Kindersley
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kindersley 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
41%
15463
12%
46793
8%
15436
45%
15436
21%
32082

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
35%
895
8%
2685
5%
895
37%
895
15%
1994
January16th to endNight
27%
960
13%
2877
5%
960
35%
960
16%
2105
February1st to 15thNight
40%
702
9%
2291
8%
701
43%
701
16%
1648
February16th to endNight
42%
632
13%
2052
10%
632
47%
632
17%
1497
March1st to 15thNight
36%
720
13%
2076
7%
720
42%
720
21%
1474
March16th to endNight
36%
748
10%
2091
5%
747
40%
747
17%
1577
April1st to 15thNight
37%
539
12%
1734
7%
539
42%
539
20%
1198
April16th to endNight
40%
540
15%
1577
11%
540
44%
540
22%
1097
May1st to 15thNight
49%
539
11%
1440
8%
539
51%
539
29%
943
May16th to endNight
47%
397
7%
1332
6%
396
49%
396
20%
899
June1st to 15thNight
41%
360
0%
1260
0%
360
41%
360
18%
855
June16th to endNight
56%
360
0%
1260
0%
360
56%
360
24%
769
July1st to 15thNight
62%
340
1%
1190
0%
340
62%
340
31%
658
July16th to endNight
61%
376
11%
1239
9%
354
65%
354
39%
610
August1st to 15thNight
67%
524
13%
1472
10%
522
69%
522
39%
858
August16th to endNight
60%
573
21%
1719
16%
573
63%
573
40%
944
September1st to 15thNight
54%
540
17%
1791
15%
540
58%
540
33%
1023
September16th to endNight
49%
650
23%
1884
16%
650
57%
650
36%
1106
October1st to 15thNight
42%
660
19%
1980
11%
660
49%
660
25%
1311
October16th to endNight
39%
773
15%
2263
9%
773
44%
773
23%
1540
November1st to 15thNight
35%
875
16%
2450
8%
875
41%
875
22%
1707
November16th to endNight
30%
900
12%
2550
6%
900
35%
900
18%
1878
December1st to 15thNight
29%
900
6%
2700
3%
900
32%
900
10%
2210
December16th to endNight
33%
960
11%
2880
5%
960
38%
960
14%
2181

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
10%8%37%6%35%5%5%7%34%
48104
Night
8%8%47%7%35%5%6%8%35%
46942
TransparencyDay
46%7%16%21%6%
47754
Night
45%7%16%21%8%1
46796
SeeingDay
15%7%25%29%17%5%
6148
Night
12%5%29%34%15%2
15476

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
8%11%410%9%46%7%7%8%22%
1253
16th to endDay
411%411%7%47%6%5%7%28%
1353
February1st to 15thDay
8%12%6%9%9%5%7%5%45%24%
1575
16th to endDay
9%12%7%13%7%47%447%21%
1422
March1st to 15thDay
7%10%49%9%5%6%5%6%10%25%
1884
16th to endDay
10%12%5%10%8%36%5%6%7%23%
2130
April1st to 15thDay
11%11%46%5%46%5%6%7%29%
2212
16th to endDay
14%10%36%7%45%446%32%
2382
May1st to 15thDay
13%6%26%6%35%5%5%6%37%
2511
16th to endDay
18%8%36%6%445%47%30%
2778
June1st to 15thDay
17%7%37%6%35%6%6%7%28%
2700
16th to endDay
14%6%35%6%36%6%5%7%35%
2700
July1st to 15thDay
6%425%5%35%5%6%10%43%
2700
16th to endDay
6%314325%5%7%9%51%
2846
August1st to 15thDay
10%5%25%4235%5%9%44%
2478
16th to endDay
8%42442446%8%49%
2483
September1st to 15thDay
13%5%16%5%23345%47%
2169
16th to endDay
10%424323448%51%
1865
October1st to 15thDay
12%9%35%44436%7%39%
1650
16th to endDay
8%10%38%5%45%47%7%34%
1594
November1st to 15thDay
7%10%6%7%5%345%48%35%
1408
16th to endDay
8%13%6%10%8%5%6%447%24%
1407
December1st to 15thDay
8%12%5%12%10%5%7%7%6%7%15%
1260
16th to endDay
6%11%6%11%10%49%6%5%6%21%
1344
January1st to 15thNight
5%10%5%8%8%6%8%6%6%8%24%
2685
16th to endNight
49%49%10%46%5%6%8%29%
2877
February1st to 15thNight
5%8%7%10%10%36%5%6%7%29%
2282
16th to endNight
6%10%5%9%7%5%6%5%8%8%26%
2052
March1st to 15thNight
7%7%47%7%36%6%7%7%33%
2076
16th to endNight
11%10%5%8%7%45%5%7%7%27%
2089
April1st to 15thNight
9%9%47%5%35%5%7%9%31%
1734
16th to endNight
11%9%46%5%45%45%6%35%
1577
May1st to 15thNight
12%5%25%5%3446%8%39%
1439
16th to endNight
14%8%444345%5%8%36%
1332
June1st to 15thNight
15%7%26%6%25%5%8%7%31%
1260
16th to endNight
12%4246%35%5%7%8%41%
1260
July1st to 15thNight
6%323325%5%7%10%49%
1260
16th to endNight
32133245%5%10%56%
1323
August1st to 15thNight
6%213425%5%7%11%48%
1479
16th to endNight
6%41432445%8%53%
1719
September1st to 15thNight
10%5%14423346%52%
1791
16th to endNight
7%4234245%5%8%51%
1884
October1st to 15thNight
9%8%36%6%345%5%6%39%
1980
16th to endNight
9%11%35%6%345%5%8%36%
2263
November1st to 15thNight
9%10%45%6%35%5%5%7%37%
2450
16th to endNight
6%12%6%10%8%34447%31%
2550
December1st to 15thNight
7%13%6%12%10%6%8%45%8%17%
2700
16th to endNight
49%5%11%10%5%6%6%6%7%24%
2880

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
57%9%13%14%4
1253
16th to endDay
52%8%15%14%6%1
1353
February1st to 15thDay
59%7%12%15%4
1575
16th to endDay
61%5%12%12%7%
1422
March1st to 15thDay
53%7%20%15%2
1884
16th to endDay
58%9%14%14%2
2131
April1st to 15thDay
50%8%15%17%7%1
2212
16th to endDay
52%6%13%18%6%1
2382
May1st to 15thDay
45%5%15%24%8%
2511
16th to endDay
52%7%11%19%8%
2783
June1st to 15thDay
52%8%13%19%6%
2700
16th to endDay
46%9%17%20%6%
2700
July1st to 15thDay
32%9%19%30%7%
2541
16th to endDay
27%9%21%31%8%
2667
August1st to 15thDay
36%8%23%23%6%
2460
16th to endDay
30%7%18%31%12%
2483
September1st to 15thDay
38%5%15%23%13%4
2169
16th to endDay
31%6%15%34%10%1
1865
October1st to 15thDay
44%6%18%24%6%
1650
16th to endDay
45%7%18%22%5%
1594
November1st to 15thDay
47%6%17%22%6%
1408
16th to endDay
60%6%14%15%2
1407
December1st to 15thDay
64%9%13%9%2
1260
16th to endDay
60%6%12%14%4
1344
January1st to 15thNight
53%8%18%15%4
2685
16th to endNight
50%8%15%16%6%1
2877
February1st to 15thNight
51%7%16%16%7%
2293
16th to endNight
50%9%13%17%8%
2052
March1st to 15thNight
46%8%19%18%6%
2076
16th to endNight
54%6%14%18%4
2092
April1st to 15thNight
47%7%13%21%10%
1734
16th to endNight
47%5%11%20%11%2
1577
May1st to 15thNight
40%5%11%26%15%
1440
16th to endNight
45%7%12%21%11%1
1332
June1st to 15thNight
46%7%16%20%8%
1260
16th to endNight
36%8%19%25%9%
1260
July1st to 15thNight
26%10%22%29%10%
1190
16th to endNight
21%8%21%35%12%1
1239
August1st to 15thNight
26%8%23%31%8%1
1472
16th to endNight
27%5%15%32%17%2
1719
September1st to 15thNight
32%5%13%24%16%6%
1791
16th to endNight
29%7%11%32%16%2
1884
October1st to 15thNight
42%5%15%24%10%
1980
16th to endNight
45%6%17%24%6%
2263
November1st to 15thNight
45%6%16%21%7%1
2450
16th to endNight
53%6%19%15%6%
2550
December1st to 15thNight
64%8%13%11%2
2700
16th to endNight
56%7%16%14%4
2880

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
8%6%18%33%28%5%
60
16th to endDay
12%435%29%13%4
65
February1st to 15thDay
21%432%28%11%2
90
16th to endDay
14%230%27%19%4
81
March1st to 15thDay
13%12%34%29%8%1
207
16th to endDay
17%12%32%28%8%
288
April1st to 15thDay
14%18%34%22%8%1
269
16th to endDay
23%9%23%27%15%1
312
May1st to 15thDay
16%7%24%31%15%4
468
16th to endDay
19%6%21%26%17%8%
517
June1st to 15thDay
18%8%27%24%16%4
495
16th to endDay
16%8%23%29%17%4
495
July1st to 15thDay
10%321%31%24%8%
475
16th to endDay
8%424%31%24%5%
515
August1st to 15thDay
14%318%30%24%10%
436
16th to endDay
9%6%20%34%25%3
332
September1st to 15thDay
21%7%19%30%14%5%
315
16th to endDay
13%9%27%28%17%4
243
October1st to 15thDay
25%5%34%20%11%3
90
16th to endDay
13%8%25%37%14%1
96
November1st to 15thDay
11%340%30%14%1
90
16th to endDay
12%8%24%27%18%8%
85
December1st to 15thDay
8%328%40%11%8%
60
16th to endDay
15%132%34%12%3
64
January1st to 15thNight
9%8%32%35%11%2
900
16th to endNight
10%9%40%30%9%1
960
February1st to 15thNight
8%6%27%36%16%3
709
16th to endNight
10%328%31%21%4
632
March1st to 15thNight
10%5%33%35%11%2
720
16th to endNight
14%7%27%34%12%3
748
April1st to 15thNight
13%6%34%31%10%2
539
16th to endNight
17%6%28%30%15%1
540
May1st to 15thNight
15%420%40%16%1
540
16th to endNight
17%5%21%32%19%3
397
June1st to 15thNight
20%5%23%33%14%2
360
16th to endNight
14%417%38%23%1
360
July1st to 15thNight
9%219%43%22%1
340
16th to endNight
5%226%39%24%1
376
August1st to 15thNight
7%117%39%29%4
524
16th to endNight
7%224%38%24%1
573
September1st to 15thNight
13%322%36%22%1
540
16th to endNight
9%432%33%17%2
650
October1st to 15thNight
16%428%32%15%2
660
16th to endNight
15%6%30%34%12%
773
November1st to 15thNight
15%8%32%31%10%2
875
16th to endNight
11%9%34%33%9%1
900
December1st to 15thNight
14%6%33%28%14%2
900
16th to endNight
9%432%33%17%3
960
Page generated at 2017-09-22 05:35:39. Version ac04

Copyright 2017 A. Danko


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