight
32%
720
19%
2160
10%
720
44%
720
23%
1404
October21st to endNight
24%
792
19%
2425
10%
792
37%
792
18%
1628
November1st to 10thNight
28%
740
21%
2407
11%
740
43%
740
22%
1460
November11th to 20thNight
23%
760
21%
2482
10%
760
37%
760
17%
1605
November21st to endNight
20%
760
17%
2660
6%
760
35%
760
15%
1717
December1st to 10thNight
15%
760
13%
2660
5%
760
25%
760
10%
1898
December11th to 20thNight
16%
760
14%
3221
4%
759
29%
759
10%
2185
December21st to endNight
15%
831
9%
4825
4%
817
29%
817
6%
3385

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
16%8%46%6%35%5%6%7%34%
78670
Night
16%8%36%5%35%5%5%7%37%
81208
TransparencyDay
46%8%13%20%12%2
78378
Night
44%8%14%21%12%2
81034
SeeingDay
24%20%28%18%8%2
13969
Night
21%18%28%23%9%1
23402

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
13%13%5%6%6%3445%5%35%
2517
11th to 20thDay
13%15%9%12%7%44445%23%
2588
21st to endDay
19%14%6%8%7%34445%25%
3124
February1st to 10thDay
16%9%5%8%6%45%5%6%6%30%
1710
11th to 20thDay
14%9%37%7%46%6%6%6%32%
1750
21st to endDay
17%12%48%6%45%445%31%
1570
March1st to 10thDay
15%8%47%7%35%5%5%7%35%
1932
11th to 20thDay
13%9%47%7%46%45%8%34%
2090
21st to endDay
19%10%47%5%34446%35%
2300
April1st to 10thDay
15%9%47%6%36%5%5%6%34%
2160
11th to 20thDay
15%10%37%6%34446%38%
2134
21st to endDay
16%8%37%5%35%5%6%7%36%
2160
May1st to 10thDay
20%7%36%6%36%5%6%6%32%
2377
11th to 20thDay
19%8%36%6%44446%34%
2478
21st to endDay
15%6%36%5%35%5%6%8%37%
2725
June1st to 10thDay
15%6%35%7%36%5%7%9%35%
2520
11th to 20thDay
15%7%35%7%46%5%6%9%33%
2520
21st to endDay
13%6%36%6%45%5%6%9%36%
2520
July1st to 10thDay
12%6%36%7%36%6%6%9%35%
2520
11th to 20thDay
10%5%25%6%36%6%7%9%40%
2520
21st to endDay
13%7%36%7%46%6%6%8%35%
2699
August1st to 10thDay
12%7%36%7%46%6%7%9%33%
2327
11th to 20thDay
13%8%36%6%45%6%6%8%35%
2185
21st to endDay
15%7%345%35%6%6%8%38%
2376
September1st to 10thDay
17%5%36%5%345%6%7%39%
2160
11th to 20thDay
14%5%244245%6%6%47%
2160
21st to endDay
18%8%35%5%445%5%6%37%
1933
October1st to 10thDay
19%6%35%43446%7%39%
1800
11th to 20thDay
17%7%35%5%35%45%7%38%
1800
21st to endDay
20%9%46%5%25%45%6%33%
1930
November1st to 10thDay
14%8%36%423347%46%
1671
11th to 20thDay
15%10%36%5%35%5%5%6%37%
1696
21st to endDay
19%8%36%435%46%7%36%
1520
December1st to 10thDay
18%11%49%6%5%5%36%5%29%
1520
11th to 20thDay
20%10%5%6%4345%5%5%32%
1906
21st to endDay
17%12%6%10%8%46%6%5%5%22%
2772
January1st to 10thNight
15%8%36%5%45%5%5%8%35%
4429
11th to 20thNight
15%12%6%10%6%35%445%29%
4369
21st to endNight
21%12%5%6%7%3445%6%27%
4532
February1st to 10thNight
15%10%46%5%345%6%6%35%
2470
11th to 20thNight
14%9%47%6%36%6%5%7%32%
2314
21st to endNight
17%9%47%6%36%45%7%32%
1884
March1st to 10thNight
16%8%35%5%45%5%5%7%38%
2232
11th to 20thNight
14%9%35%5%3446%7%40%
2089
21st to endNight
16%8%27%6%36%5%47%36%
2099
April1st to 10thNight
15%8%47%6%46%6%5%7%32%
1800
11th to 20thNight
15%7%36%6%345%47%39%
1775
21st to endNight
19%7%35%43445%6%41%
1800
May1st to 10thNight
19%10%37%5%2445%6%34%
1598
11th to 20thNight
16%7%35%5%35%5%5%7%39%
1415
21st to endNight
12%7%36%7%35%5%5%8%38%
1550
June1st to 10thNight
15%6%25%5%3447%8%42%
1440
11th to 20thNight
13%7%25%5%25%7%5%9%40%
1440
21st to endNight
12%5%24335%47%10%45%
1440
July1st to 10thNight
11%6%35%6%35%5%6%9%41%
1440
11th to 20thNight
10%6%34435%6%7%8%44%
1440
21st to endNight
11%5%245%35%5%7%9%43%
1616
August1st to 10thNight
12%5%25%436%5%7%9%42%
1611
11th to 20thNight
12%7%27%5%446%7%8%39%
1695
21st to endNight
14%5%25%4445%5%8%44%
1980
September1st to 10thNight
16%5%345%2445%6%45%
1800
11th to 20thNight
11%6%35%424346%50%
1800
21st to endNight
17%6%35%5%33446%43%
2024
October1st to 10thNight
19%7%345%33446%42%
2160
11th to 20thNight
15%8%26%5%34446%44%
2160
21st to endNight
20%8%35%4345%5%6%37%
2425
November1st to 10thNight
12%6%25%5%445%5%6%47%
2407
11th to 20thNight
16%8%35%5%345%5%6%39%
2482
21st to endNight
14%7%35%6%45%5%6%7%37%
2660
December1st to 10thNight
19%10%48%6%45%5%5%6%29%
2660
11th to 20thNight
17%11%45%5%35%5%6%6%32%
3288
21st to endNight
19%11%5%8%6%35%5%5%7%28%
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
46%8%16%21%7%2
2518
11th to 20thDay
58%9%11%14%7%1
2588
21st to endDay
58%8%10%17%7%1
3124
February1st to 10thDay
51%8%13%17%10%1
1710
11th to 20thDay
48%9%11%21%10%1
1759
21st to endDay
53%6%11%20%8%2
1570
March1st to 10thDay
46%7%15%21%9%2
1935
11th to 20thDay
47%7%12%20%12%2
2090
21st to endDay
50%6%10%17%14%3
2300
April1st to 10thDay
47%9%9%19%12%3
2160
11th to 20thDay
45%7%10%22%13%3
2134
21st to endDay
45%8%10%19%14%4
2160
May1st to 10thDay
50%8%10%17%13%3
2377
11th to 20thDay
50%8%10%17%13%2
2482
21st to endDay
43%10%14%19%12%2
2725
June1st to 10thDay
44%9%15%20%12%1
2520
11th to 20thDay
45%9%14%20%10%2
2520
21st to endDay
41%9%14%25%11%
2520
July1st to 10thDay
43%9%14%20%13%1
2450
11th to 20thDay
36%9%16%25%12%1
2445
21st to endDay
44%8%12%20%14%2
2548
August1st to 10thDay
43%9%15%20%12%
2314
11th to 20thDay
43%10%16%20%11%1
2185
21st to endDay
41%9%12%20%16%2
2376
September1st to 10thDay
43%7%13%19%16%2
2160
11th to 20thDay
35%6%11%23%22%2
2160
21st to endDay
46%6%10%17%19%2
1933
October1st to 10thDay
44%7%13%21%14%2
1800
11th to 20thDay
44%7%11%24%14%1
1800
21st to endDay
48%8%12%18%11%2
1930
November1st to 10thDay
38%6%14%23%17%2
1671
11th to 20thDay
46%7%12%20%14%2
1696
21st to endDay
44%8%14%25%8%1
1520
December1st to 10thDay
56%7%15%14%8%1
1520
11th to 20thDay
50%8%17%19%6%
1906
21st to endDay
57%11%12%15%5%
2772
January1st to 10thNight
43%9%16%23%8%2
4429
11th to 20thNight
50%10%15%17%7%1
4369
21st to endNight
54%8%12%16%8%1
4532
February1st to 10thNight
45%8%15%22%9%1
2470
11th to 20thNight
46%9%13%19%11%2
2316
21st to endNight
48%7%11%19%12%3
1884
March1st to 10thNight
42%8%15%21%11%3
2242
11th to 20thNight
41%7%15%22%13%2
2090
21st to endNight
45%8%11%17%16%3
2099
April1st to 10thNight
47%7%12%20%12%2
1800
11th to 20thNight
42%8%12%21%17%1
1775
21st to endNight
42%8%11%20%16%3
1800
May1st to 10thNight
48%7%11%20%12%2
1598
11th to 20thNight
42%9%12%18%16%2
1416
21st to endNight
42%10%17%16%12%3
1551
June1st to 10thNight
40%7%11%25%16%
1440
11th to 20thNight
38%10%16%23%11%1
1440
21st to endNight
32%9%16%30%12%1
1440
July1st to 10thNight
40%10%13%22%13%2
1400
11th to 20thNight
33%11%17%24%13%1
1392
21st to endNight
35%11%18%19%16%1
1526
August1st to 10thNight
35%11%16%24%13%1
1600
11th to 20thNight
41%10%15%19%14%1
1695
21st to endNight
36%9%13%22%18%2
1980
September1st to 10thNight
40%6%12%25%15%2
1800
11th to 20thNight
35%6%11%25%22%2
1800
21st to endNight
41%6%10%23%20%2
2024
October1st to 10thNight
42%7%14%22%14%1
2160
11th to 20thNight
40%7%13%26%12%2
2160
21st to endNight
44%7%12%23%13%1
2425
November1st to 10thNight
36%7%13%22%18%3
2407
11th to 20thNight
42%6%13%22%13%3
2482
21st to endNight
42%8%14%24%10%1
2660
December1st to 10thNight
52%8%14%18%7%1
2660
11th to 20thNight
47%9%15%18%10%1
3288
21st to endNight
52%10%13%19%5%
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
33%28%29%8%21
180
11th to 20thDay
41%27%26%7%1
200
21st to endDay
26%32%30%9%2
297
February1st to 10thDay
32%34%27%6%1
270
11th to 20thDay
34%30%30%5%1
357
21st to endDay
34%27%28%10%1
382
March1st to 10thDay
33%26%27%11%3
460
11th to 20thDay
30%29%27%10%21
460
21st to endDay
33%28%22%12%41
470
April1st to 10thDay
29%28%26%12%5%
420
11th to 20thDay
26%25%27%12%7%2
412
21st to endDay
28%24%32%11%42
420
May1st to 10thDay
30%23%27%11%7%2
423
11th to 20thDay
22%21%34%16%5%2
447
21st to endDay
20%13%27%25%13%3
485
June1st to 10thDay
18%17%30%24%8%2
450
11th to 20thDay
20%17%29%23%9%2
450
21st to endDay
13%17%36%23%10%2
450
July1st to 10thDay
12%10%29%27%17%5%
445
11th to 20thDay
11%8%30%31%18%3
444
21st to endDay
15%12%32%28%11%3
488
August1st to 10thDay
13%9%26%28%18%6%
446
11th to 20thDay
13%9%27%28%18%5%
439
21st to endDay
16%11%27%24%13%8%
495
September1st to 10thDay
20%13%22%23%16%7%
450
11th to 20thDay
14%10%31%21%16%8%
450
21st to endDay
25%14%26%20%11%4
450
October1st to 10thDay
26%12%23%23%12%4
450
11th to 20thDay
22%20%29%21%7%1
450
21st to endDay
26%21%32%15%6%1
470
November1st to 10thDay
22%20%25%22%8%2
365
11th to 20thDay
26%26%28%15%4
356
21st to endDay
31%27%32%9%1
180
December1st to 10thDay
38%28%23%6%41
180
11th to 20thDay
41%24%24%9%2
180
21st to endDay
33%25%32%8%2
198
January1st to 10thNight
24%29%33%12%3
760
11th to 20thNight
26%25%30%18%2
760
21st to endNight
20%28%34%16%2
836
February1st to 10thNight
26%25%31%17%1
760
11th to 20thNight
28%28%33%10%1
743
21st to endNight
30%25%31%12%2
628
March1st to 10thNight
26%24%32%14%3
760
11th to 20thNight
26%26%29%15%41
760
21st to endNight
21%27%33%14%4
801
April1st to 10thNight
24%23%31%18%4
720
11th to 20thNight
21%21%32%21%6%
711
21st to endNight
25%18%30%22%5%
720
May1st to 10thNight
25%16%27%23%8%1
518
11th to 20thNight
19%12%36%26%7%
354
21st to endNight
18%9%24%36%13%1
389
June1st to 10thNight
17%7%25%36%16%
360
11th to 20thNight
15%9%27%36%12%1
360
21st to endNight
12%6%30%41%12%
360
July1st to 10thNight
13%5%24%39%18%1
350
11th to 20thNight
11%6%19%44%17%2
348
21st to endNight
14%326%38%17%2
436
August1st to 10thNight
15%318%40%23%2
537
11th to 20thNight
14%6%15%40%23%2
631
21st to endNight
15%6%22%32%23%1
792
September1st to 10thNight
18%7%24%31%19%2
720
11th to 20thNight
13%6%27%28%21%5%
720
21st to endNight
20%11%21%32%15%2
720
October1st to 10thNight
24%10%23%26%15%3
720
11th to 20thNight
20%14%31%28%7%
720
21st to endNight
26%18%29%21%6%
792
November1st to 10thNight
17%19%32%22%10%1
740
11th to 20thNight
25%20%29%20%6%1
760
21st to endNight
20%23%33%19%5%
760
December1st to 10thNight
28%24%28%15%5%
760
11th to 20thNight
24%24%32%17%3
760
21st to endNight
24%26%31%17%2
836
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