Rose Valley Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Rose Valley Campground clear sky chart from 2005-11-06 to 2024-01-16.

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
69%
24245
36%
74615
28%
24190
77%
24190
52%
35449

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 10thNight
51%
756
29%
2621
23%
756
63%
756
35%
1336
January11th to 20thNight
55%
744
36%
2418
26%
744
70%
744
46%
1158
January21st to endNight
45%
792
37%
2520
23%
792
64%
792
39%
1297
February1st to 10thNight
52%
720
36%
2160
26%
720
66%
720
45%
1094
February11th to 20thNight
56%
700
36%
2098
28%
700
70%
700
49%
1030
February21st to endNight
50%
592
31%
1776
24%
592
62%
592
42%
930
March1st to 10thNight
51%
720
26%
2160
19%
720
63%
720
38%
1186
March11th to 20thNight
59%
720
28%
2040
22%
720
67%
720
44%
1098
March21st to endNight
57%
792
33%
2009
19%
792
67%
792
49%
1103
April1st to 10thNight
58%
720
33%
1800
17%
720
66%
720
50%
1008
April11th to 20thNight
59%
711
37%
1779
17%
711
69%
711
58%
918
April21st to endNight
63%
720
35%
1800
14%
720
71%
720
60%
928
May1st to 10thNight
64%
720
31%
1800
16%
720
70%
720
58%
944
May11th to 20thNight
72%
543
37%
1607
26%
543
77%
543
58%
733
May21st to endNight
69%
574
31%
1738
21%
574
76%
574
58%
789
June1st to 10thNight
82%
360
37%
1440
39%
360
88%
360
56%
537
June11th to 20thNight
88%
360
40%
1440
44%
360
92%
360
67%
477
June21st to endNight
91%
360
44%
1440
51%
360
95%
360
79%
428
July1st to 10thNight
94%
350
39%
1400
46%
350
95%
350
71%
446
July11th to 20thNight
95%
402
41%
1446
43%
402
95%
402
72%
504
July21st to endNight
93%
667
39%
1746
30%
630
93%
630
73%
760
August1st to 10thNight
91%
716
37%
1780
24%
712
91%
712
75%
832
August11th to 20thNight
95%
712
41%
1780
26%
712
95%
712
82%
794
August21st to endNight
95%
792
46%
1980
32%
792
95%
792
83%
874
September1st to 10thNight
91%
720
45%
1800
34%
720
92%
720
80%
817
September11th to 20thNight
89%
720
48%
1876
40%
720
92%
720
78%
821
September21st to endNight
85%
720
47%
1980
42%
720
91%
720
79%
826
October1st to 10thNight
79%
720
39%
2013
34%
720
85%
720
66%
911
October11th to 20thNight
75%
720
42%
2160
39%
720
83%
720
61%
956
October21st to endNight
70%
792
44%
2376
39%
792
80%
792
60%
1043
November1st to 10thNight
69%
740
38%
2377
36%
740
79%
740
57%
1023
November11th to 20thNight
67%
760
38%
2470
32%
760
79%
760
55%
1074
November21st to endNight
57%
760
36%
2470
31%
760
70%
760
47%
1180
December1st to 10thNight
56%
760
35%
2470
28%
760
67%
760
42%
1219
December11th to 20thNight
52%
760
28%
3108
26%
759
65%
759
25%
1859
December21st to endNight
51%
830
20%
4737
25%
817
65%
817
22%
2516

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%312223345%71%
74823
Night
5%312223345%71%
74999
TransparencyDay
17%47%16%29%27%
74543
Night
18%46%16%28%29%
74800
SeeingDay
6%10%27%36%16%4
14430
Night
5%418%35%31%7%
24261

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 10thDay
10%42442335%7%57%
1542
11th to 20thDay
8%313422246%64%
1669
21st to endDay
11%6%24322336%59%
1832
February1st to 10thDay
9%423313345%63%
1800
11th to 20thDay
8%41331335%8%61%
1750
21st to endDay
9%5%34323345%60%
1480
March1st to 10thDay
9%5%25%4345%47%52%
1800
11th to 20thDay
8%42432345%7%57%
1916
21st to endDay
6%31332435%7%61%
2345
April1st to 10thDay
7%32332335%8%62%
2160
11th to 20thDay
4323212347%69%
2129
21st to endDay
431211335%6%71%
2160
May1st to 10thDay
5%423222347%67%
2160
11th to 20thDay
2212222346%72%
2287
21st to endDay
4312322347%70%
2533
June1st to 10thDay
3212213336%73%
2520
11th to 20thDay
111121122383%
2520
21st to endDay
111111222486%
2520
July1st to 10thDay
11111123385%
2520
11th to 20thDay
211221223481%
2462
21st to endDay
2211213336%77%
2466
August1st to 10thDay
121121223383%
2149
11th to 20thDay
1111122388%
2122
21st to endDay
11121222485%
2376
September1st to 10thDay
111112225%84%
2160
11th to 20thDay
11111123486%
2084
21st to endDay
111111222384%
1980
October1st to 10thDay
3212212345%75%
1944
11th to 20thDay
311221222480%
1800
21st to endDay
1212312435%76%
1980
November1st to 10thDay
3212213235%75%
1700
11th to 20thDay
4312313346%70%
1710
21st to endDay
3324434447%63%
1710
December1st to 10thDay
6%5%14423447%59%
1710
11th to 20thDay
18%6%2342445%7%45%
2033
21st to endDay
11%6%25%5%345%5%7%48%
2794
January1st to 10thNight
10%41332435%7%57%
2621
11th to 20thNight
6%313324446%64%
2418
21st to endNight
9%5%2332333463%
2520
February1st to 10thNight
7%5%24312346%64%
2160
11th to 20thNight
7%222223346%66%
2098
21st to endNight
9%424322345%62%
1776
March1st to 10thNight
9%423424449%54%
2160
11th to 20thNight
5%4243235%5%7%61%
2040
21st to endNight
5%41332345%7%65%
2009
April1st to 10thNight
6%32332335%7%64%
1800
11th to 20thNight
4312212435%73%
1779
21st to endNight
3211113347%73%
1800
May1st to 10thNight
2322312345%72%
1800
11th to 20thNight
213212335%78%
1606
21st to endNight
1213212345%77%
1738
June1st to 10thNight
2111212325%78%
1440
11th to 20thNight
21111123386%
1440
21st to endNight
11112290%
1440
July1st to 10thNight
1121122385%
1440
11th to 20thNight
11111223483%
1494
21st to endNight
11221323481%
1849
August1st to 10thNight
121211222385%
1790
11th to 20thNight
11111222287%
1780
21st to endNight
11111222388%
1980
September1st to 10thNight
21111111289%
1800
11th to 20thNight
11111212287%
1876
21st to endNight
111111133286%
1980
October1st to 10thNight
3112212335%78%
2013
11th to 20thNight
2212112235%77%
2160
21st to endNight
231111223479%
2376
November1st to 10thNight
3212213346%74%
2377
11th to 20thNight
3312313335%72%
2470
21st to endNight
4413323446%66%
2470
December1st to 10thNight
8%31331335%6%62%
2470
11th to 20thNight
20%6%2332345%7%45%
3167
21st to endNight
11%4245%35%5%5%7%50%
4862

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 10thDay
27%47%17%27%18%
1542
11th to 20thDay
24%38%13%27%24%
1669
21st to endDay
30%27%17%22%23%
1832
February1st to 10thDay
25%25%15%26%27%
1800
11th to 20thDay
23%26%17%30%21%
1760
21st to endDay
27%38%17%27%17%
1480
March1st to 10thDay
32%5%9%18%19%18%
1800
11th to 20thDay
26%410%19%25%15%
1916
21st to endDay
24%6%11%24%25%11%
2345
April1st to 10thDay
23%6%11%24%24%12%
2160
11th to 20thDay
19%5%8%25%30%13%
2132
21st to endDay
16%5%10%24%35%11%
2160
May1st to 10thDay
19%7%10%19%31%14%
2160
11th to 20thDay
15%5%9%24%33%13%
2290
21st to endDay
15%8%9%27%33%8%
2533
June1st to 10thDay
15%6%9%19%32%18%
2520
11th to 20thDay
8%7%8%13%34%31%
2520
21st to endDay
7%348%35%43%
2520
July1st to 10thDay
7%35%8%26%52%
2451
11th to 20thDay
10%35%17%29%35%
2387
21st to endDay
11%47%19%31%28%
2329
August1st to 10thDay
10%438%32%43%
2135
11th to 20thDay
6%3211%34%44%
2122
21st to endDay
8%248%36%42%
2376
September1st to 10thDay
7%35%10%30%46%
2160
11th to 20thDay
5%45%12%32%43%
2084
21st to endDay
8%3312%39%34%
1980
October1st to 10thDay
14%36%17%24%37%
1944
11th to 20thDay
14%4411%30%37%
1800
21st to endDay
14%45%12%25%40%
1980
November1st to 10thDay
14%2417%33%29%
1700
11th to 20thDay
17%28%13%26%34%
1710
21st to endDay
21%46%14%24%31%
1710
December1st to 10thDay
25%47%14%26%24%
1710
11th to 20thDay
38%6%6%16%21%15%
2032
21st to endDay
34%6%8%22%19%11%
2794
January1st to 10thNight
28%45%16%29%19%
2621
11th to 20thNight
21%48%16%25%26%
2418
21st to endNight
26%36%12%25%27%
2520
February1st to 10thNight
24%26%15%24%29%
2160
11th to 20thNight
20%35%17%28%26%
2099
21st to endNight
26%38%16%26%21%
1776
March1st to 10thNight
29%48%19%23%18%
2160
11th to 20thNight
23%6%9%18%24%20%
2040
21st to endNight
21%410%23%28%14%
2009
April1st to 10thNight
21%6%10%26%23%15%
1800
11th to 20thNight
14%6%9%23%30%18%
1779
21st to endNight
14%6%7%24%39%11%
1800
May1st to 10thNight
16%5%9%22%32%16%
1800
11th to 20thNight
13%5%6%26%35%16%
1607
21st to endNight
11%7%9%26%36%10%
1738
June1st to 10thNight
11%5%9%23%33%19%
1440
11th to 20thNight
7%46%15%34%35%
1440
21st to endNight
42311%32%49%
1440
July1st to 10thNight
7%238%24%55%
1400
11th to 20thNight
7%25%18%30%37%
1446
21st to endNight
9%36%18%35%29%
1746
August1st to 10thNight
8%329%30%48%
1780
11th to 20thNight
6%238%36%46%
1780
21st to endNight
6%127%37%47%
1980
September1st to 10thNight
6%346%29%52%
1800
11th to 20thNight
7%229%37%43%
1876
21st to endNight
6%2311%39%40%
1980
October1st to 10thNight
13%2413%30%37%
2013
11th to 20thNight
12%4313%27%40%
2160
21st to endNight
12%439%27%44%
2376
November1st to 10thNight
14%3414%33%32%
2377
11th to 20thNight
16%27%13%25%37%
2470
21st to endNight
21%45%16%21%33%
2470
December1st to 10thNight
23%46%14%23%30%
2470
11th to 20thNight
38%47%12%21%17%
3167
21st to endNight
32%8%7%20%22%11%
4862

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 10thDay
16%17%33%23%9%1
203
11th to 20thDay
15%15%33%28%8%1
357
21st to endDay
12%19%37%22%8%2
396
February1st to 10thDay
11%15%36%28%7%3
420
11th to 20thDay
11%21%33%25%8%1
415
21st to endDay
15%19%36%24%6%1
346
March1st to 10thDay
16%20%35%21%7%
420
11th to 20thDay
14%18%33%26%8%1
420
21st to endDay
12%20%35%27%5%1
462
April1st to 10thDay
11%14%34%28%11%2
420
11th to 20thDay
7%22%33%29%7%2
412
21st to endDay
7%13%35%29%12%5%
420
May1st to 10thDay
10%14%31%32%10%3
423
11th to 20thDay
6%13%30%34%14%4
448
21st to endDay
7%12%32%31%14%4
485
June1st to 10thDay
48%25%37%20%6%
450
11th to 20thDay
15%22%45%20%7%
450
21st to endDay
25%22%43%21%8%
450
July1st to 10thDay
113%47%29%10%
446
11th to 20thDay
118%44%31%14%
444
21st to endDay
1111%46%29%13%
487
August1st to 10thDay
1116%50%21%11%
447
11th to 20thDay
1211%49%26%11%
437
21st to endDay
1114%51%24%8%
495
September1st to 10thDay
1222%46%21%7%
450
11th to 20thDay
15%27%47%17%3
450
21st to endDay
17%23%45%21%3
450
October1st to 10thDay
38%30%41%16%1
450
11th to 20thDay
37%35%36%16%2
450
21st to endDay
410%29%38%16%3
495
November1st to 10thDay
49%28%39%18%2
296
11th to 20thDay
5%11%31%34%17%3
270
21st to endDay
6%14%29%34%13%3
270
December1st to 10thDay
7%14%30%35%13%1
270
11th to 20thDay
9%14%28%31%14%4
228
21st to endDay
14%24%27%23%9%3
198
January1st to 10thNight
13%6%23%36%15%7%
760
11th to 20thNight
7%6%28%38%17%4
744
21st to endNight
11%8%30%33%14%4
792
February1st to 10thNight
9%8%25%33%19%5%
720
11th to 20thNight
9%5%27%35%18%6%
704
21st to endNight
11%6%27%37%15%3
592
March1st to 10thNight
10%5%28%36%19%2
720
11th to 20thNight
7%6%22%38%23%4
720
21st to endNight
7%7%24%40%19%3
792
April1st to 10thNight
7%326%38%22%4
720
11th to 20thNight
5%5%26%37%23%4
711
21st to endNight
45%26%36%23%7%
720
May1st to 10thNight
3324%37%28%4
720
11th to 20thNight
25%16%35%37%4
543
21st to endNight
2419%38%33%5%
576
June1st to 10thNight
2112%36%43%6%
360
11th to 20thNight
19%36%46%7%
360
21st to endNight
6%37%48%9%
360
July1st to 10thNight
1126%60%11%
350
11th to 20thNight
1115%64%18%
402
21st to endNight
2118%60%19%
667
August1st to 10thNight
11326%58%11%
716
11th to 20thNight
1120%62%15%
712
21st to endNight
2121%59%16%
792
September1st to 10thNight
21430%49%15%
720
11th to 20thNight
17%40%41%11%
720
21st to endNight
111%37%41%10%
720
October1st to 10thNight
3112%45%35%5%
720
11th to 20thNight
3217%41%29%8%
720
21st to endNight
35%18%35%29%10%
792
November1st to 10thNight
35%19%40%25%8%
740
11th to 20thNight
5%320%40%25%7%
760
21st to endNight
6%5%26%35%23%5%
760
December1st to 10thNight
9%7%22%37%22%4
760
11th to 20thNight
13%5%25%37%16%3
760
21st to endNight
11%6%27%36%14%6%
836
Page generated at 2024-01-13 16:28:28. Version ac07

Copyright 2024 Attilla Danko


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