Dogpound
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Dogpound clear sky chart from 2005-11-05 to 2018-02-13.

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
40%
15823
13%
48841
8%
15790
45%
15790
21%
33412

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
32%
975
11%
2910
6%
970
37%
970
16%
2139
January16th to endNight
33%
888
18%
2968
12%
888
42%
888
19%
1986
February1st to 15thNight
39%
747
12%
2600
10%
744
45%
744
17%
1781
February16th to endNight
37%
632
13%
1971
11%
632
43%
632
19%
1382
March1st to 15thNight
35%
720
12%
2127
7%
720
41%
720
20%
1528
March16th to endNight
36%
768
12%
2073
4%
767
41%
767
20%
1551
April1st to 15thNight
32%
632
10%
1712
4%
632
36%
632
18%
1289
April16th to endNight
36%
540
10%
1620
7%
540
39%
540
18%
1177
May1st to 15thNight
43%
400
10%
1396
9%
400
47%
400
20%
902
May16th to endNight
45%
374
4%
1309
2%
374
46%
374
16%
926
June1st to 15thNight
38%
360
0%
1260
0%
360
38%
360
13%
939
June16th to endNight
53%
360
0%
1260
0%
360
53%
360
19%
846
July1st to 15thNight
59%
340
1%
1190
0%
340
59%
340
24%
737
July16th to endNight
63%
376
9%
1279
8%
354
65%
354
28%
732
August1st to 15thNight
62%
384
9%
1456
11%
382
64%
382
22%
871
August16th to endNight
63%
573
18%
1719
16%
573
65%
573
37%
981
September1st to 15thNight
55%
670
16%
1809
11%
670
57%
670
34%
1134
September16th to endNight
53%
716
19%
1980
12%
716
58%
716
35%
1217
October1st to 15thNight
41%
720
15%
2129
9%
720
47%
720
22%
1472
October16th to endNight
40%
768
18%
2496
12%
768
49%
768
23%
1628
November1st to 15thNight
36%
890
17%
2607
9%
890
44%
890
23%
1789
November16th to endNight
30%
975
14%
2925
7%
975
38%
975
20%
2042
December1st to 15thNight
34%
975
13%
2925
9%
975
38%
975
18%
2117
December16th to endNight
34%
1040
15%
3120
8%
1040
40%
1040
18%
2246

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
11%9%47%6%35%5%6%7%32%
49234
Night
7%9%47%6%35%5%6%8%35%
48994
TransparencyDay
48%7%15%19%7%1
48888
Night
45%7%15%20%8%1
48844
SeeingDay
17%6%27%30%14%3
6396
Night
12%5%30%35%14%1
15829

By Month

Percentage Cloud Cover NW (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
5%12%5%8%5%45%45%8%34%
1358
16th to endDay
5%11%6%10%6%36%5%7%7%30%
1619
February1st to 15thDay
5%11%5%8%7%35%6%6%7%31%
1528
16th to endDay
5%11%7%9%6%46%6%6%8%27%
1500
March1st to 15thDay
311%5%8%7%46%5%6%7%31%
1833
16th to endDay
8%13%7%10%6%36%6%6%8%21%
2146
April1st to 15thDay
12%18%6%8%6%35%45%7%21%
2236
16th to endDay
14%13%47%5%35%45%7%27%
2340
May1st to 15thDay
13%9%47%6%35%5%7%7%30%
2553
16th to endDay
23%9%37%6%35%46%7%22%
2802
June1st to 15thDay
21%9%37%7%45%6%5%6%22%
2700
16th to endDay
16%6%37%6%36%5%6%8%28%
2700
July1st to 15thDay
14%5%26%6%36%46%7%35%
2700
16th to endDay
9%424435%5%7%8%42%
2801
August1st to 15thDay
14%5%24435%46%8%39%
2496
16th to endDay
10%5%15%4245%6%8%45%
2483
September1st to 15thDay
15%7%24423347%44%
2149
16th to endDay
11%6%25%4345%6%7%42%
1980
October1st to 15thDay
14%10%47%6%245%6%8%30%
1828
16th to endDay
9%9%46%5%36%46%8%35%
1728
November1st to 15thDay
6%11%5%8%6%45%6%5%7%33%
1568
16th to endDay
413%5%7%6%3336%8%37%
1365
December1st to 15thDay
411%5%10%7%46%6%6%6%29%
1365
16th to endDay
411%49%8%446%6%8%31%
1456
January1st to 15thNight
411%6%9%7%46%5%6%8%27%
2910
16th to endNight
411%48%6%35%6%6%8%33%
2968
February1st to 15thNight
6%10%49%7%45%5%5%7%33%
2589
16th to endNight
311%5%10%8%36%5%5%7%32%
1971
March1st to 15thNight
311%47%7%5%6%6%8%9%29%
2127
16th to endNight
5%12%5%8%6%46%7%6%8%29%
2073
April1st to 15thNight
10%14%5%7%6%35%5%5%7%28%
1712
16th to endNight
11%12%37%6%36%5%6%7%28%
1620
May1st to 15thNight
12%9%46%4345%5%7%36%
1395
16th to endNight
21%7%245%35%5%6%8%29%
1309
June1st to 15thNight
20%9%46%5%35%45%6%27%
1260
16th to endNight
13%5%35%6%36%5%6%8%33%
1260
July1st to 15thNight
9%4146%35%5%7%10%41%
1260
16th to endNight
7%42432435%8%51%
1366
August1st to 15thNight
12%5%25%335%47%9%41%
1464
16th to endNight
8%42332345%8%51%
1719
September1st to 15thNight
14%5%1441335%7%47%
1809
16th to endNight
11%5%243335%6%8%47%
1980
October1st to 15thNight
11%9%36%6%35%5%5%6%35%
2129
16th to endNight
8%8%26%5%35%5%5%9%38%
2496
November1st to 15thNight
411%36%6%36%5%7%7%37%
2607
16th to endNight
49%6%8%7%45%5%6%7%33%
2925
December1st to 15thNight
410%6%10%7%46%45%8%30%
2925
16th to endNight
311%5%9%9%45%6%6%6%29%
3120

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
48%6%14%22%5%2
1358
16th to endDay
49%7%12%16%10%3
1619
February1st to 15thDay
48%6%15%18%6%2
1528
16th to endDay
51%8%15%18%6%
1500
March1st to 15thDay
49%9%16%17%6%
1833
16th to endDay
58%7%14%15%4
2147
April1st to 15thDay
61%5%13%12%6%
2236
16th to endDay
54%6%13%16%6%1
2340
May1st to 15thDay
49%7%15%19%8%
2553
16th to endDay
57%8%14%14%5%
2807
June1st to 15thDay
58%8%13%14%41
2700
16th to endDay
50%9%15%19%4
2700
July1st to 15thDay
45%8%18%20%5%
2541
16th to endDay
35%10%19%24%8%
2625
August1st to 15thDay
40%9%21%22%5%
2479
16th to endDay
33%8%20%27%8%1
2483
September1st to 15thDay
40%5%14%22%14%2
2149
16th to endDay
38%7%13%26%11%2
1980
October1st to 15thDay
49%7%15%20%7%
1828
16th to endDay
44%6%15%23%8%
1728
November1st to 15thDay
49%8%14%19%7%1
1568
16th to endDay
44%5%18%20%8%2
1365
December1st to 15thDay
52%7%14%15%9%1
1365
16th to endDay
47%6%16%17%10%1
1456
January1st to 15thNight
51%8%14%16%6%2
2910
16th to endNight
45%6%13%18%11%3
2968
February1st to 15thNight
48%7%13%19%9%1
2600
16th to endNight
49%6%12%17%12%1
1971
March1st to 15thNight
46%9%17%19%5%
2127
16th to endNight
50%8%15%18%6%
2076
April1st to 15thNight
53%7%14%16%8%
1712
16th to endNight
51%7%14%20%5%1
1620
May1st to 15thNight
45%5%16%22%9%
1396
16th to endNight
50%7%18%16%5%1
1309
June1st to 15thNight
55%8%13%14%6%
1260
16th to endNight
44%9%18%20%5%
1260
July1st to 15thNight
37%8%22%23%7%
1190
16th to endNight
30%9%19%29%10%
1279
August1st to 15thNight
37%9%21%25%6%
1456
16th to endNight
28%6%20%28%12%2
1719
September1st to 15thNight
34%6%16%23%15%3
1809
16th to endNight
32%6%19%24%12%4
1980
October1st to 15thNight
46%6%14%21%9%1
2129
16th to endNight
40%8%17%23%8%
2496
November1st to 15thNight
43%7%14%22%11%1
2607
16th to endNight
47%7%17%17%7%3
2925
December1st to 15thNight
51%6%14%20%5%1
2925
16th to endNight
51%6%12%20%8%1
3120

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
10%221%33%21%12%
90
16th to endDay
4427%38%18%7%
96
February1st to 15thDay
13%11%24%33%11%6%
90
16th to endDay
14%324%43%12%1
159
March1st to 15thDay
9%13%43%27%5%
270
16th to endDay
15%12%38%24%7%2
288
April1st to 15thDay
23%14%26%27%8%
269
16th to endDay
24%10%27%27%9%1
270
May1st to 15thDay
15%11%27%24%18%3
372
16th to endDay
27%6%14%30%17%4
517
June1st to 15thDay
22%7%23%30%12%3
495
16th to endDay
17%327%29%16%4
495
July1st to 15thDay
17%219%32%22%4
475
16th to endDay
9%429%32%18%4
470
August1st to 15thDay
17%424%29%17%6%
315
16th to endDay
12%5%29%34%12%5%
332
September1st to 15thDay
22%327%29%11%4
315
16th to endDay
14%8%28%30%14%3
315
October1st to 15thDay
23%8%27%27%10%3
210
16th to endDay
14%6%31%29%15%2
144
November1st to 15thDay
17%6%30%34%6%4
133
16th to endDay
11%6%36%23%12%10%
90
December1st to 15thDay
3240%26%21%6%
90
16th to endDay
10%5%30%32%19%2
96
January1st to 15thNight
12%9%33%32%10%1
975
16th to endNight
9%8%37%33%10%1
888
February1st to 15thNight
11%6%29%34%14%3
752
16th to endNight
7%435%32%17%3
632
March1st to 15thNight
8%5%39%36%8%1
720
16th to endNight
12%5%32%37%11%
768
April1st to 15thNight
16%7%29%31%13%1
632
16th to endNight
18%5%27%36%12%
540
May1st to 15thNight
17%6%24%36%14%
400
16th to endNight
22%218%35%19%1
375
June1st to 15thNight
22%5%21%33%14%3
360
16th to endNight
15%219%39%21%1
360
July1st to 15thNight
12%215%41%26%2
340
16th to endNight
7%319%43%23%1
376
August1st to 15thNight
16%28%36%30%4
384
16th to endNight
8%217%43%26%1
573
September1st to 15thNight
19%116%33%24%3
670
16th to endNight
12%325%37%18%2
716
October1st to 15thNight
17%328%32%14%2
720
16th to endNight
12%434%39%8%1
768
November1st to 15thNight
11%8%37%31%8%2
890
16th to endNight
8%7%43%30%8%1
975
December1st to 15thNight
8%7%34%35%12%1
975
16th to endNight
8%6%35%35%11%2
1040
Page generated at 2018-02-13 18:46:06. Version ac04

Copyright 2018 A. Danko


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