Camp Crooked Creek
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Camp Crooked Creek clear sky chart from 2005-11-05 to 2018-10-27.

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
43%
17033
20%
51121
15%
16989
50%
16989
25%
33140

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
23%
975
15%
2716
7%
970
31%
970
18%
2001
January16th to endNight
21%
841
18%
2688
9%
841
32%
841
18%
1837
February1st to 15thNight
20%
764
14%
2292
4%
761
29%
761
16%
1663
February16th to endNight
19%
683
15%
2049
6%
683
27%
683
16%
1478
March1st to 15thNight
23%
780
16%
2304
9%
780
30%
780
19%
1607
March16th to endNight
31%
813
15%
2269
8%
813
37%
813
19%
1623
April1st to 15thNight
35%
584
22%
1947
14%
584
47%
584
25%
1188
April16th to endNight
37%
579
20%
1824
13%
579
45%
579
23%
1197
May1st to 15thNight
43%
584
17%
1754
11%
584
48%
584
22%
1195
May16th to endNight
61%
609
19%
1828
15%
609
64%
609
28%
1171
June1st to 15thNight
66%
585
21%
1667
17%
585
69%
585
38%
977
June16th to endNight
71%
585
21%
1560
16%
585
73%
585
40%
933
July1st to 15thNight
65%
555
18%
1480
15%
555
66%
555
34%
930
July16th to endNight
73%
612
21%
1707
18%
579
76%
579
38%
981
August1st to 15thNight
77%
575
24%
1735
23%
572
79%
572
39%
985
August16th to endNight
76%
621
22%
2070
24%
621
77%
621
35%
1129
September1st to 15thNight
65%
685
24%
2050
22%
685
68%
685
31%
1260
September16th to endNight
61%
777
29%
2145
23%
777
63%
777
36%
1299
October1st to 15thNight
56%
780
32%
2145
26%
780
62%
780
38%
1241
October16th to endNight
41%
816
27%
2568
21%
816
50%
816
29%
1557
November1st to 15thNight
43%
760
27%
2471
22%
760
52%
760
30%
1452
November16th to endNight
36%
780
25%
2535
19%
780
45%
780
23%
1595
December1st to 15thNight
30%
780
14%
2535
9%
780
37%
780
17%
1784
December16th to endNight
21%
910
16%
2782
8%
910
31%
910
15%
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
14%6%35%5%3445%7%39%
52423
Night
14%7%35%42445%6%41%
51308
TransparencyDay
43%6%11%22%14%2
52113
Night
42%5%10%22%16%3
51122
SeeingDay
16%8%22%22%19%10%
7121
Night
17%7%24%28%19%2
17036

By Month

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
22%8%38%5%23346%30%
1552
16th to endDay
15%9%47%5%3345%5%35%
1882
February1st to 15thDay
18%10%5%8%5%23335%33%
1900
16th to endDay
17%10%47%5%2445%6%31%
1710
March1st to 15thDay
21%9%35%423345%36%
1986
16th to endDay
17%8%37%5%35%45%7%30%
2317
April1st to 15thDay
15%6%25%5%34445%41%
2331
16th to endDay
15%7%25%5%3445%6%39%
2411
May1st to 15thDay
18%6%25%435%45%7%34%
2526
16th to endDay
10%6%36%5%45%5%7%9%35%
2639
June1st to 15thDay
8%3245%36%6%6%7%44%
2619
16th to endDay
6%3245%46%6%6%10%42%
2730
July1st to 15thDay
11%5%25%5%35%5%6%9%37%
2730
16th to endDay
7%425%436%6%8%10%39%
2703
August1st to 15thDay
7%5%25%5%45%5%7%9%41%
2464
16th to endDay
7%5%25%6%35%5%6%9%42%
2484
September1st to 15thDay
15%5%345%345%5%7%39%
2226
16th to endDay
14%5%2442335%7%46%
2145
October1st to 15thDay
13%42342335%7%49%
2145
16th to endDay
16%5%2441333448%
1909
November1st to 15thDay
13%5%34423346%47%
1717
16th to endDay
17%8%25%313345%44%
1755
December1st to 15thDay
22%9%36%5%23435%33%
1755
16th to endDay
20%12%45%423337%31%
1787
January1st to 15thNight
17%10%5%8%6%3434431%
2716
16th to endNight
17%10%36%424345%36%
2688
February1st to 15thNight
21%10%46%5%23445%31%
2283
16th to endNight
18%10%46%5%25%445%31%
2049
March1st to 15thNight
18%8%35%6%2444436%
2304
16th to endNight
17%9%35%5%24445%34%
2269
April1st to 15thNight
15%6%24413447%44%
1947
16th to endNight
14%7%35%5%23445%41%
1824
May1st to 15thNight
14%6%35%5%34447%38%
1754
16th to endNight
7%4246%46%6%8%8%41%
1826
June1st to 15thNight
5%4234245%5%9%50%
1667
16th to endNight
5%323435%5%7%12%46%
1560
July1st to 15thNight
9%5%1443445%9%45%
1560
16th to endNight
6%3234245%7%10%49%
1814
August1st to 15thNight
5%3134245%6%10%52%
1746
16th to endNight
43144245%7%10%49%
2070
September1st to 15thNight
11%42442446%7%46%
2050
16th to endNight
10%425%423445%51%
2145
October1st to 15thNight
10%424423338%53%
2145
16th to endNight
16%5%24423345%48%
2568
November1st to 15thNight
14%5%24323346%49%
2471
16th to endNight
17%7%34423335%43%
2535
December1st to 15thNight
21%9%45%5%34345%33%
2535
16th to endNight
22%11%46%424335%30%
2782

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
54%38%19%11%
1553
16th to endDay
49%310%26%8%1
1882
February1st to 15thDay
53%38%24%8%1
1902
16th to endDay
52%412%19%9%1
1710
March1st to 15thDay
49%410%18%14%1
1986
16th to endDay
52%5%10%23%7%
2318
April1st to 15thDay
43%5%9%22%16%1
2331
16th to endDay
45%49%21%14%3
2411
May1st to 15thDay
48%6%12%20%12%
2526
16th to endDay
43%9%13%20%12%1
2643
June1st to 15thDay
36%7%11%24%17%2
2619
16th to endDay
34%9%12%21%18%3
2730
July1st to 15thDay
41%7%13%19%13%4
2581
16th to endDay
34%11%15%23%12%2
2547
August1st to 15thDay
35%9%13%22%16%2
2451
16th to endDay
36%7%12%22%16%3
2484
September1st to 15thDay
42%6%11%18%16%4
2226
16th to endDay
38%49%22%22%2
2145
October1st to 15thDay
34%48%27%21%3
2145
16th to endDay
39%37%26%20%2
1909
November1st to 15thDay
38%47%24%19%6%
1717
16th to endDay
42%26%26%20%1
1755
December1st to 15thDay
53%311%19%9%2
1755
16th to endDay
54%312%21%7%
1787
January1st to 15thNight
55%37%17%14%1
2716
16th to endNight
50%310%23%10%1
2688
February1st to 15thNight
54%410%19%9%1
2292
16th to endNight
54%411%18%10%1
2049
March1st to 15thNight
49%48%19%14%2
2304
16th to endNight
50%5%11%21%10%1
2269
April1st to 15thNight
39%5%10%21%19%3
1947
16th to endNight
44%47%22%15%5%
1824
May1st to 15thNight
46%6%9%25%10%1
1755
16th to endNight
36%9%13%21%15%3
1828
June1st to 15thNight
29%6%14%26%18%4
1667
16th to endNight
28%7%16%23%18%5%
1560
July1st to 15thNight
34%6%14%23%16%4
1480
16th to endNight
25%9%16%26%18%2
1707
August1st to 15thNight
25%8%16%24%20%4
1735
16th to endNight
27%7%15%25%20%3
2070
September1st to 15thNight
35%6%10%22%19%5%
2050
16th to endNight
33%48%22%25%5%
2145
October1st to 15thNight
30%49%24%26%4
2145
16th to endNight
38%36%25%22%4
2568
November1st to 15thNight
36%37%23%22%6%
2471
16th to endNight
42%37%23%20%1
2535
December1st to 15thNight
53%410%19%11%1
2535
16th to endNight
56%49%18%9%1
2782

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
30%18%29%14%5%1
135
16th to endDay
19%28%38%11%2
144
February1st to 15thDay
26%25%36%10%1
135
16th to endDay
29%15%42%10%2
120
March1st to 15thDay
23%22%36%15%2
171
16th to endDay
26%15%33%16%6%1
352
April1st to 15thDay
20%16%27%23%9%1
330
16th to endDay
19%10%28%22%12%6%
319
May1st to 15thDay
21%10%26%22%11%7%
348
16th to endDay
16%5%20%27%16%13%
395
June1st to 15thDay
8%116%33%28%11%
459
16th to endDay
7%5%26%25%22%11%
570
July1st to 15thDay
14%115%26%23%17%
550
16th to endDay
9%112%26%28%21%
419
August1st to 15thDay
12%110%19%34%22%
358
16th to endDay
12%211%25%31%17%
396
September1st to 15thDay
17%212%18%32%16%
375
16th to endDay
18%214%17%30%16%
374
October1st to 15thDay
16%323%27%21%8%
375
16th to endDay
19%11%29%20%17%2
247
November1st to 15thDay
18%9%30%25%9%5%
135
16th to endDay
22%11%30%25%6%2
135
December1st to 15thDay
15%20%37%15%8%1
135
16th to endDay
34%22%33%6%3
144
January1st to 15thNight
22%15%32%24%5%
975
16th to endNight
24%15%35%23%2
841
February1st to 15thNight
28%11%34%23%2
764
16th to endNight
25%13%37%21%2
683
March1st to 15thNight
23%13%34%24%4
780
16th to endNight
22%11%28%28%8%
813
April1st to 15thNight
18%11%31%27%11%
584
16th to endNight
18%8%30%28%13%1
579
May1st to 15thNight
18%5%25%30%18%1
585
16th to endNight
9%315%35%27%7%
611
June1st to 15thNight
7%118%36%32%3
585
16th to endNight
6%113%41%32%4
585
July1st to 15thNight
12%111%28%40%5%
555
16th to endNight
7%19%31%41%9%
612
August1st to 15thNight
6%6%32%45%8%
575
16th to endNight
6%7%32%47%4
621
September1st to 15thNight
13%210%28%38%7%
685
16th to endNight
12%315%26%35%5%
777
October1st to 15thNight
14%317%29%29%4
780
16th to endNight
19%5%29%28%15%1
816
November1st to 15thNight
15%8%29%26%19%1
760
16th to endNight
20%12%26%28%11%
780
December1st to 15thNight
25%11%26%26%9%1
780
16th to endNight
29%10%31%23%3
910
Page generated at 2018-10-28 08:41:05. Version ac04

Copyright 2018 A. Danko


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