Goodnight Ridge
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Goodnight Ridge clear sky chart from 2005-11-05 to 2018-04-23.

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
44%
16264
20%
49237
15%
16219
50%
16219
25%
32202

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
22%
849
14%
2590
7%
844
29%
844
15%
1934
January16th to endNight
23%
832
18%
2704
10%
832
33%
832
17%
1883
February1st to 15thNight
23%
764
14%
2292
5%
761
32%
761
17%
1670
February16th to endNight
18%
683
14%
2049
6%
683
26%
683
15%
1512
March1st to 15thNight
26%
780
16%
2285
9%
780
31%
780
19%
1613
March16th to endNight
34%
832
15%
2288
9%
832
39%
832
21%
1646
April1st to 15thNight
37%
594
22%
1957
14%
594
48%
594
24%
1205
April16th to endNight
39%
558
20%
1740
13%
558
46%
558
23%
1144
May1st to 15thNight
43%
539
15%
1619
9%
539
48%
539
20%
1145
May16th to endNight
61%
562
19%
1684
15%
561
65%
561
28%
1077
June1st to 15thNight
68%
540
20%
1586
16%
540
71%
540
39%
915
June16th to endNight
72%
540
20%
1440
16%
540
73%
540
39%
867
July1st to 15thNight
64%
510
16%
1372
13%
510
65%
510
30%
913
July16th to endNight
74%
564
21%
1595
19%
531
76%
531
39%
905
August1st to 15thNight
78%
539
24%
1609
22%
536
80%
536
40%
916
August16th to endNight
78%
573
23%
1899
25%
573
78%
573
36%
1043
September1st to 15thNight
65%
648
24%
1908
22%
648
67%
648
32%
1173
September16th to endNight
62%
717
29%
1980
24%
717
65%
717
35%
1202
October1st to 15thNight
57%
720
31%
1989
25%
720
62%
720
37%
1170
October16th to endNight
44%
768
27%
2406
21%
768
53%
768
30%
1463
November1st to 15thNight
45%
760
27%
2471
22%
760
54%
760
30%
1442
November16th to endNight
38%
780
24%
2535
19%
780
47%
780
24%
1601
December1st to 15thNight
31%
780
14%
2535
9%
780
37%
780
17%
1793
December16th to endNight
22%
832
16%
2704
8%
832
32%
832
15%
1970

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
15%7%35%5%25%45%7%38%
50248
Night
14%7%35%424447%41%
49426
TransparencyDay
44%5%10%21%14%2
49940
Night
43%5%10%21%16%3
49238
SeeingDay
17%6%21%23%19%11%
6310
Night
18%6%24%29%18%2
16266

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
21%9%47%5%24445%29%
1646
16th to endDay
16%10%5%6%5%24345%34%
1872
February1st to 15thDay
18%10%5%8%424436%31%
1897
16th to endDay
17%11%47%5%345%46%29%
1710
March1st to 15thDay
21%8%36%323435%36%
2005
16th to endDay
19%8%35%43445%6%32%
2288
April1st to 15thDay
16%7%344245%5%5%40%
2331
16th to endDay
16%7%25%43445%6%38%
2332
May1st to 15thDay
20%6%36%5%35%36%7%32%
2331
16th to endDay
11%5%26%6%36%5%6%8%36%
2431
June1st to 15thDay
10%425%436%5%6%7%42%
2370
16th to endDay
7%425%5%46%5%6%9%41%
2520
July1st to 15thDay
13%7%35%6%345%6%9%34%
2503
16th to endDay
8%5%246%36%7%7%10%36%
2465
August1st to 15thDay
9%4246%36%5%7%10%39%
2340
16th to endDay
8%425%436%6%7%9%40%
2300
September1st to 15thDay
14%5%25%5%26%5%5%7%40%
2040
16th to endDay
14%5%2342335%6%47%
1980
October1st to 15thDay
12%425%423446%51%
1971
16th to endDay
18%5%24413425%48%
1817
November1st to 15thDay
15%5%24423245%48%
1717
16th to endDay
17%7%24315%336%42%
1755
December1st to 15thDay
23%9%36%5%14345%32%
1755
16th to endDay
20%12%46%5%33346%30%
1872
January1st to 15thNight
17%10%5%9%6%2444429%
2590
16th to endNight
17%11%46%42434435%
2704
February1st to 15thNight
21%9%46%5%245%45%30%
2283
16th to endNight
18%12%5%8%5%34346%29%
2049
March1st to 15thNight
19%9%36%6%2344435%
2285
16th to endNight
17%9%46%6%33447%34%
2288
April1st to 15thNight
16%5%24424447%43%
1957
16th to endNight
14%6%36%424445%41%
1740
May1st to 15thNight
16%6%26%6%36%5%5%6%33%
1619
16th to endNight
7%4345%36%6%7%9%41%
1682
June1st to 15thNight
6%32442445%10%51%
1586
16th to endNight
5%314335%5%7%13%45%
1440
July1st to 15thNight
10%425%5%35%35%7%43%
1453
16th to endNight
6%223425%47%11%49%
1703
August1st to 15thNight
5%2233345%6%9%52%
1620
16th to endNight
4323435%5%6%10%50%
1899
September1st to 15thNight
12%42343445%8%47%
1908
16th to endNight
11%423433346%53%
1980
October1st to 15thNight
10%424323446%52%
1989
16th to endNight
16%5%24423335%48%
2406
November1st to 15thNight
13%5%23423446%49%
2471
16th to endNight
18%7%24314335%43%
2535
December1st to 15thNight
21%9%45%42445%6%31%
2535
16th to endNight
23%12%36%423345%29%
2704

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
56%48%17%11%1
1647
16th to endDay
51%39%24%8%1
1872
February1st to 15thDay
55%37%22%7%1
1899
16th to endDay
54%410%19%8%1
1710
March1st to 15thDay
51%410%18%13%1
2005
16th to endDay
52%411%22%7%
2289
April1st to 15thDay
44%5%9%23%14%1
2331
16th to endDay
45%6%8%21%14%3
2332
May1st to 15thDay
51%6%10%18%12%
2331
16th to endDay
43%8%13%20%12%2
2435
June1st to 15thDay
38%7%11%23%15%1
2370
16th to endDay
37%7%12%19%19%3
2520
July1st to 15thDay
45%7%12%16%13%4
2355
16th to endDay
37%11%14%22%12%2
2310
August1st to 15thDay
38%7%12%22%16%1
2327
16th to endDay
37%7%12%21%16%4
2300
September1st to 15thDay
41%6%10%18%17%5%
2040
16th to endDay
37%39%21%24%2
1980
October1st to 15thDay
34%48%25%24%3
1971
16th to endDay
40%38%25%19%3
1817
November1st to 15thDay
38%37%25%18%6%
1717
16th to endDay
43%36%25%19%1
1755
December1st to 15thDay
54%310%19%9%1
1755
16th to endDay
55%411%19%7%
1872
January1st to 15thNight
57%47%14%13%1
2590
16th to endNight
52%38%22%10%1
2704
February1st to 15thNight
54%410%20%9%1
2292
16th to endNight
56%311%16%9%1
2049
March1st to 15thNight
51%47%19%14%2
2285
16th to endNight
51%5%11%21%9%1
2288
April1st to 15thNight
40%5%9%21%19%3
1957
16th to endNight
44%5%8%21%14%5%
1740
May1st to 15thNight
48%6%10%21%10%1
1620
16th to endNight
35%9%13%22%15%4
1684
June1st to 15thNight
28%6%14%26%18%4
1586
16th to endNight
28%7%17%22%17%5%
1440
July1st to 15thNight
38%6%11%21%15%4
1372
16th to endNight
26%7%16%27%18%3
1595
August1st to 15thNight
25%8%16%25%20%3
1609
16th to endNight
27%7%14%25%21%4
1899
September1st to 15thNight
35%5%11%20%21%6%
1908
16th to endNight
33%5%7%23%25%4
1980
October1st to 15thNight
32%38%24%25%4
1989
16th to endNight
39%27%25%21%3
2406
November1st to 15thNight
36%38%22%22%6%
2471
16th to endNight
43%38%23%19%1
2535
December1st to 15thNight
52%5%10%18%10%1
2535
16th to endNight
57%310%18%8%1
2704

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%11%36%13%6%2
135
16th to endDay
22%19%39%14%3
144
February1st to 15thDay
25%17%36%15%4
135
16th to endDay
33%14%30%19%2
120
March1st to 15thDay
21%13%43%16%3
190
16th to endDay
26%11%31%21%7%1
352
April1st to 15thDay
21%13%24%26%12%2
330
16th to endDay
20%6%24%25%14%7%
289
May1st to 15thDay
23%11%23%19%14%7%
288
16th to endDay
16%223%26%16%14%
331
June1st to 15thDay
12%112%26%30%16%
345
16th to endDay
10%320%28%25%12%
495
July1st to 15thDay
16%216%27%25%11%
459
16th to endDay
10%8%22%31%26%
326
August1st to 15thDay
13%17%20%30%27%
313
16th to endDay
10%9%27%28%23%
332
September1st to 15thDay
15%312%20%30%18%
315
16th to endDay
16%210%21%31%17%
314
October1st to 15thDay
16%319%26%23%11%
315
16th to endDay
15%7%26%26%21%2
233
November1st to 15thDay
23%7%21%26%14%6%
135
16th to endDay
22%428%30%10%2
135
December1st to 15thDay
19%11%33%25%8%1
135
16th to endDay
27%16%41%11%2
144
January1st to 15thNight
22%13%33%24%5%
849
16th to endNight
24%13%34%26%1
832
February1st to 15thNight
27%11%32%26%1
764
16th to endNight
25%11%39%20%3
683
March1st to 15thNight
24%11%33%25%5%
780
16th to endNight
22%8%29%29%10%
832
April1st to 15thNight
18%9%31%28%10%
594
16th to endNight
18%6%28%29%13%1
558
May1st to 15thNight
21%422%32%16%2
540
16th to endNight
9%218%36%26%7%
563
June1st to 15thNight
6%16%40%32%3
540
16th to endNight
4213%43%32%2
540
July1st to 15thNight
12%13%28%39%4
510
16th to endNight
7%17%31%42%9%
564
August1st to 15thNight
7%6%33%44%7%
539
16th to endNight
6%6%36%45%4
573
September1st to 15thNight
14%111%27%39%5%
648
16th to endNight
12%313%27%35%6%
717
October1st to 15thNight
13%320%29%26%6%
720
16th to endNight
18%428%31%15%1
768
November1st to 15thNight
16%8%25%28%18%2
760
16th to endNight
22%8%26%29%12%
780
December1st to 15thNight
26%10%26%26%8%
780
16th to endNight
29%9%34%22%4
832
Page generated at 2018-04-24 10:02:59. Version ac04

Copyright 2018 A. Danko


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