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 2005-11-05 to 2017-09-21.

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
72%
15770
36%
46900
29%
15725
78%
15725
56%
21867

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
57%
716
30%
2431
25%
716
68%
716
42%
1192
January16th to endNight
52%
768
34%
2460
25%
768
65%
768
38%
1277
February1st to 15thNight
59%
700
36%
2102
29%
696
70%
696
48%
1051
February16th to endNight
56%
632
30%
1895
27%
632
63%
632
41%
1034
March1st to 15thNight
61%
720
28%
2139
23%
720
71%
720
49%
1054
March16th to endNight
65%
768
32%
1998
21%
768
73%
768
53%
1066
April1st to 15thNight
62%
719
32%
1799
17%
719
68%
719
52%
983
April16th to endNight
67%
720
34%
1800
15%
720
74%
720
62%
916
May1st to 15thNight
72%
666
31%
1746
19%
666
76%
666
61%
869
May16th to endNight
73%
555
33%
1679
23%
555
78%
555
60%
747
June1st to 15thNight
88%
360
35%
1440
39%
360
91%
360
59%
515
June16th to endNight
95%
360
42%
1440
51%
360
97%
360
78%
433
July1st to 15thNight
94%
340
36%
1360
42%
340
94%
340
67%
452
July16th to endNight
93%
593
38%
1618
31%
556
93%
556
72%
675
August1st to 15thNight
94%
717
38%
1790
25%
713
94%
713
80%
803
August16th to endNight
95%
764
46%
1910
31%
764
95%
764
83%
850
September1st to 15thNight
92%
720
43%
1800
33%
720
92%
720
77%
832
September16th to endNight
88%
680
48%
1872
44%
680
92%
680
81%
770
October1st to 15thNight
75%
660
37%
1890
35%
660
80%
660
60%
880
October16th to endNight
74%
704
43%
2112
41%
704
82%
704
60%
947
November1st to 15thNight
69%
700
37%
2258
34%
700
79%
700
59%
969
November16th to endNight
66%
720
37%
2340
34%
720
75%
720
54%
1043
December1st to 15thNight
61%
720
35%
2340
29%
720
71%
720
43%
1158
December16th to endNight
54%
768
31%
2681
25%
768
66%
768
37%
1351

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
4212212235%72%
47945
Night
4212212235%72%
47099
TransparencyDay
17%37%17%29%25%
47633
Night
16%26%16%29%27%
46911
SeeingDay
6%8%29%37%13%4
5993
Night
5%215%33%33%9%
15781

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
7%313312246%61%
1507
16th to endDay
12%413222335%58%
1761
February1st to 15thDay
8%413213346%60%
1751
16th to endDay
12%5%23313345%54%
1579
March1st to 15thDay
6%313324447%59%
1818
16th to endDay
5%32321335%7%60%
2224
April1st to 15thDay
7%323212237%63%
2149
16th to endDay
42211125%6%71%
2160
May1st to 15thDay
4211112236%71%
2202
16th to endDay
321211236%74%
2432
June1st to 15thDay
221112235%76%
2520
16th to endDay
1111288%
2520
July1st to 15thDay
111122382%
2520
16th to endDay
221222480%
2435
August1st to 15thDay
1111111286%
2160
16th to endDay
1121385%
2292
September1st to 15thDay
111122484%
2160
16th to endDay
111112384%
1879
October1st to 15thDay
4212212335%71%
1737
16th to endDay
12231223375%
1760
November1st to 15thDay
42221323473%
1600
16th to endDay
3213313337%65%
1620
December1st to 15thDay
6%412313448%58%
1620
16th to endDay
11%412312347%56%
1539
January1st to 15thNight
7%313313246%60%
2431
16th to endNight
9%41321333461%
2460
February1st to 15thNight
6%313212346%62%
2101
16th to endNight
12%313323335%58%
1895
March1st to 15thNight
4212322427%64%
2139
16th to endNight
3213212449%64%
1998
April1st to 15thNight
7%212113235%68%
1799
16th to endNight
21112246%74%
1800
May1st to 15thNight
111221233475%
1746
16th to endNight
21121123380%
1678
June1st to 15thNight
11111125%81%
1440
16th to endNight
11191%
1440
July1st to 15thNight
1111123382%
1440
16th to endNight
1111213481%
1729
August1st to 15thNight
1111288%
1800
16th to endNight
11111287%
1910
September1st to 15thNight
111111286%
1800
16th to endNight
11122286%
1872
October1st to 15thNight
321211223474%
1890
16th to endNight
221111223476%
2112
November1st to 15thNight
321221223474%
2258
16th to endNight
422213335%69%
2340
December1st to 15thNight
7%313313347%61%
2340
16th to endNight
9%312222347%60%
2681

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
24%27%16%25%22%
1507
16th to endDay
30%17%15%19%24%
1761
February1st to 15thDay
25%16%18%27%20%
1751
16th to endDay
31%29%18%28%9%
1579
March1st to 15thDay
24%411%21%22%16%
1818
16th to endDay
23%312%24%24%11%
2224
April1st to 15thDay
24%49%25%25%10%
2149
16th to endDay
16%410%23%31%13%
2160
May1st to 15thDay
17%49%20%30%16%
2202
16th to endDay
15%49%26%34%10%
2435
June1st to 15thDay
13%410%15%31%23%
2520
16th to endDay
6%237%36%43%
2520
July1st to 15thDay
9%36%9%25%46%
2371
16th to endDay
12%36%19%28%30%
2283
August1st to 15thDay
8%3210%34%41%
2146
16th to endDay
6%249%39%37%
2292
September1st to 15thDay
6%26%12%31%40%
2160
16th to endDay
7%1313%34%38%
1879
October1st to 15thDay
18%2418%27%27%
1737
16th to endDay
17%3413%27%33%
1760
November1st to 15thDay
16%16%14%34%26%
1600
16th to endDay
20%37%16%23%28%
1620
December1st to 15thDay
24%49%16%25%19%
1620
16th to endDay
29%38%20%19%17%
1539
January1st to 15thNight
25%26%17%24%23%
2431
16th to endNight
27%37%12%20%28%
2460
February1st to 15thNight
22%26%20%25%23%
2112
16th to endNight
30%17%18%28%13%
1895
March1st to 15thNight
20%310%20%24%20%
2139
16th to endNight
19%411%23%25%15%
1998
April1st to 15thNight
20%410%25%26%12%
1799
16th to endNight
13%48%24%33%16%
1800
May1st to 15thNight
15%38%23%31%17%
1747
16th to endNight
12%48%23%38%12%
1679
June1st to 15thNight
10%39%17%35%24%
1440
16th to endNight
42310%30%48%
1440
July1st to 15thNight
8%2411%24%49%
1360
16th to endNight
9%27%18%28%34%
1618
August1st to 15thNight
5%328%32%46%
1790
16th to endNight
6%118%43%39%
1910
September1st to 15thNight
8%247%31%46%
1800
16th to endNight
6%1211%40%38%
1872
October1st to 15thNight
15%2415%32%29%
1890
16th to endNight
13%3213%29%36%
2112
November1st to 15thNight
15%25%14%31%30%
2258
16th to endNight
17%27%17%24%31%
2340
December1st to 15thNight
23%49%15%25%22%
2340
16th to endNight
25%49%17%23%18%
2681

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
14%11%44%23%5%
135
16th to endDay
17%14%39%23%31
261
February1st to 15thDay
12%15%33%30%5%2
266
16th to endDay
19%15%31%26%6%
238
March1st to 15thDay
9%15%35%25%13%
270
16th to endDay
8%12%41%26%9%1
288
April1st to 15thDay
14%14%41%20%6%3
269
16th to endDay
5%18%43%24%6%1
270
May1st to 15thDay
9%13%35%28%9%3
288
16th to endDay
7%11%30%37%9%3
330
June1st to 15thDay
38%29%38%13%5%
315
16th to endDay
1126%42%18%9%
315
July1st to 15thDay
115%47%24%10%
305
16th to endDay
2110%50%25%9%
327
August1st to 15thDay
1117%53%16%9%
315
16th to endDay
1115%54%18%8%
332
September1st to 15thDay
2228%47%15%4
315
16th to endDay
1427%50%13%2
276
October1st to 15thDay
5%12%35%33%11%1
255
16th to endDay
49%36%37%11%
272
November1st to 15thDay
45%22%36%26%3
106
16th to endDay
7%10%36%33%11%1
90
December1st to 15thDay
48%21%43%21%1
90
16th to endDay
9%21%33%24%9%1
65
January1st to 15thNight
9%323%38%18%7%
720
16th to endNight
11%6%23%35%17%5%
768
February1st to 15thNight
7%423%36%21%6%
704
16th to endNight
14%221%36%19%5%
632
March1st to 15thNight
5%324%37%24%4
720
16th to endNight
5%321%38%26%4
768
April1st to 15thNight
7%322%38%22%5%
719
16th to endNight
3322%37%26%6%
720
May1st to 15thNight
2119%36%32%6%
667
16th to endNight
2216%35%35%6%
557
June1st to 15thNight
27%34%48%7%
360
16th to endNight
239%48%8%
360
July1st to 15thNight
2117%65%14%
340
16th to endNight
213%60%23%
593
August1st to 15thNight
121%62%13%
717
16th to endNight
1114%62%20%
764
September1st to 15thNight
1324%52%17%
720
16th to endNight
7%31%44%15%
680
October1st to 15thNight
3114%37%34%8%
660
16th to endNight
3115%34%32%11%
704
November1st to 15thNight
3120%37%26%10%
700
16th to endNight
6%220%37%24%9%
720
December1st to 15thNight
7%320%39%23%5%
720
16th to endNight
12%5%24%35%16%5%
768
Page generated at 2017-09-22 04:35:37. Version ac04

Copyright 2017 A. Danko


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