Condon Peak Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Condon Peak Campground clear sky chart from 2005-11-05 to

2017-09-12
.

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
73%
15499
31%
46848
28%
15463
76%
15463
47%
23536

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
64%
716
22%
2410
22%
716
68%
716
34%
1323
January16th to endNight
62%
768
25%
2496
27%
768
64%
768
31%
1460
February1st to 15thNight
62%
700
26%
2210
26%
700
66%
700
31%
1292
February16th to endNight
59%
632
25%
1895
24%
632
65%
632
32%
1142
March1st to 15thNight
63%
720
20%
2067
19%
720
66%
720
34%
1249
March16th to endNight
60%
768
24%
2046
17%
768
65%
768
38%
1208
April1st to 15thNight
54%
719
27%
1799
14%
719
59%
719
37%
1098
April16th to endNight
64%
720
30%
1800
13%
720
70%
720
55%
940
May1st to 15thNight
72%
701
30%
1781
18%
701
75%
701
62%
874
May16th to endNight
75%
388
37%
1511
35%
388
82%
388
59%
537
June1st to 15thNight
78%
360
33%
1440
37%
360
85%
360
57%
524
June16th to endNight
91%
360
41%
1440
49%
360
96%
360
83%
409
July1st to 15thNight
96%
346
36%
1366
45%
346
96%
346
81%
407
July16th to endNight
92%
564
39%
1593
35%
531
92%
531
73%
648
August1st to 15thNight
94%
639
40%
1713
29%
636
94%
636
83%
712
August16th to endNight
95%
764
45%
1910
30%
764
95%
764
84%
846
September1st to 15thNight
92%
706
44%
1765
33%
706
93%
706
79%
803
September16th to endNight
89%
656
47%
1764
43%
656
92%
656
80%
746
October1st to 15thNight
77%
660
32%
1980
35%
660
80%
660
48%
989
October16th to endNight
77%
704
38%
2112
39%
704
82%
704
54%
994
November1st to 15thNight
74%
700
33%
2223
35%
700
78%
700
48%
1066
November16th to endNight
69%
720
27%
2340
27%
720
73%
720
39%
1217
December1st to 15thNight
62%
720
25%
2499
25%
720
67%
720
28%
1469
December16th to endNight
54%
768
24%
2688
23%
768
60%
768
25%
1583

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
5%413313335%64%
47813
Night
4313313345%64%
47033
TransparencyDay
21%36%17%27%22%
47497
Night
21%48%17%26%21%
46849
SeeingDay
9%8%19%33%23%6%
5959
Night
7%410%28%36%13%
15509

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
8%6%25%424447%50%
1525
16th to endDay
13%7%35%423345%47%
1728
February1st to 15thDay
12%7%23323335%49%
1652
16th to endDay
13%9%36%424445%40%
1579
March1st to 15thDay
8%6%26%5%35%6%5%9%40%
1892
16th to endDay
8%6%35%5%345%46%45%
2177
April1st to 15thDay
9%8%24423446%48%
2149
16th to endDay
6%423323346%59%
2160
May1st to 15thDay
3212313337%66%
2168
16th to endDay
4313313345%65%
2599
June1st to 15thDay
2312213245%70%
2520
16th to endDay
11111387%
2520
July1st to 15thDay
1111112483%
2511
16th to endDay
11111122480%
2468
August1st to 15thDay
111111386%
2235
16th to endDay
1111288%
2292
September1st to 15thDay
111112385%
2114
16th to endDay
11111223478%
1864
October1st to 15thDay
4312313446%64%
1650
16th to endDay
3213313445%66%
1760
November1st to 15thDay
6%415%323335%59%
1634
16th to endDay
6%435%42335%7%55%
1620
December1st to 15thDay
9%6%35%5%3446%6%43%
1460
16th to endDay
10%9%35%42445%6%42%
1536
January1st to 15thNight
7%6%24333447%51%
2410
16th to endNight
10%6%24424446%49%
2496
February1st to 15thNight
7%6%345%3445%8%47%
2199
16th to endNight
8%5%25%425%45%7%48%
1895
March1st to 15thNight
6%425%4345%5%6%50%
2067
16th to endNight
5%42442445%7%53%
2046
April1st to 15thNight
6%414425%446%54%
1799
16th to endNight
311222335%7%67%
1800
May1st to 15thNight
1112212236%72%
1781
16th to endNight
11121123477%
1510
June1st to 15thNight
11221222476%
1440
16th to endNight
1291%
1440
July1st to 15thNight
111288%
1446
16th to endNight
1111222282%
1701
August1st to 15thNight
11111188%
1722
16th to endNight
111111287%
1910
September1st to 15thNight
1121111286%
1765
16th to endNight
111122385%
1764
October1st to 15thNight
3313323345%65%
1980
16th to endNight
2212213446%67%
2112
November1st to 15thNight
3213322347%64%
2223
16th to endNight
5%41442446%8%55%
2340
December1st to 15thNight
7%6%46%3245%47%47%
2499
16th to endNight
11%5%35%424447%46%
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
33%49%19%21%11%
1525
16th to endDay
39%47%15%19%14%
1728
February1st to 15thDay
37%37%22%21%8%
1652
16th to endDay
42%6%8%19%19%3
1579
March1st to 15thDay
36%6%11%19%16%8%
1892
16th to endDay
37%6%11%21%17%5%
2177
April1st to 15thDay
36%48%23%20%6%
2149
16th to endDay
24%49%26%26%8%
2160
May1st to 15thDay
17%37%22%37%11%
2168
16th to endDay
19%38%27%31%9%
2603
June1st to 15thDay
15%36%18%31%24%
2520
16th to endDay
5%210%34%45%
2520
July1st to 15thDay
6%125%25%58%
2362
16th to endDay
9%238%24%51%
2313
August1st to 15thDay
6%110%32%48%
2219
16th to endDay
5%110%39%42%
2292
September1st to 15thDay
6%1313%33%41%
2114
16th to endDay
9%2318%41%24%
1864
October1st to 15thDay
19%37%20%27%21%
1650
16th to endDay
19%46%20%28%21%
1760
November1st to 15thDay
27%49%18%28%11%
1634
16th to endDay
29%47%20%29%9%
1620
December1st to 15thDay
39%6%7%15%20%10%
1460
16th to endDay
40%5%11%18%16%8%
1536
January1st to 15thNight
31%410%22%21%10%
2410
16th to endNight
34%411%12%22%14%
2496
February1st to 15thNight
34%5%8%20%23%7%
2210
16th to endNight
33%5%11%23%20%5%
1895
March1st to 15thNight
31%7%14%17%19%9%
2067
16th to endNight
27%7%14%21%19%8%
2046
April1st to 15thNight
29%6%10%25%21%5%
1799
16th to endNight
15%5%14%27%26%11%
1800
May1st to 15thNight
13%38%22%37%14%
1782
16th to endNight
10%28%29%37%11%
1511
June1st to 15thNight
12%28%17%30%29%
1440
16th to endNight
319%32%51%
1440
July1st to 15thNight
43424%61%
1366
16th to endNight
8%236%23%56%
1593
August1st to 15thNight
5%17%29%54%
1713
16th to endNight
6%17%35%49%
1910
September1st to 15thNight
8%129%26%51%
1765
16th to endNight
6%1215%41%32%
1764
October1st to 15thNight
20%36%20%28%20%
1980
16th to endNight
17%37%17%33%21%
2112
November1st to 15thNight
20%311%19%30%14%
2223
16th to endNight
25%5%11%16%27%13%
2340
December1st to 15thNight
35%6%9%16%21%11%
2499
16th to endNight
35%6%13%17%17%10%
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
22%10%28%20%16%
153
16th to endDay
21%9%23%26%15%3
256
February1st to 15thDay
20%10%20%24%19%4
249
16th to endDay
23%15%18%26%15%2
238
March1st to 15thDay
12%14%23%29%17%2
270
16th to endDay
13%15%31%27%11%1
288
April1st to 15thDay
19%20%24%23%9%2
269
16th to endDay
10%21%29%28%9%1
270
May1st to 15thDay
8%11%28%35%12%3
288
16th to endDay
7%12%23%31%17%6%
330
June1st to 15thDay
5%8%24%35%18%6%
315
16th to endDay
1217%40%27%10%
315
July1st to 15thDay
29%43%30%13%
305
16th to endDay
17%39%38%12%
327
August1st to 15thDay
38%46%32%8%
315
16th to endDay
15%34%42%16%
332
September1st to 15thDay
1112%37%37%11%
300
16th to endDay
3414%35%39%3
255
October1st to 15thDay
5%8%22%40%20%1
255
16th to endDay
7%6%26%31%25%2
272
November1st to 15thDay
8%9%8%19%47%7%
140
16th to endDay
8%20%17%34%17%1
90
December1st to 15thDay
15%17%22%28%15%
63
16th to endDay
18%15%20%26%15%3
64
January1st to 15thNight
12%310%31%27%13%
720
16th to endNight
15%310%31%26%12%
768
February1st to 15thNight
13%5%10%33%26%10%
704
16th to endNight
13%7%14%34%22%7%
632
March1st to 15thNight
9%6%14%32%28%9%
720
16th to endNight
9%7%16%30%30%6%
768
April1st to 15thNight
8%11%19%30%23%6%
719
16th to endNight
49%17%28%29%10%
720
May1st to 15thNight
25%15%35%31%10%
702
16th to endNight
25%12%31%40%7%
389
June1st to 15thNight
2211%36%40%6%
360
16th to endNight
6%30%50%11%
360
July1st to 15thNight
21%61%15%
346
16th to endNight
111%53%31%
564
August1st to 15thNight
118%58%19%
639
16th to endNight
1115%61%20%
764
September1st to 15thNight
1219%54%21%
706
16th to endNight
16%25%44%21%
656
October1st to 15thNight
6%36%30%35%17%
660
16th to endNight
5%29%27%35%20%
704
November1st to 15thNight
5%410%31%33%15%
700
16th to endNight
7%312%29%31%14%
720
December1st to 15thNight
13%411%34%28%8%
720
16th to endNight
15%10%13%30%23%5%
768
Page generated at 2017-09-13 04:39:22. Version ac04

Copyright 2017 A. Danko


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