Pikangikum
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pikangikum clear sky chart from 2005-11-05 to 2017-11-30.

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
30%
16673
9%
47710
5%
16627
34%
16627
15%
36513

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
19%
900
7%
2685
4%
895
23%
895
9%
2249
January16th to endNight
23%
960
7%
2880
4%
960
27%
960
9%
2421
February1st to 15thNight
32%
878
12%
2294
6%
875
35%
875
15%
1794
February16th to endNight
34%
789
11%
2051
6%
789
37%
789
15%
1619
March1st to 15thNight
29%
642
13%
2082
8%
642
35%
642
13%
1573
March16th to endNight
33%
576
15%
2088
12%
576
43%
576
16%
1428
April1st to 15thNight
38%
539
18%
1735
15%
539
46%
539
25%
1123
April16th to endNight
35%
540
17%
1568
8%
540
42%
540
25%
1033
May1st to 15thNight
26%
540
9%
1440
3%
540
28%
540
17%
1100
May16th to endNight
33%
563
6%
1327
3%
561
36%
561
22%
988
June1st to 15thNight
39%
540
0%
1260
0%
540
39%
540
24%
927
June16th to endNight
40%
540
0%
1260
0%
540
40%
540
27%
901
July1st to 15thNight
48%
510
0%
1190
0%
510
48%
510
35%
797
July16th to endNight
46%
564
7%
1239
4%
531
47%
531
32%
855
August1st to 15thNight
51%
539
12%
1454
5%
536
53%
536
29%
947
August16th to endNight
48%
573
15%
1719
11%
573
52%
573
27%
1102
September1st to 15thNight
41%
540
12%
1791
10%
540
46%
540
21%
1193
September16th to endNight
34%
576
11%
1984
9%
576
40%
576
18%
1364
October1st to 15thNight
27%
720
12%
2160
7%
720
32%
720
16%
1592
October16th to endNight
21%
859
7%
2491
4%
859
24%
859
10%
2050
November1st to 15thNight
20%
950
8%
2661
3%
950
24%
950
10%
2208
November16th to endNight
16%
975
5%
2771
2%
975
19%
975
7%
2440
December1st to 15thNight
22%
900
5%
2700
3%
900
25%
900
7%
2302
December16th to endNight
21%
960
7%
2880
4%
960
25%
960
7%
2507

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
16%11%47%6%35%45%6%27%
48733
Night
14%11%5%8%6%35%5%5%5%27%
47855
Cloud CoverDay
16%10%47%6%35%45%6%27%
48743
Night
14%11%5%8%6%35%5%5%6%27%
47858
TransparencyDay
56%5%11%17%6%
48395
Night
57%5%11%17%6%
47710
SeeingDay
22%12%30%21%10%3
6556
Night
19%9%30%27%11%1
16675

By Month

Percentage Cloud Cover NE (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
9%15%6%13%7%7%8%6%5%6%13%
1253
16th to endDay
12%14%6%12%9%5%6%8%8%410%
1344
February1st to 15thDay
6%9%48%7%5%11%9%8%7%23%
1566
16th to endDay
6%15%6%10%8%47%5%6%6%20%
1422
March1st to 15thDay
12%14%6%8%6%44346%28%
1879
16th to endDay
13%11%5%8%7%35%46%7%27%
2136
April1st to 15thDay
11%11%47%5%35%446%35%
2213
16th to endDay
12%9%35%43436%7%40%
2391
May1st to 15thDay
20%10%37%6%24445%29%
2511
16th to endDay
22%9%35%5%245%45%31%
2785
June1st to 15thDay
20%6%36%6%345%5%6%29%
2700
16th to endDay
20%7%46%6%345%5%6%28%
2700
July1st to 15thDay
16%6%36%6%35%45%7%33%
2700
16th to endDay
16%6%36%5%345%6%8%34%
2845
August1st to 15thDay
14%6%37%7%46%45%6%33%
2497
16th to endDay
19%5%245%345%5%7%37%
2483
September1st to 15thDay
19%8%26%5%24347%33%
2169
16th to endDay
24%11%36%433336%29%
1962
October1st to 15thDay
21%17%46%424446%23%
1800
16th to endDay
25%22%6%8%5%3333414%
1731
November1st to 15thDay
19%20%7%10%5%34435%16%
1527
16th to endDay
16%16%9%12%10%47%43410%
1515
December1st to 15thDay
10%13%9%12%10%6%8%5%4413%
1260
16th to endDay
13%17%7%14%10%5%6%5%45%9%
1344
January1st to 15thNight
9%13%7%12%10%5%8%6%6%413%
2685
16th to endNight
11%14%7%11%8%5%8%7%6%5%12%
2880
February1st to 15thNight
7%10%5%8%7%6%10%9%5%7%21%
2291
16th to endNight
6%10%6%11%10%48%6%6%6%22%
2051
March1st to 15thNight
12%14%5%8%6%46%44429%
2070
16th to endNight
13%11%48%5%33345%35%
2088
April1st to 15thNight
9%8%46%5%33446%43%
1735
16th to endNight
9%10%46%43435%6%41%
1568
May1st to 15thNight
20%10%46%5%245%5%5%27%
1440
16th to endNight
22%8%244245%46%33%
1326
June1st to 15thNight
17%8%25%5%35%6%6%7%33%
1260
16th to endNight
16%5%245%336%6%7%37%
1260
July1st to 15thNight
10%413426%7%6%8%43%
1260
16th to endNight
12%426%425%348%45%
1323
August1st to 15thNight
13%4144245%5%8%45%
1461
16th to endNight
15%42442345%7%44%
1719
September1st to 15thNight
19%7%35%423345%40%
1791
16th to endNight
19%7%24424448%35%
1984
October1st to 15thNight
19%11%36%4335%5%6%30%
2160
16th to endNight
23%18%5%7%5%23335%20%
2491
November1st to 15thNight
18%17%6%10%5%3434420%
2661
16th to endNight
16%17%7%13%9%45%43413%
2771
December1st to 15thNight
10%14%7%12%10%5%7%7%5%413%
2700
16th to endNight
11%18%8%13%9%5%7%6%4410%
2880

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
9%14%7%12%8%6%8%6%5%6%13%
1254
16th to endDay
11%14%7%12%9%5%6%8%8%411%
1344
February1st to 15thDay
6%9%48%7%5%10%9%8%7%23%
1566
16th to endDay
7%14%6%10%8%47%6%6%6%20%
1422
March1st to 15thDay
12%14%6%8%6%34346%28%
1890
16th to endDay
13%12%48%7%25%45%7%27%
2134
April1st to 15thDay
11%11%47%6%34446%36%
2213
16th to endDay
12%8%35%43435%7%40%
2391
May1st to 15thDay
21%10%37%5%35%345%29%
2511
16th to endDay
22%9%35%5%2444432%
2785
June1st to 15thDay
20%6%36%5%345%5%6%29%
2700
16th to endDay
20%7%36%6%35%5%5%7%28%
2700
July1st to 15thDay
17%5%36%6%36%45%7%34%
2700
16th to endDay
16%6%36%4445%5%7%34%
2845
August1st to 15thDay
15%6%37%6%46%45%6%33%
2497
16th to endDay
19%5%25%5%3445%7%37%
2483
September1st to 15thDay
19%8%26%6%24346%34%
2169
16th to endDay
23%11%35%433336%29%
1962
October1st to 15thDay
21%16%46%434446%23%
1800
16th to endDay
24%23%5%7%5%32335%14%
1731
November1st to 15thDay
19%20%6%10%5%34435%16%
1527
16th to endDay
16%16%9%12%11%47%33410%
1515
December1st to 15thDay
10%13%8%12%10%6%8%5%5%413%
1260
16th to endDay
13%16%7%14%10%5%6%5%4410%
1344
January1st to 15thNight
9%13%7%12%10%5%9%6%6%414%
2685
16th to endNight
11%14%7%11%8%5%8%7%6%5%13%
2880
February1st to 15thNight
7%10%5%7%7%6%10%9%5%8%21%
2284
16th to endNight
7%10%6%11%10%47%6%6%6%22%
2051
March1st to 15thNight
13%13%5%8%5%46%44329%
2082
16th to endNight
13%11%47%5%33345%35%
2086
April1st to 15thNight
9%8%46%5%33445%43%
1735
16th to endNight
9%10%46%42425%6%42%
1568
May1st to 15thNight
21%10%47%5%34446%27%
1439
16th to endNight
22%8%2442445%6%33%
1327
June1st to 15thNight
18%7%25%5%35%5%6%6%33%
1260
16th to endNight
17%4336%445%6%7%37%
1260
July1st to 15thNight
10%414426%6%6%9%42%
1260
16th to endNight
12%5%25%433448%45%
1323
August1st to 15thNight
13%41442445%8%45%
1461
16th to endNight
15%5%2442345%7%44%
1719
September1st to 15thNight
19%7%25%432345%40%
1791
16th to endNight
20%7%245%14447%36%
1984
October1st to 15thNight
20%11%36%434447%30%
2160
16th to endNight
23%19%5%7%5%3333420%
2491
November1st to 15thNight
18%17%6%9%5%3434420%
2661
16th to endNight
16%17%7%12%10%46%33413%
2771
December1st to 15thNight
10%15%8%12%10%5%7%7%5%413%
2700
16th to endNight
11%17%9%13%9%5%6%6%5%410%
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
69%5%10%11%3
1254
16th to endDay
70%37%11%5%
1344
February1st to 15thDay
55%5%10%21%6%
1567
16th to endDay
62%311%17%6%
1422
March1st to 15thDay
58%411%17%7%
1890
16th to endDay
55%5%13%16%6%2
2136
April1st to 15thDay
49%39%20%13%2
2213
16th to endDay
42%5%9%23%15%3
2391
May1st to 15thDay
55%48%21%8%1
2511
16th to endDay
54%5%9%18%10%1
2789
June1st to 15thDay
52%7%9%18%11%
2700
16th to endDay
54%6%14%15%7%
2700
July1st to 15thDay
47%7%12%23%7%1
2541
16th to endDay
47%8%15%22%5%
2666
August1st to 15thDay
49%8%15%22%5%
2480
16th to endDay
44%7%19%21%6%
2483
September1st to 15thDay
51%6%16%20%5%
2169
16th to endDay
57%6%13%19%3
1962
October1st to 15thDay
61%7%13%14%3
1800
16th to endDay
74%5%11%7%1
1731
November1st to 15thDay
71%5%11%9%2
1527
16th to endDay
78%47%7%2
1515
December1st to 15thDay
73%49%11%1
1260
16th to endDay
75%45%9%3
1344
January1st to 15thNight
70%5%8%14%1
2685
16th to endNight
70%5%6%13%3
2880
February1st to 15thNight
59%6%9%18%6%
2294
16th to endNight
60%5%9%18%5%
2051
March1st to 15thNight
58%5%8%17%8%1
2082
16th to endNight
52%411%20%7%3
2088
April1st to 15thNight
42%410%21%17%2
1735
16th to endNight
43%49%20%18%2
1568
May1st to 15thNight
56%5%8%20%8%1
1440
16th to endNight
51%5%8%17%14%3
1327
June1st to 15thNight
48%6%10%20%13%1
1260
16th to endNight
43%6%17%23%7%
1260
July1st to 15thNight
33%9%18%25%11%1
1190
16th to endNight
39%6%15%28%8%1
1239
August1st to 15thNight
35%9%18%26%10%
1454
16th to endNight
37%8%19%26%6%
1719
September1st to 15thNight
46%5%15%25%6%
1791
16th to endNight
46%8%19%21%4
1984
October1st to 15thNight
53%7%15%19%3
2160
16th to endNight
67%5%12%12%1
2491
November1st to 15thNight
67%5%11%11%3
2661
16th to endNight
75%5%9%6%2
2771
December1st to 15thNight
72%5%11%8%1
2700
16th to endNight
75%45%10%3
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
312%51%27%5%
90
16th to endDay
31%5%33%17%11%1
96
February1st to 15thDay
18%17%43%12%7%
90
16th to endDay
16%18%37%16%11%1
81
March1st to 15thDay
25%11%32%18%10%2
90
16th to endDay
29%10%26%25%5%1
120
April1st to 15thDay
18%12%27%29%9%2
332
16th to endDay
16%15%35%21%9%1
450
May1st to 15thDay
26%15%29%19%6%2
468
16th to endDay
26%12%29%20%7%2
517
June1st to 15thDay
21%14%32%18%7%5%
495
16th to endDay
24%10%28%20%9%6%
495
July1st to 15thDay
17%12%29%24%12%4
475
16th to endDay
17%12%29%21%15%5%
515
August1st to 15thDay
16%10%27%23%16%5%
493
16th to endDay
21%8%26%26%16%1
523
September1st to 15thDay
25%7%28%26%10%1
324
16th to endDay
33%14%26%22%2
168
October1st to 15thDay
36%17%29%14%2
135
16th to endDay
36%5%41%11%4
144
November1st to 15thDay
35%13%28%19%2
135
16th to endDay
29%23%31%11%4
134
December1st to 15thDay
18%10%36%17%14%2
90
16th to endDay
21%9%32%27%8%1
96
January1st to 15thNight
15%12%35%24%9%2
900
16th to endNight
16%10%36%29%7%
960
February1st to 15thNight
11%8%37%30%11%1
880
16th to endNight
12%8%30%32%13%2
789
March1st to 15thNight
17%11%30%27%10%1
642
16th to endNight
19%10%28%24%14%2
576
April1st to 15thNight
12%9%31%34%9%1
539
16th to endNight
13%10%32%31%10%1
540
May1st to 15thNight
25%11%30%24%7%
540
16th to endNight
25%8%26%27%10%
563
June1st to 15thNight
20%6%25%31%14%1
540
16th to endNight
20%6%25%28%17%
540
July1st to 15thNight
10%5%31%35%14%1
510
16th to endNight
13%5%28%31%19%1
564
August1st to 15thNight
15%323%34%20%2
539
16th to endNight
18%5%24%31%17%2
573
September1st to 15thNight
24%5%23%32%12%1
540
16th to endNight
24%8%27%27%9%1
576
October1st to 15thNight
26%9%31%24%7%
720
16th to endNight
33%8%27%20%9%
859
November1st to 15thNight
26%11%29%22%7%1
950
16th to endNight
25%12%33%22%6%
975
December1st to 15thNight
17%9%34%26%9%1
900
16th to endNight
18%11%30%26%10%2
960
Page generated at 2017-12-01 11:13:43. Version ac04

Copyright 2017 A. Danko


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