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 2017-03-19.

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%
14482
17%
45242
8%
14448
39%
14448
19%
30065

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%
720
14%
2506
6%
716
28%
716
11%
1710
January16th to endNight
14%
768
17%
2528
3%
768
31%
768
14%
1683
February1st to 15thNight
11%
704
14%
2287
2%
701
25%
701
11%
1574
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%
720
19%
1917
6%
720
30%
720
19%
1299
April1st to 15thNight
18%
658
15%
1646
4%
658
25%
658
18%
1194
April16th to endNight
28%
660
17%
1650
5%
660
34%
660
26%
1107
May1st to 15thNight
33%
427
19%
1417
10%
427
43%
427
19%
940
May16th to endNight
42%
342
14%
1369
12%
342
50%
342
17%
860
June1st to 15thNight
40%
330
15%
1320
14%
330
50%
330
17%
851
June16th to endNight
55%
330
14%
1320
15%
330
61%
330
26%
751
July1st to 15thNight
49%
310
14%
1240
17%
310
52%
310
20%
779
July16th to endNight
59%
374
13%
1330
12%
350
64%
350
25%
768
August1st to 15thNight
56%
499
18%
1479
13%
496
59%
496
30%
925
August16th to endNight
56%
700
18%
1750
9%
700
58%
700
31%
1154
September1st to 15thNight
46%
660
23%
1650
11%
660
52%
660
31%
1106
September16th to endNight
48%
657
24%
1787
17%
657
53%
657
31%
1146
October1st to 15thNight
40%
660
20%
1980
14%
660
48%
660
24%
1273
October16th to endNight
26%
704
19%
2142
8%
704
39%
704
20%
1403
November1st to 15thNight
28%
700
18%
2277
9%
700
40%
700
19%
1460
November16th to endNight
22%
720
16%
2467
7%
720
34%
720
15%
1644
December1st to 15thNight
16%
720
11%
2520
4%
720
25%
720
10%
1825
December16th to endNight
14%
768
13%
2688
2%
768
29%
768
10%
1913

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%
45582
Night
14%7%35%5%35%45%7%38%
45415
Cloud CoverDay
15%7%36%5%35%5%5%7%35%
45592
Night
15%6%25%5%3445%7%39%
45420
TransparencyDay
47%7%12%19%12%1
45273
Night
43%7%13%21%13%1
45242
SeeingDay
20%15%25%20%12%4
4945
Night
20%16%28%23%9%
14483

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%9%47%8%35%5%6%7%29%
1432
16th to endDay
11%10%5%8%8%35%5%5%6%28%
1695
February1st to 15thDay
15%8%49%6%4446%6%28%
1575
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
16%9%46%6%34346%35%
2037
April1st to 15thDay
18%8%46%5%25%445%35%
1972
16th to endDay
13%6%26%5%3345%7%40%
1980
May1st to 15thDay
20%6%25%6%35%45%5%34%
2215
16th to endDay
15%7%46%5%35%5%6%6%34%
2394
June1st to 15thDay
16%6%346%26%5%6%9%30%
2310
16th to endDay
13%6%26%6%36%5%5%8%34%
2310
July1st to 15thDay
12%6%26%6%36%6%5%8%34%
2310
16th to endDay
10%5%25%6%36%6%7%9%35%
2431
August1st to 15thDay
14%7%25%6%45%6%7%8%32%
2127
16th to endDay
15%7%3443445%7%39%
2100
September1st to 15thDay
15%425%5%245%5%7%40%
1980
16th to endDay
16%6%25%433446%43%
1841
October1st to 15thDay
16%6%245%3445%8%38%
1650
16th to endDay
18%8%35%425%446%34%
1730
November1st to 15thDay
14%9%36%5%23336%40%
1581
16th to endDay
20%6%25%425%35%6%36%
1491
December1st to 15thDay
17%9%48%5%35%46%6%29%
1440
16th to endDay
15%11%49%5%45%6%5%5%27%
1536
January1st to 15thNight
14%8%37%5%36%5%6%7%30%
2506
16th to endNight
12%9%45%5%35%5%5%7%34%
2528
February1st to 15thNight
13%10%46%5%345%5%5%34%
2285
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%6%25%5%25%447%39%
1917
April1st to 15thNight
15%7%46%6%35%5%46%34%
1646
16th to endNight
17%5%24424446%44%
1650
May1st to 15thNight
16%7%25%42445%7%39%
1417
16th to endNight
12%6%25%5%2445%7%40%
1367
June1st to 15thNight
17%6%244345%5%8%37%
1320
16th to endNight
9%424325%5%6%11%43%
1320
July1st to 15thNight
11%6%235%26%6%5%8%41%
1320
16th to endNight
8%332435%5%7%10%44%
1428
August1st to 15thNight
11%5%15%33446%9%44%
1490
16th to endNight
12%5%25%43345%7%45%
1750
September1st to 15thNight
14%5%24423445%47%
1650
16th to endNight
14%6%25%423345%47%
1787
October1st to 15thNight
17%5%24423336%44%
1980
16th to endNight
17%6%24424447%39%
2142
November1st to 15thNight
13%6%35%5%3445%6%41%
2277
16th to endNight
16%6%36%6%35%5%5%6%34%
2467
December1st to 15thNight
19%6%48%7%45%5%5%5%27%
2520
16th to endNight
15%9%47%6%36%5%48%28%
2688

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%45%6%31%
1432
16th to endDay
12%9%5%7%7%45%45%7%29%
1695
February1st to 15thDay
14%8%48%7%35%46%6%30%
1575
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%8%36%5%34336%36%
2036
April1st to 15thDay
17%8%36%42435%6%36%
1972
16th to endDay
14%5%25%5%3445%6%41%
1980
May1st to 15thDay
20%7%25%5%35%445%34%
2215
16th to endDay
16%6%25%6%25%5%5%7%34%
2394
June1st to 15thDay
17%6%346%36%5%6%9%30%
2310
16th to endDay
13%6%26%6%46%5%6%8%34%
2310
July1st to 15thDay
12%5%36%6%36%6%6%8%34%
2310
16th to endDay
11%5%35%6%36%6%6%8%36%
2431
August1st to 15thDay
15%6%25%7%36%6%6%8%32%
2127
16th to endDay
16%6%345%3445%7%39%
2100
September1st to 15thDay
16%425%435%46%7%40%
1980
16th to endDay
17%5%25%334346%42%
1841
October1st to 15thDay
17%5%34434447%39%
1650
16th to endDay
19%6%35%5%345%5%5%36%
1730
November1st to 15thDay
15%7%35%433345%41%
1581
16th to endDay
20%6%3432445%5%38%
1491
December1st to 15thDay
16%9%37%5%36%5%5%6%30%
1440
16th to endDay
16%11%5%6%436%5%5%6%27%
1536
January1st to 15thNight
15%8%35%6%45%5%5%7%32%
2506
16th to endNight
12%9%35%5%3445%7%37%
2528
February1st to 15thNight
12%9%47%5%3445%6%35%
2278
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%24425%35%7%40%
1917
April1st to 15thNight
15%9%35%6%35%45%6%34%
1646
16th to endNight
17%5%24324445%45%
1650
May1st to 15thNight
17%7%24434347%39%
1417
16th to endNight
13%5%345%3446%7%41%
1367
June1st to 15thNight
18%424435%45%7%39%
1320
16th to endNight
10%4243345%8%9%44%
1320
July1st to 15thNight
12%5%245%25%6%5%8%42%
1320
16th to endNight
9%323435%5%7%10%44%
1428
August1st to 15thNight
11%5%15%425%46%8%45%
1490
16th to endNight
12%4245%3345%7%46%
1750
September1st to 15thNight
14%5%24433335%48%
1650
16th to endNight
14%5%24423345%47%
1787
October1st to 15thNight
17%6%24423336%44%
1980
16th to endNight
18%5%14434447%40%
2142
November1st to 15thNight
13%6%35%4335%5%7%42%
2277
16th to endNight
17%6%25%6%35%45%7%35%
2467
December1st to 15thNight
19%6%36%7%46%5%5%6%28%
2520
16th to endNight
16%9%36%5%36%46%7%31%
2688

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
51%7%12%18%7%2
1433
16th to endDay
52%7%12%17%9%
1695
February1st to 15thDay
52%7%12%16%8%1
1577
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%14%1
2037
April1st to 15thDay
48%6%9%20%12%2
1972
16th to endDay
40%5%9%20%18%4
1980
May1st to 15thDay
50%6%10%18%12%1
2215
16th to endDay
47%8%12%16%13%1
2398
June1st to 15thDay
48%8%15%19%8%
2310
16th to endDay
44%8%14%22%9%
2310
July1st to 15thDay
46%7%13%19%12%
2161
16th to endDay
41%8%14%22%12%1
2266
August1st to 15thDay
46%7%14%17%13%
2114
16th to endDay
42%5%10%22%17%1
2100
September1st to 15thDay
41%6%11%18%19%1
1980
16th to endDay
42%38%21%21%2
1841
October1st to 15thDay
43%6%13%21%13%1
1650
16th to endDay
46%7%12%21%10%1
1730
November1st to 15thDay
45%414%19%13%3
1581
16th to endDay
46%413%23%11%1
1491
December1st to 15thDay
51%7%17%14%6%
1440
16th to endDay
53%8%14%15%8%
1536
January1st to 15thNight
48%7%16%17%9%2
2506
16th to endNight
45%6%14%22%10%
2528
February1st to 15thNight
47%7%14%19%9%1
2287
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%14%21%14%1
1917
April1st to 15thNight
48%5%11%18%13%2
1646
16th to endNight
39%5%9%20%21%2
1650
May1st to 15thNight
43%7%11%21%14%1
1417
16th to endNight
41%8%15%15%15%3
1369
June1st to 15thNight
43%8%12%23%11%
1320
16th to endNight
32%8%16%29%11%
1320
July1st to 15thNight
40%9%11%23%13%1
1240
16th to endNight
31%11%18%21%14%2
1330
August1st to 15thNight
35%7%15%24%15%1
1479
16th to endNight
36%7%12%21%20%2
1750
September1st to 15thNight
38%6%11%24%18%1
1650
16th to endNight
38%48%24%22%2
1787
October1st to 15thNight
40%5%13%23%14%1
1980
16th to endNight
41%6%13%25%12%
2142
November1st to 15thNight
40%7%14%20%13%4
2277
16th to endNight
46%5%13%20%11%1
2467
December1st to 15thNight
52%8%14%16%7%
2520
16th to endNight
51%6%16%17%7%
2688

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
38%28%21%8%11
60
16th to endDay
21%31%29%15%1
91
February1st to 15thDay
28%42%24%4
90
16th to endDay
22%30%32%11%2
234
March1st to 15thDay
22%28%29%15%3
270
16th to endDay
22%30%21%15%7%2
238
April1st to 15thDay
26%20%25%15%10%1
210
16th to endDay
16%15%33%16%10%6%
210
May1st to 15thDay
32%15%22%14%10%4
228
16th to endDay
17%13%26%23%14%4
267
June1st to 15thDay
21%14%24%24%13%2
255
16th to endDay
16%10%33%23%12%2
255
July1st to 15thDay
14%8%25%25%18%6%
245
16th to endDay
12%228%35%15%5%
270
August1st to 15thDay
14%5%20%30%23%5%
253
16th to endDay
16%418%26%19%15%
268
September1st to 15thDay
15%9%22%19%21%11%
255
16th to endDay
22%6%22%19%17%12%
254
October1st to 15thDay
21%9%19%30%14%5%
255
16th to endDay
20%19%33%18%7%
267
November1st to 15thDay
19%20%24%22%10%2
235
16th to endDay
25%21%30%18%3
111
December1st to 15thDay
40%25%16%6%10%1
60
16th to endDay
37%26%31%4
64
January1st to 15thNight
22%25%31%17%2
720
16th to endNight
21%26%33%17%1
768
February1st to 15thNight
24%25%34%14%
704
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%
720
April1st to 15thNight
22%21%33%18%3
658
16th to endNight
21%17%29%22%8%
660
May1st to 15thNight
22%11%27%27%9%
427
16th to endNight
16%5%26%35%14%
343
June1st to 15thNight
20%7%23%32%15%
330
16th to endNight
10%424%46%13%
330
July1st to 15thNight
15%423%38%18%
310
16th to endNight
12%221%42%19%2
374
August1st to 15thNight
14%216%42%21%1
499
16th to endNight
14%416%33%28%2
700
September1st to 15thNight
16%6%22%29%22%2
660
16th to endNight
17%6%21%28%21%4
657
October1st to 15thNight
23%9%22%27%14%2
660
16th to endNight
22%17%30%23%5%
704
November1st to 15thNight
17%17%32%21%10%1
700
16th to endNight
21%20%30%19%6%
720
December1st to 15thNight
26%21%29%17%4
720
16th to endNight
23%27%30%15%2
768
Page generated at 2017-03-20 08:18:34. Version ac04

Copyright 2017 A. Danko


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