Kilpatrick Point Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kilpatrick Point Observatory clear sky chart from 2005-11-06 to 2024-03-23.

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
46%
24151
13%
80083
9%
24044
50%
24044
12%
60357

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
24%
755
16%
4011
6%
737
33%
737
6%
2756
January11th to 20thNight
24%
756
19%
3956
5%
740
32%
740
5%
2705
January21st to endNight
22%
832
10%
4468
5%
814
33%
814
5%
3351
February1st to 10thNight
30%
760
16%
2280
8%
760
38%
760
13%
1731
February11th to 20thNight
20%
743
13%
2218
4%
739
29%
739
11%
1734
February21st to endNight
18%
628
12%
1884
4%
628
25%
628
9%
1516
March1st to 10thNight
28%
760
16%
2200
9%
760
34%
760
12%
1693
March11th to 20thNight
30%
760
12%
2090
6%
760
34%
760
12%
1655
March21st to endNight
31%
801
12%
2201
5%
801
37%
801
13%
1727
April1st to 10thNight
37%
715
15%
1975
9%
715
42%
715
15%
1491
April11th to 20thNight
42%
533
20%
1757
12%
533
52%
533
16%
1244
April21st to endNight
49%
540
16%
1620
11%
540
54%
540
15%
1214
May1st to 10thNight
48%
540
10%
1620
5%
540
52%
540
12%
1252
May11th to 20thNight
54%
531
9%
1593
6%
531
56%
531
11%
1272
May21st to endNight
64%
582
10%
1744
8%
582
65%
582
15%
1343
June1st to 10thNight
61%
540
9%
1620
8%
540
61%
540
14%
1256
June11th to 20thNight
70%
540
11%
1620
8%
540
71%
540
18%
1186
June21st to endNight
70%
540
12%
1620
10%
540
71%
540
17%
1218
July1st to 10thNight
64%
525
8%
1575
6%
525
65%
525
11%
1272
July11th to 20thNight
69%
522
6%
1566
5%
522
69%
522
12%
1272
July21st to endNight
72%
591
8%
1672
7%
558
72%
558
13%
1331
August1st to 10thNight
67%
537
10%
1600
9%
534
67%
534
15%
1240
August11th to 20thNight
66%
534
12%
1644
12%
534
66%
534
13%
1294
August21st to endNight
66%
594
9%
1980
10%
594
67%
594
12%
1567
September1st to 10thNight
65%
710
11%
1970
9%
710
65%
710
14%
1549
September11th to 20thNight
60%
720
13%
1980
11%
720
61%
720
15%
1548
September21st to endNight
63%
720
15%
1980
12%
720
66%
720
18%
1471
October1st to 10thNight
57%
720
20%
1980
15%
720
62%
720
21%
1411
October11th to 20thNight
48%
720
18%
2120
13%
720
53%
720
15%
1567
October21st to endNight
50%
792
19%
2376
14%
792
56%
792
16%
1727
November1st to 10thNight
52%
740
19%
2374
18%
740
56%
740
18%
1646
November11th to 20thNight
44%
760
18%
2470
15%
760
50%
760
13%
1834
November21st to endNight
42%
760
14%
2470
11%
760
49%
760
11%
1886
December1st to 10thNight
31%
760
14%
2470
8%
760
38%
760
9%
1927
December11th to 20thNight
36%
759
17%
2939
12%
758
41%
758
9%
2180
December21st to endNight
29%
831
8%
4440
7%
817
35%
817
5%
3291

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%36%6%35%5%6%7%36%
79080
Night
14%8%35%5%3445%7%40%
80812
TransparencyDay
30%36%7%12%12%3
78803
Night
29%36%7%12%13%3
80608
SeeingDay
21%12%21%21%16%9%
14014
Night
20%10%18%28%20%4
24172

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 10thDay
17%11%46%4235%5%6%37%
2836
11th to 20thDay
16%7%5%10%5%3444439%
2840
21st to endDay
23%12%34323335%39%
3124
February1st to 10thDay
19%10%46%4345%45%37%
1897
11th to 20thDay
23%8%35%5%24445%36%
1848
21st to endDay
24%9%26%5%33345%35%
1570
March1st to 10thDay
18%8%35%42445%7%41%
1978
11th to 20thDay
20%8%36%5%35%45%7%35%
2090
21st to endDay
17%9%36%6%35%446%36%
2200
April1st to 10thDay
13%7%35%5%45%5%6%7%40%
1999
11th to 20thDay
15%7%36%6%35%5%5%6%41%
2150
21st to endDay
14%6%35%6%345%5%8%41%
2340
May1st to 10thDay
15%6%25%6%36%5%5%7%39%
2340
11th to 20thDay
15%7%48%8%45%5%6%6%33%
2301
21st to endDay
12%8%35%6%46%7%8%9%32%
2531
June1st to 10thDay
12%6%37%8%5%6%6%7%9%30%
2340
11th to 20thDay
8%6%26%7%5%8%7%8%9%34%
2340
21st to endDay
10%5%36%9%47%7%7%9%32%
2340
July1st to 10thDay
10%7%49%9%6%8%6%8%10%23%
2340
11th to 20thDay
12%7%37%8%6%9%8%8%9%23%
2340
21st to endDay
10%7%48%8%5%9%7%7%9%25%
2547
August1st to 10thDay
12%7%37%9%49%7%8%9%26%
2327
11th to 20thDay
13%6%48%8%47%6%7%10%27%
2252
21st to endDay
13%7%47%8%48%7%7%8%27%
2366
September1st to 10thDay
12%6%38%8%5%5%7%7%7%33%
1980
11th to 20thDay
14%6%37%8%45%6%6%7%35%
1980
21st to endDay
13%5%36%6%45%5%6%7%42%
1980
October1st to 10thDay
11%6%245%345%46%51%
1980
11th to 20thDay
13%6%24423445%51%
1837
21st to endDay
14%5%245%23446%52%
1980
November1st to 10thDay
12%5%23324346%55%
1700
11th to 20thDay
14%5%24425%45%7%49%
1710
21st to endDay
16%8%34433446%45%
1710
December1st to 10thDay
24%8%35%5%3445%5%35%
1710
11th to 20thDay
17%8%35%5%3445%5%42%
2153
21st to endDay
17%9%6%7%5%3445%7%34%
3124
January1st to 10thNight
16%12%5%5%423335%40%
4109
11th to 20thNight
19%11%35%423446%40%
4120
21st to endNight
23%15%35%42333336%
4532
February1st to 10thNight
16%8%35%5%3445%6%40%
2280
11th to 20thNight
21%10%46%43434437%
2218
21st to endNight
24%10%45%5%3444433%
1884
March1st to 10thNight
15%9%35%5%35%346%41%
2200
11th to 20thNight
16%9%36%5%3445%7%37%
2090
21st to endNight
15%10%46%5%35%45%7%37%
2201
April1st to 10thNight
14%7%2442446%8%44%
1975
11th to 20thNight
13%7%35%5%2335%9%46%
1757
21st to endNight
12%6%25%43446%7%45%
1620
May1st to 10thNight
12%5%35%6%35%5%5%8%44%
1620
11th to 20thNight
12%7%36%6%35%6%6%9%37%
1592
21st to endNight
8%6%35%6%45%7%6%10%39%
1744
June1st to 10thNight
10%7%26%7%46%6%7%11%35%
1620
11th to 20thNight
6%5%245%45%5%7%11%46%
1620
21st to endNight
9%5%26%5%36%7%7%10%41%
1620
July1st to 10thNight
10%6%36%7%37%6%8%12%31%
1620
11th to 20thNight
10%5%36%6%47%6%9%13%31%
1620
21st to endNight
8%6%36%5%48%7%8%11%35%
1771
August1st to 10thNight
10%5%26%7%5%5%7%8%11%34%
1611
11th to 20thNight
10%7%37%7%45%6%6%9%37%
1644
21st to endNight
12%6%36%6%5%5%6%8%10%35%
1980
September1st to 10thNight
9%6%26%6%46%6%7%9%38%
1970
11th to 20thNight
11%6%26%5%45%6%6%8%41%
1980
21st to endNight
9%6%35%4345%6%7%48%
1980
October1st to 10thNight
11%7%24323446%55%
1980
11th to 20thNight
13%5%35%434346%49%
2120
21st to endNight
12%6%345%24345%53%
2376
November1st to 10thNight
11%5%3442345%7%52%
2374
11th to 20thNight
15%7%24424345%49%
2470
21st to endNight
16%8%25%42446%6%42%
2470
December1st to 10thNight
22%9%45%43445%6%34%
2470
11th to 20thNight
16%10%46%423446%41%
3042
21st to endNight
18%11%6%8%6%345%5%7%26%
4532

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
34%29%311%19%4
2837
11th to 20thDay
32%32%48%18%5%
2840
21st to endDay
40%25%411%16%5%
3124
February1st to 10thDay
33%34%411%13%4
1897
11th to 20thDay
32%36%311%13%5%
1858
21st to endDay
34%34%5%9%13%4
1570
March1st to 10thDay
27%34%6%13%15%5%
1978
11th to 20thDay
32%36%7%10%11%4
2090
21st to endDay
35%37%7%13%8%1
2200
April1st to 10thDay
26%36%7%16%11%3
1999
11th to 20thDay
26%35%5%12%18%4
2150
21st to endDay
28%36%6%18%10%2
2340
May1st to 10thDay
31%37%9%11%10%2
2340
11th to 20thDay
34%37%9%10%9%1
2305
21st to endDay
28%38%11%14%8%1
2531
June1st to 10thDay
31%38%12%14%4
2340
11th to 20thDay
28%38%11%14%7%1
2340
21st to endDay
28%39%11%12%9%1
2340
July1st to 10thDay
35%39%11%9%41
2275
11th to 20thDay
35%40%11%5%7%2
2271
21st to endDay
32%40%13%11%4
2405
August1st to 10thDay
30%39%11%15%41
2314
11th to 20thDay
33%36%12%12%6%1
2252
21st to endDay
35%39%9%10%5%2
2366
September1st to 10thDay
32%37%8%12%8%3
1980
11th to 20thDay
33%36%6%11%12%1
1980
21st to endDay
27%36%7%11%14%5%
1980
October1st to 10thDay
19%36%5%12%22%5%
1980
11th to 20thDay
24%36%6%14%14%6%
1837
21st to endDay
21%37%414%17%7%
1980
November1st to 10thDay
14%40%5%11%22%8%
1700
11th to 20thDay
23%39%412%16%6%
1710
21st to endDay
26%40%312%15%5%
1710
December1st to 10thDay
31%39%410%13%3
1710
11th to 20thDay
31%32%6%9%18%4
2150
21st to endDay
32%31%416%14%2
3124
January1st to 10thNight
34%27%411%20%4
4109
11th to 20thNight
33%28%313%15%8%
4120
21st to endNight
43%26%47%15%6%
4532
February1st to 10thNight
30%34%6%11%16%4
2280
11th to 20thNight
33%34%411%13%4
2219
21st to endNight
36%34%49%13%3
1884
March1st to 10thNight
30%35%5%11%14%5%
2200
11th to 20thNight
31%37%8%12%10%3
2090
21st to endNight
30%36%8%16%9%1
2201
April1st to 10thNight
24%37%7%15%14%2
1975
11th to 20thNight
23%35%5%15%18%4
1757
21st to endNight
25%37%8%18%10%1
1620
May1st to 10thNight
28%38%11%12%11%1
1620
11th to 20thNight
31%39%13%11%6%
1593
21st to endNight
25%40%11%16%6%1
1745
June1st to 10thNight
28%39%13%15%5%
1620
11th to 20thNight
22%38%16%18%6%1
1620
21st to endNight
24%38%13%13%9%3
1620
July1st to 10thNight
32%39%12%11%5%1
1575
11th to 20thNight
29%42%14%7%5%2
1566
21st to endNight
26%43%14%12%41
1672
August1st to 10thNight
25%40%14%16%5%
1600
11th to 20thNight
29%39%12%12%7%1
1644
21st to endNight
32%37%14%11%5%1
1980
September1st to 10thNight
29%39%11%11%9%2
1970
11th to 20thNight
29%37%9%14%11%
1980
21st to endNight
23%37%7%14%14%5%
1980
October1st to 10thNight
19%36%7%12%23%4
1980
11th to 20thNight
24%37%6%15%14%4
2120
21st to endNight
22%37%414%18%6%
2376
November1st to 10thNight
16%40%413%19%8%
2374
11th to 20thNight
23%40%412%16%5%
2470
21st to endNight
27%39%413%13%5%
2470
December1st to 10thNight
29%40%5%11%12%4
2470
11th to 20thNight
28%36%5%8%20%2
3044
21st to endNight
37%30%6%12%13%1
4532

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
33%23%33%9%2
270
11th to 20thDay
38%21%23%14%4
270
21st to endDay
33%27%28%9%3
297
February1st to 10thDay
33%23%31%11%1
270
11th to 20thDay
44%24%25%6%1
270
21st to endDay
43%25%25%6%
225
March1st to 10thDay
32%17%29%17%6%
348
11th to 20thDay
30%18%25%20%6%1
460
21st to endDay
28%20%25%20%6%1
470
April1st to 10thDay
25%15%26%21%11%1
420
11th to 20thDay
21%22%21%23%11%2
412
21st to endDay
23%15%21%22%15%4
420
May1st to 10thDay
20%20%22%20%12%6%
423
11th to 20thDay
17%10%24%23%17%10%
447
21st to endDay
17%8%21%22%19%14%
485
June1st to 10thDay
17%419%26%22%12%
450
11th to 20thDay
10%6%19%23%24%18%
450
21st to endDay
15%5%23%24%18%15%
450
July1st to 10thDay
12%5%13%24%27%18%
445
11th to 20thDay
9%414%25%26%23%
444
21st to endDay
10%311%24%27%24%
488
August1st to 10thDay
19%415%19%21%21%
446
11th to 20thDay
16%413%25%27%16%
439
21st to endDay
17%214%21%27%19%
495
September1st to 10thDay
12%412%24%33%15%
450
11th to 20thDay
16%5%13%23%30%13%
450
21st to endDay
14%8%15%28%27%8%
450
October1st to 10thDay
16%7%18%30%20%8%
450
11th to 20thDay
17%12%24%23%21%3
450
21st to endDay
21%12%23%25%17%2
495
November1st to 10thDay
20%12%30%23%10%4
298
11th to 20thDay
22%21%30%19%7%
270
21st to endDay
20%20%34%18%7%1
270
December1st to 10thDay
36%17%29%14%31
270
11th to 20thDay
30%17%30%18%5%1
270
21st to endDay
32%19%33%12%4
297
January1st to 10thNight
30%13%27%24%5%
760
11th to 20thNight
29%16%24%24%7%
760
21st to endNight
25%17%30%26%3
836
February1st to 10thNight
23%15%27%30%5%
760
11th to 20thNight
30%17%29%22%2
743
21st to endNight
33%18%27%18%4
628
March1st to 10thNight
23%17%29%27%4
760
11th to 20thNight
24%16%25%25%9%1
760
21st to endNight
24%14%26%27%9%1
801
April1st to 10thNight
21%14%25%29%10%1
715
11th to 20thNight
20%11%21%30%16%2
533
21st to endNight
15%10%21%35%18%2
540
May1st to 10thNight
16%10%20%31%21%2
540
11th to 20thNight
16%6%15%31%27%5%
531
21st to endNight
14%39%31%36%7%
584
June1st to 10thNight
13%310%32%34%8%
540
11th to 20thNight
7%211%30%34%15%
540
21st to endNight
11%27%29%41%9%
540
July1st to 10thNight
12%17%22%47%11%
525
11th to 20thNight
11%27%21%43%16%
522
21st to endNight
10%25%22%46%16%
591
August1st to 10thNight
13%3424%45%12%
537
11th to 20thNight
13%27%28%41%10%
534
21st to endNight
12%37%22%43%12%
594
September1st to 10thNight
13%28%28%39%10%
710
11th to 20thNight
15%411%27%38%6%
720
21st to endNight
14%411%32%35%4
720
October1st to 10thNight
17%7%15%28%27%8%
720
11th to 20thNight
17%9%18%32%22%2
720
21st to endNight
18%11%17%35%16%3
792
November1st to 10thNight
16%8%17%33%22%4
740
11th to 20thNight
21%12%18%33%14%2
760
21st to endNight
21%12%18%34%14%1
760
December1st to 10thNight
29%14%20%28%9%1
760
11th to 20thNight
25%14%21%32%7%1
760
21st to endNight
31%11%21%31%5%
836
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