Coyote Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Coyote Lake clear sky chart from 2005-11-05 to 2018-03-21.

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
68%
16176
27%
49235
25%
16140
71%
16140
38%
27395

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
65%
776
20%
2592
21%
776
67%
776
31%
1487
January16th to endNight
61%
832
24%
2704
25%
832
64%
832
30%
1611
February1st to 15thNight
63%
757
28%
2456
29%
757
68%
757
31%
1420
February16th to endNight
57%
684
25%
2051
22%
684
63%
684
32%
1242
March1st to 15thNight
58%
780
19%
2197
18%
780
60%
780
29%
1417
March16th to endNight
55%
792
20%
2139
16%
792
59%
792
31%
1378
April1st to 15thNight
55%
719
24%
1799
15%
719
58%
719
35%
1144
April16th to endNight
58%
720
26%
1800
12%
720
63%
720
46%
1031
May1st to 15thNight
70%
659
23%
1739
15%
659
72%
659
43%
999
May16th to endNight
68%
379
25%
1501
26%
379
73%
379
33%
747
June1st to 15thNight
71%
360
25%
1440
27%
360
78%
360
36%
688
June16th to endNight
86%
360
32%
1440
42%
360
88%
360
45%
603
July1st to 15thNight
89%
368
27%
1388
33%
368
89%
368
44%
614
July16th to endNight
82%
564
28%
1593
25%
531
84%
531
39%
856
August1st to 15thNight
78%
586
27%
1659
21%
583
78%
583
38%
951
August16th to endNight
86%
764
33%
1910
21%
764
86%
764
52%
1072
September1st to 15thNight
85%
720
37%
1800
27%
720
86%
720
60%
949
September16th to endNight
81%
716
41%
1947
38%
716
83%
716
56%
982
October1st to 15thNight
74%
720
30%
2160
32%
720
78%
720
49%
1093
October16th to endNight
75%
768
36%
2304
39%
768
77%
768
45%
1202
November1st to 15thNight
71%
760
29%
2387
29%
760
74%
760
42%
1239
November16th to endNight
68%
780
27%
2587
28%
780
72%
780
36%
1386
December1st to 15thNight
61%
780
24%
2730
24%
780
66%
780
30%
1568
December16th to endNight
54%
832
22%
2912
21%
832
59%
832
26%
1716

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
7%313323346%59%
49607
Night
8%423324447%54%
49423
TransparencyDay
26%38%19%24%17%
49293
Night
30%39%18%22%16%
49236
SeeingDay
9%7%20%33%21%7%
6606
Night
10%310%32%33%9%
16189

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 15thDay
14%6%14433346%45%
1672
16th to endDay
15%6%34333446%44%
1872
February1st to 15thDay
15%6%3442325%6%46%
1737
16th to endDay
17%6%26%424446%39%
1709
March1st to 15thDay
13%7%345%36%5%5%8%35%
2090
16th to endDay
13%5%35%425%5%5%7%41%
2212
April1st to 15thDay
13%7%35%43335%7%43%
2149
16th to endDay
8%313323336%59%
2160
May1st to 15thDay
3322313447%64%
2208
16th to endDay
4424324446%58%
2607
June1st to 15thDay
3323313446%63%
2520
16th to endDay
111112236%77%
2520
July1st to 15thDay
12112235%76%
2487
16th to endDay
11112335%77%
2468
August1st to 15thDay
111213236%73%
2290
16th to endDay
1122346%77%
2292
September1st to 15thDay
1111112235%78%
2160
16th to endDay
222112346%72%
2008
October1st to 15thDay
4213213446%65%
1800
16th to endDay
6%213324345%62%
1920
November1st to 15thDay
9%313324447%53%
1802
16th to endDay
12%5%2432335%6%51%
1700
December1st to 15thDay
15%6%25%433435%46%
1560
16th to endDay
16%5%34423446%42%
1664
January1st to 15thNight
12%42342446%7%46%
2592
16th to endNight
15%5%24423346%48%
2704
February1st to 15thNight
14%5%14324447%48%
2445
16th to endNight
14%6%24323347%47%
2051
March1st to 15thNight
13%6%35%425%447%42%
2197
16th to endNight
13%5%3443335%7%45%
2139
April1st to 15thNight
11%5%23425%5%47%47%
1799
16th to endNight
5%42231435%8%58%
1800
May1st to 15thNight
2314325%6%5%8%56%
1739
16th to endNight
2434315%45%8%56%
1501
June1st to 15thNight
2323425%35%7%59%
1440
16th to endNight
213214446%68%
1440
July1st to 15thNight
111236%45%9%62%
1470
16th to endNight
113436%6%6%9%54%
1701
August1st to 15thNight
325%5%26%5%6%8%53%
1668
16th to endNight
11242446%8%63%
1910
September1st to 15thNight
1212213347%68%
1800
16th to endNight
2213213336%70%
1947
October1st to 15thNight
45%13212247%63%
2160
16th to endNight
5%313324336%62%
2304
November1st to 15thNight
7%413213348%57%
2387
16th to endNight
9%423323447%53%
2587
December1st to 15thNight
14%6%23423347%48%
2730
16th to endNight
18%5%14323345%46%
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
38%411%20%16%8%
1672
16th to endDay
40%49%15%19%11%
1872
February1st to 15thDay
38%28%22%20%8%
1737
16th to endDay
45%38%23%16%3
1709
March1st to 15thDay
42%5%12%19%15%4
2090
16th to endDay
40%5%14%19%16%3
2212
April1st to 15thDay
39%411%21%19%3
2149
16th to endDay
27%312%24%23%8%
2160
May1st to 15thDay
21%29%29%28%8%
2208
16th to endDay
28%310%27%22%7%
2611
June1st to 15thDay
22%310%22%24%14%
2520
16th to endDay
12%2417%35%27%
2520
July1st to 15thDay
14%237%24%48%
2340
16th to endDay
11%249%28%43%
2313
August1st to 15thDay
17%3211%28%37%
2274
16th to endDay
12%2212%34%34%
2292
September1st to 15thDay
12%2314%33%34%
2160
16th to endDay
15%3225%34%18%
2008
October1st to 15thDay
19%27%21%25%24%
1800
16th to endDay
24%38%21%24%18%
1920
November1st to 15thDay
29%310%24%23%7%
1802
16th to endDay
32%310%20%27%5%
1700
December1st to 15thDay
40%210%16%18%10%
1560
16th to endDay
41%312%16%18%5%
1664
January1st to 15thNight
34%413%21%17%8%
2592
16th to endNight
37%411%15%16%14%
2704
February1st to 15thNight
36%28%22%21%8%
2456
16th to endNight
36%312%26%15%4
2051
March1st to 15thNight
41%313%19%15%7%
2197
16th to endNight
38%412%20%16%7%
2139
April1st to 15thNight
34%412%25%18%3
1799
16th to endNight
24%412%27%21%9%
1800
May1st to 15thNight
27%48%20%27%11%
1740
16th to endNight
27%411%23%25%6%
1501
June1st to 15thNight
25%410%18%21%19%
1440
16th to endNight
20%2212%30%31%
1440
July1st to 15thNight
21%335%21%44%
1388
16th to endNight
27%45%7%18%35%
1593
August1st to 15thNight
32%228%22%31%
1659
16th to endNight
22%338%30%31%
1910
September1st to 15thNight
18%248%29%36%
1800
16th to endNight
19%1218%35%21%
1947
October1st to 15thNight
22%26%22%20%25%
2160
16th to endNight
25%25%21%23%20%
2304
November1st to 15thNight
25%311%23%25%9%
2387
16th to endNight
29%310%22%24%8%
2587
December1st to 15thNight
35%39%18%19%12%
2730
16th to endNight
38%313%18%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
21%6%20%30%16%3
210
16th to endDay
19%7%18%27%22%5%
304
February1st to 15thDay
15%8%20%28%21%6%
288
16th to endDay
16%15%23%25%17%2
290
March1st to 15thDay
18%14%21%26%14%4
330
16th to endDay
17%13%30%25%11%1
311
April1st to 15thDay
19%15%29%22%10%1
269
16th to endDay
11%18%32%24%11%2
270
May1st to 15thDay
9%13%33%29%11%2
288
16th to endDay
6%12%24%34%16%5%
330
June1st to 15thDay
6%9%32%33%12%5%
315
16th to endDay
1119%43%25%8%
315
July1st to 15thDay
114%42%28%10%
305
16th to endDay
9%47%27%13%
327
August1st to 15thDay
4113%41%30%8%
315
16th to endDay
12%40%31%14%
332
September1st to 15thDay
1214%40%28%12%
315
16th to endDay
5%5%15%34%29%9%
315
October1st to 15thDay
47%26%33%22%5%
315
16th to endDay
9%420%30%27%8%
336
November1st to 15thDay
9%6%14%28%26%14%
218
16th to endDay
9%5%18%37%26%1
122
December1st to 15thDay
16%6%14%28%25%7%
90
16th to endDay
10%12%431%31%10%
96
January1st to 15thNight
14%19%35%29%10%
780
16th to endNight
17%37%32%27%10%
832
February1st to 15thNight
16%310%32%28%9%
764
16th to endNight
18%413%36%21%5%
684
March1st to 15thNight
16%410%31%29%6%
780
16th to endNight
15%6%14%36%23%4
792
April1st to 15thNight
13%7%15%36%22%4
719
16th to endNight
8%5%20%33%24%7%
720
May1st to 15thNight
4115%40%29%7%
660
16th to endNight
6%411%35%35%7%
380
June1st to 15thNight
3214%39%36%3
360
16th to endNight
11440%46%4
360
July1st to 15thNight
2324%56%12%
368
16th to endNight
116%20%50%19%
564
August1st to 15thNight
218%26%49%10%
586
16th to endNight
16%26%51%13%
764
September1st to 15thNight
25%28%48%13%
720
16th to endNight
418%29%41%13%
716
October1st to 15thNight
7%39%34%31%14%
720
16th to endNight
7%19%28%32%20%
768
November1st to 15thNight
10%110%34%32%11%
760
16th to endNight
11%29%34%30%11%
780
December1st to 15thNight
17%39%33%27%8%
780
16th to endNight
20%412%31%25%5%
832
Page generated at 2018-03-22 08:34:20. Version ac04

Copyright 2018 A. Danko


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