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 2005-11-05 to 2018-02-14.

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
29%
15619
17%
48819
8%
15585
39%
15585
19%
32369

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 15thNight
16%
780
15%
2716
6%
776
29%
776
12%
1828
January16th to endNight
13%
832
17%
2738
3%
832
30%
832
14%
1818
February1st to 15thNight
10%
760
13%
2468
2%
757
25%
757
11%
1715
February16th to endNight
13%
631
19%
1896
4%
631
31%
631
13%
1286
March1st to 15thNight
17%
720
17%
2076
6%
720
30%
720
16%
1414
March16th to endNight
19%
768
19%
2043
6%
768
30%
768
18%
1392
April1st to 15thNight
20%
718
14%
1796
4%
718
26%
718
19%
1293
April16th to endNight
27%
720
17%
1800
4%
720
33%
720
25%
1212
May1st to 15thNight
32%
465
18%
1545
10%
465
41%
465
18%
1042
May16th to endNight
41%
374
14%
1497
11%
374
48%
374
17%
954
June1st to 15thNight
43%
360
15%
1440
14%
360
53%
360
19%
906
June16th to endNight
51%
360
15%
1440
15%
360
60%
360
26%
826
July1st to 15thNight
52%
340
13%
1360
16%
340
55%
340
20%
852
July16th to endNight
59%
405
14%
1445
13%
381
63%
381
25%
838
August1st to 15thNight
57%
545
17%
1615
12%
542
59%
542
29%
1022
August16th to endNight
56%
764
20%
1910
10%
764
59%
764
32%
1246
September1st to 15thNight
44%
720
22%
1800
11%
720
49%
720
31%
1205
September16th to endNight
50%
717
26%
1950
19%
717
56%
717
32%
1230
October1st to 15thNight
40%
720
19%
2160
14%
720
48%
720
24%
1394
October16th to endNight
27%
768
21%
2337
10%
768
41%
768
21%
1512
November1st to 15thNight
28%
760
18%
2472
9%
760
40%
760
19%
1596
November16th to endNight
23%
780
18%
2673
8%
780
36%
780
15%
1752
December1st to 15thNight
17%
780
11%
2730
4%
780
26%
780
10%
1979
December16th to endNight
14%
832
14%
2912
2%
832
29%
832
10%
2057

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
15%7%36%5%35%5%5%7%34%
49262
Night
14%7%35%5%3445%7%38%
48992
Cloud CoverDay
15%7%36%5%35%5%5%7%35%
49272
Night
15%6%25%5%3445%7%39%
48997
TransparencyDay
47%7%12%19%12%1
48953
Night
43%7%13%21%13%1
48819
SeeingDay
21%17%26%19%11%4
6096
Night
20%16%28%23%9%1
15620

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 15thDay
12%8%47%8%35%5%6%6%30%
1552
16th to endDay
11%10%5%8%8%35%5%5%6%28%
1836
February1st to 15thDay
15%8%48%6%4446%6%28%
1695
16th to endDay
13%10%46%7%46%5%45%30%
1575
March1st to 15thDay
15%7%47%6%26%5%6%7%30%
1870
16th to endDay
17%9%46%5%34346%35%
2180
April1st to 15thDay
17%8%46%5%25%445%35%
2152
16th to endDay
13%7%26%5%3345%7%39%
2160
May1st to 15thDay
21%6%35%6%35%35%5%33%
2418
16th to endDay
16%7%46%5%35%5%6%6%33%
2618
June1st to 15thDay
15%6%35%6%26%5%6%9%31%
2520
16th to endDay
13%6%26%6%36%5%5%8%34%
2520
July1st to 15thDay
12%6%26%6%36%6%5%8%34%
2520
16th to endDay
10%6%25%6%46%6%7%8%35%
2624
August1st to 15thDay
14%7%26%6%45%6%6%8%31%
2320
16th to endDay
14%6%344345%5%7%39%
2292
September1st to 15thDay
15%5%26%5%3445%7%39%
2160
16th to endDay
15%6%25%433446%44%
2008
October1st to 15thDay
17%6%25%5%3435%7%38%
1800
16th to endDay
18%7%35%425%446%36%
1887
November1st to 15thDay
15%9%36%5%23436%39%
1716
16th to endDay
19%6%25%42435%6%38%
1615
December1st to 15thDay
16%9%37%5%35%46%6%29%
1560
16th to endDay
14%10%49%5%45%6%5%5%27%
1664
January1st to 15thNight
14%8%37%5%36%5%6%7%31%
2716
16th to endNight
12%9%45%5%35%45%7%35%
2738
February1st to 15thNight
13%11%47%5%345%5%5%33%
2466
16th to endNight
14%6%36%6%36%5%6%8%33%
1896
March1st to 15thNight
16%7%34435%45%7%37%
2064
16th to endNight
15%7%26%425%447%39%
2043
April1st to 15thNight
15%7%35%5%35%5%5%7%34%
1796
16th to endNight
16%5%24424446%44%
1800
May1st to 15thNight
17%8%25%42445%7%37%
1545
16th to endNight
12%7%35%6%2445%7%39%
1495
June1st to 15thNight
16%6%244335%5%8%39%
1440
16th to endNight
10%424325%5%6%11%43%
1440
July1st to 15thNight
11%6%245%25%6%6%8%41%
1440
16th to endNight
9%332435%5%7%10%43%
1543
August1st to 15thNight
11%5%15%33446%8%43%
1626
16th to endNight
11%5%25%33345%7%46%
1910
September1st to 15thNight
14%5%24423345%47%
1800
16th to endNight
13%5%25%423446%48%
1950
October1st to 15thNight
16%5%245%23336%43%
2160
16th to endNight
17%6%24424446%40%
2337
November1st to 15thNight
13%6%35%5%345%5%6%41%
2472
16th to endNight
15%6%35%6%345%5%6%35%
2673
December1st to 15thNight
18%7%48%7%46%45%5%27%
2730
16th to endNight
14%9%47%6%36%45%8%29%
2912

Percentage Cloud Cover SE (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 15thDay
12%8%46%7%46%446%32%
1552
16th to endDay
12%10%47%7%45%45%7%29%
1836
February1st to 15thDay
15%8%48%7%35%46%6%30%
1695
16th to endDay
14%10%37%6%35%45%5%32%
1575
March1st to 15thDay
15%7%46%5%35%6%5%6%32%
1881
16th to endDay
17%9%36%5%34336%36%
2179
April1st to 15thDay
16%8%36%42435%5%36%
2152
16th to endDay
15%5%35%6%3345%6%40%
2160
May1st to 15thDay
21%7%25%5%35%445%33%
2418
16th to endDay
17%6%25%6%35%5%5%7%33%
2618
June1st to 15thDay
16%6%35%6%36%5%6%9%31%
2520
16th to endDay
13%6%25%6%45%5%6%8%34%
2520
July1st to 15thDay
12%5%36%6%36%6%6%8%34%
2520
16th to endDay
11%5%35%6%46%6%6%8%35%
2624
August1st to 15thDay
15%6%26%7%36%6%6%8%31%
2320
16th to endDay
15%5%245%3445%7%40%
2292
September1st to 15thDay
16%425%435%45%6%39%
2160
16th to endDay
16%5%25%334347%43%
2008
October1st to 15thDay
18%6%34434447%39%
1800
16th to endDay
18%6%35%4345%5%5%37%
1887
November1st to 15thDay
15%7%35%433345%41%
1716
16th to endDay
19%6%2432345%6%40%
1615
December1st to 15thDay
16%10%36%5%36%45%7%30%
1560
16th to endDay
15%11%5%6%436%5%5%6%28%
1664
January1st to 15thNight
15%7%25%6%45%5%5%8%33%
2716
16th to endNight
13%9%35%5%34447%37%
2738
February1st to 15thNight
13%10%46%5%3445%6%34%
2459
16th to endNight
14%6%35%5%25%5%5%8%37%
1896
March1st to 15thNight
17%6%34325%45%7%38%
2076
16th to endNight
15%6%245%2445%7%40%
2043
April1st to 15thNight
15%9%35%6%35%45%6%35%
1796
16th to endNight
17%5%24324445%44%
1800
May1st to 15thNight
17%8%24434347%38%
1545
16th to endNight
13%6%35%5%3446%7%40%
1495
June1st to 15thNight
17%424435%45%7%40%
1440
16th to endNight
10%42433447%10%44%
1440
July1st to 15thNight
11%5%245%246%5%9%41%
1440
16th to endNight
10%323435%5%7%10%44%
1543
August1st to 15thNight
11%5%14425%46%8%44%
1626
16th to endNight
12%42443345%7%47%
1910
September1st to 15thNight
14%5%24433435%47%
1800
16th to endNight
13%5%24423346%48%
1950
October1st to 15thNight
17%6%24423336%44%
2160
16th to endNight
17%5%14434447%42%
2337
November1st to 15thNight
14%5%35%4335%5%6%42%
2472
16th to endNight
16%5%25%5%35%45%7%36%
2673
December1st to 15thNight
19%6%36%6%46%5%5%6%28%
2730
16th to endNight
15%9%36%5%36%46%7%32%
2912

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 15thDay
50%7%12%18%7%2
1553
16th to endDay
52%7%13%17%9%
1836
February1st to 15thDay
53%7%12%16%8%1
1697
16th to endDay
51%6%13%20%7%1
1575
March1st to 15thDay
48%8%15%16%9%1
1881
16th to endDay
49%5%10%19%13%1
2180
April1st to 15thDay
47%6%9%20%12%2
2152
16th to endDay
42%6%9%20%17%3
2160
May1st to 15thDay
51%6%10%18%12%1
2418
16th to endDay
48%8%12%16%12%1
2622
June1st to 15thDay
47%8%14%19%9%
2520
16th to endDay
44%7%14%22%9%1
2520
July1st to 15thDay
46%7%13%19%12%
2371
16th to endDay
42%8%13%22%11%1
2459
August1st to 15thDay
47%8%14%17%12%
2307
16th to endDay
41%6%11%22%17%1
2292
September1st to 15thDay
42%6%11%18%18%1
2160
16th to endDay
40%49%22%22%2
2008
October1st to 15thDay
44%6%12%20%14%1
1800
16th to endDay
45%7%12%22%11%1
1887
November1st to 15thDay
45%413%19%12%3
1716
16th to endDay
43%413%24%12%
1615
December1st to 15thDay
51%7%17%15%7%
1560
16th to endDay
53%8%14%14%8%
1664
January1st to 15thNight
47%7%15%17%10%2
2716
16th to endNight
45%5%15%22%10%
2738
February1st to 15thNight
48%7%14%18%8%1
2468
16th to endNight
43%7%13%21%12%2
1896
March1st to 15thNight
44%7%15%21%10%1
2076
16th to endNight
42%6%13%20%14%2
2043
April1st to 15thNight
47%6%11%19%13%1
1796
16th to endNight
39%6%10%20%20%2
1800
May1st to 15thNight
44%7%11%20%14%1
1545
16th to endNight
43%8%15%15%14%2
1497
June1st to 15thNight
42%7%12%24%13%
1440
16th to endNight
33%8%16%28%12%
1440
July1st to 15thNight
39%9%12%23%13%1
1360
16th to endNight
32%10%18%21%14%1
1445
August1st to 15thNight
36%7%14%24%15%1
1615
16th to endNight
35%7%11%22%20%1
1910
September1st to 15thNight
38%6%11%24%17%1
1800
16th to endNight
36%48%24%23%2
1950
October1st to 15thNight
41%5%13%23%14%1
2160
16th to endNight
40%6%13%26%12%
2337
November1st to 15thNight
40%7%13%20%13%3
2472
16th to endNight
45%6%13%21%12%1
2673
December1st to 15thNight
52%8%14%16%7%
2730
16th to endNight
51%6%15%18%7%
2912

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 15thDay
36%27%23%8%21
90
16th to endDay
22%28%36%11%
136
February1st to 15thDay
32%43%21%3
130
16th to endDay
22%30%32%11%2
234
March1st to 15thDay
22%28%29%15%3
270
16th to endDay
24%29%23%14%6%1
288
April1st to 15thDay
24%23%25%15%8%1
270
16th to endDay
20%15%35%14%10%5%
270
May1st to 15thDay
32%20%22%12%8%3
288
16th to endDay
21%13%26%21%12%3
331
June1st to 15thDay
20%15%24%25%12%2
315
16th to endDay
17%15%32%22%10%2
315
July1st to 15thDay
15%8%28%25%15%5%
305
16th to endDay
12%427%33%15%5%
326
August1st to 15thDay
15%7%22%26%21%6%
313
16th to endDay
15%422%26%18%12%
332
September1st to 15thDay
16%13%23%18%19%9%
315
16th to endDay
18%7%19%21%18%13%
314
October1st to 15thDay
23%7%20%27%14%6%
315
16th to endDay
21%19%31%18%8%
328
November1st to 15thDay
20%20%25%22%9%1
280
16th to endDay
25%26%28%15%3
145
December1st to 15thDay
36%24%23%6%7%1
90
16th to endDay
34%30%31%4
96
January1st to 15thNight
22%25%32%16%2
780
16th to endNight
21%25%34%17%1
832
February1st to 15thNight
24%26%33%14%
760
16th to endNight
24%26%32%13%2
631
March1st to 15thNight
25%24%30%16%3
720
16th to endNight
20%25%32%15%5%
768
April1st to 15thNight
22%21%33%18%3
718
16th to endNight
21%17%29%22%8%
720
May1st to 15thNight
23%12%27%26%9%
465
16th to endNight
17%6%26%34%13%
375
June1st to 15thNight
19%7%22%33%16%
360
16th to endNight
11%427%44%11%
360
July1st to 15thNight
15%422%39%17%
340
16th to endNight
12%121%40%20%2
405
August1st to 15thNight
15%216%40%22%2
545
16th to endNight
14%416%34%28%2
764
September1st to 15thNight
16%6%24%29%21%2
720
16th to endNight
16%6%20%28%22%5%
717
October1st to 15thNight
23%9%22%26%15%2
720
16th to endNight
22%17%29%22%6%
768
November1st to 15thNight
18%17%31%20%10%1
760
16th to endNight
21%21%29%20%6%
780
December1st to 15thNight
26%21%29%17%5%
780
16th to endNight
23%27%30%15%2
832
Page generated at 2018-02-15 10:58:45. Version ac04

Copyright 2018 A. Danko


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