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Pigeon Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pigeon Lake clear sky chart from 2005-11-05 to 2019-09-17.

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%
17697
11%
54428
8%
17672
43%
17672
19%
38339

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
31%
1045
9%
3135
5%
1045
35%
1045
15%
2369
January16th to endNight
29%
1019
15%
3259
9%
1019
37%
1019
15%
2357
February1st to 15thNight
36%
819
12%
2867
11%
818
40%
818
15%
2042
February16th to endNight
41%
736
12%
2328
11%
736
45%
736
18%
1643
March1st to 15thNight
40%
840
18%
2481
13%
840
46%
840
22%
1710
March16th to endNight
38%
896
9%
2421
4%
896
41%
896
18%
1846
April1st to 15thNight
37%
718
11%
1978
6%
718
40%
718
18%
1490
April16th to endNight
39%
624
11%
1872
9%
624
43%
624
21%
1287
May1st to 15thNight
44%
429
8%
1540
8%
429
46%
429
16%
1052
May16th to endNight
43%
438
1%
1533
0%
438
44%
438
17%
1063
June1st to 15thNight
41%
420
0%
1470
0%
420
41%
420
14%
1075
June16th to endNight
48%
420
0%
1268
0%
420
48%
420
21%
880
July1st to 15thNight
56%
400
0%
1349
0%
400
56%
400
20%
897
July16th to endNight
58%
440
3%
1463
2%
418
58%
418
21%
936
August1st to 15thNight
59%
414
6%
1631
9%
412
61%
412
20%
1000
August16th to endNight
55%
669
13%
2007
11%
669
58%
669
28%
1272
September1st to 15thNight
54%
756
14%
2079
10%
756
55%
756
28%
1380
September16th to endNight
48%
780
18%
2157
10%
780
53%
780
32%
1360
October1st to 15thNight
39%
780
15%
2330
10%
780
44%
780
20%
1652
October16th to endNight
38%
832
16%
2704
11%
832
46%
832
22%
1790
November1st to 15thNight
31%
1002
12%
2896
7%
1002
36%
1002
16%
2190
November16th to endNight
28%
1050
11%
3150
5%
1050
34%
1050
17%
2316
December1st to 15thNight
33%
1050
14%
3150
9%
1050
36%
1050
16%
2319
December16th to endNight
35%
1120
14%
3360
7%
1120
40%
1120
18%
2413

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%37%6%35%5%6%8%31%
56291
Night
9%10%48%7%45%5%6%7%30%
54575
Cloud CoverDay
11%9%37%6%35%5%6%7%32%
56292
Night
9%10%48%7%45%5%6%7%30%
54578
TransparencyDay
48%5%18%20%5%
55941
Night
50%5%15%19%7%
54430
SeeingDay
16%421%29%20%7%
8918
Night
15%427%33%16%2
17709

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
6%11%5%11%9%446%5%6%27%
1463
16th to endDay
7%14%6%10%6%36%5%5%6%27%
1680
February1st to 15thDay
8%12%410%7%45%5%6%7%26%
1656
16th to endDay
311%8%10%8%46%5%5%8%25%
1718
March1st to 15thDay
6%13%5%9%8%35%6%5%7%28%
2138
16th to endDay
9%15%5%7%5%25%5%7%8%26%
2505
April1st to 15thDay
11%12%5%8%7%346%6%8%24%
2629
16th to endDay
14%10%37%6%346%5%8%28%
2693
May1st to 15thDay
10%8%36%6%36%5%5%8%34%
3070
16th to endDay
18%7%35%5%45%45%7%32%
3282
June1st to 15thDay
17%8%36%6%46%5%6%7%26%
3150
16th to endDay
13%6%25%5%45%6%7%8%33%
3346
July1st to 15thDay
11%6%26%6%35%5%7%9%34%
3197
16th to endDay
10%4245%36%6%6%8%40%
3326
August1st to 15thDay
11%6%25%5%35%5%6%9%37%
2902
16th to endDay
9%6%25%5%346%6%9%40%
2899
September1st to 15thDay
16%6%25%5%3445%7%38%
2537
16th to endDay
13%7%25%43446%7%40%
2157
October1st to 15thDay
13%12%38%5%35%45%6%31%
1957
16th to endDay
10%11%46%6%36%35%8%33%
1872
November1st to 15thDay
9%14%6%8%8%35%46%7%24%
1606
16th to endDay
6%12%410%7%45%46%7%30%
1470
December1st to 15thDay
6%14%7%11%8%45%446%25%
1470
16th to endDay
314%5%12%8%45%5%6%7%25%
1568
January1st to 15thNight
7%12%5%11%8%46%5%6%6%24%
3135
16th to endNight
8%13%6%9%7%35%5%5%6%28%
3259
February1st to 15thNight
6%12%5%10%8%5%5%5%5%7%27%
2857
16th to endNight
6%12%5%8%7%5%6%5%6%7%28%
2328
March1st to 15thNight
6%9%47%7%46%5%6%9%31%
2481
16th to endNight
8%14%5%10%7%46%5%6%7%23%
2418
April1st to 15thNight
10%10%48%8%46%6%6%7%25%
1978
16th to endNight
13%11%36%6%245%5%7%32%
1872
May1st to 15thNight
11%10%48%6%36%5%5%7%29%
1539
16th to endNight
17%9%35%5%445%6%7%30%
1533
June1st to 15thNight
19%7%38%6%36%5%7%6%23%
1470
16th to endNight
13%6%36%5%5%5%6%7%8%31%
1268
July1st to 15thNight
11%6%35%6%35%6%6%9%34%
1419
16th to endNight
10%5%25%5%36%6%7%9%36%
1547
August1st to 15thNight
11%5%25%5%35%5%7%10%36%
1638
16th to endNight
11%5%245%346%7%10%37%
2007
September1st to 15thNight
13%5%35%5%2446%6%40%
2079
16th to endNight
12%5%25%43336%8%44%
2157
October1st to 15thNight
13%10%47%6%25%45%7%32%
2330
16th to endNight
9%8%37%6%35%5%6%8%34%
2704
November1st to 15thNight
10%13%5%9%7%35%5%5%7%25%
2896
16th to endNight
8%13%6%9%7%45%5%5%8%26%
3150
December1st to 15thNight
8%12%7%8%8%445%46%28%
3150
16th to endNight
412%6%10%8%5%6%5%5%7%27%
3360

Percentage Cloud Cover SW (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%10%9%45%6%5%7%26%
1463
16th to endDay
7%14%6%9%7%46%5%5%6%27%
1680
February1st to 15thDay
8%12%5%9%7%45%6%5%8%26%
1656
16th to endDay
411%8%10%8%46%6%5%7%25%
1718
March1st to 15thDay
6%12%5%9%7%35%6%6%7%28%
2138
16th to endDay
9%14%5%7%5%35%5%7%8%26%
2506
April1st to 15thDay
11%13%48%7%35%6%6%8%24%
2629
16th to endDay
13%11%36%6%35%5%6%8%29%
2693
May1st to 15thDay
10%8%36%6%36%5%6%7%34%
3070
16th to endDay
17%7%35%5%35%46%7%32%
3282
June1st to 15thDay
17%8%36%6%46%5%6%8%26%
3150
16th to endDay
14%5%25%5%36%6%7%8%34%
3346
July1st to 15thDay
11%7%26%5%35%5%7%9%35%
3197
16th to endDay
10%424435%6%6%8%41%
3326
August1st to 15thDay
12%6%15%5%35%5%6%9%37%
2902
16th to endDay
10%5%25%5%35%5%6%8%41%
2899
September1st to 15thDay
17%6%145%3445%6%39%
2537
16th to endDay
13%7%25%435%45%8%40%
2157
October1st to 15thDay
13%11%38%5%3445%6%32%
1957
16th to endDay
10%11%45%6%4445%7%34%
1872
November1st to 15thDay
9%14%6%9%7%45%5%5%7%23%
1606
16th to endDay
6%11%5%10%7%5%446%7%30%
1470
December1st to 15thDay
6%13%6%11%9%46%446%26%
1470
16th to endDay
412%6%11%8%46%6%5%7%25%
1568
January1st to 15thNight
6%12%5%10%9%46%6%6%7%24%
3135
16th to endNight
7%12%6%9%7%46%5%5%6%28%
3259
February1st to 15thNight
6%12%5%10%8%5%5%5%5%7%27%
2857
16th to endNight
6%11%5%7%8%45%5%6%7%28%
2328
March1st to 15thNight
6%9%37%7%47%5%6%9%31%
2481
16th to endNight
8%13%6%10%7%36%5%5%8%24%
2421
April1st to 15thNight
10%10%48%8%36%6%6%7%25%
1978
16th to endNight
13%10%36%6%335%5%8%32%
1872
May1st to 15thNight
11%10%37%6%45%5%5%7%29%
1539
16th to endNight
17%9%36%435%5%6%7%29%
1533
June1st to 15thNight
18%7%47%7%36%6%7%6%24%
1470
16th to endNight
13%6%35%6%46%6%7%8%31%
1268
July1st to 15thNight
11%6%25%6%35%6%6%9%34%
1419
16th to endNight
10%426%5%36%6%7%9%36%
1547
August1st to 15thNight
12%5%25%6%246%7%9%37%
1638
16th to endNight
11%5%25%5%35%5%7%9%38%
2007
September1st to 15thNight
13%6%25%6%245%5%6%40%
2079
16th to endNight
12%5%25%5%3335%8%44%
2157
October1st to 15thNight
12%11%38%5%3445%6%32%
2330
16th to endNight
9%8%28%6%36%5%6%7%35%
2704
November1st to 15thNight
10%12%6%8%7%46%5%5%7%25%
2896
16th to endNight
8%12%6%9%8%35%5%5%8%26%
3150
December1st to 15thNight
8%13%6%9%7%445%5%6%28%
3150
16th to endNight
411%6%10%8%5%6%5%6%7%27%
3360

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
55%5%15%16%5%
1463
16th to endDay
55%413%16%6%2
1680
February1st to 15thDay
54%5%15%16%7%1
1656
16th to endDay
55%5%15%17%6%
1718
March1st to 15thDay
52%5%15%20%5%
2138
16th to endDay
51%6%16%18%6%
2506
April1st to 15thDay
55%6%14%17%5%
2629
16th to endDay
51%5%14%20%6%1
2693
May1st to 15thDay
46%415%24%8%
3070
16th to endDay
49%415%20%8%
3287
June1st to 15thDay
53%6%18%19%3
3150
16th to endDay
43%7%21%21%5%
3346
July1st to 15thDay
43%6%22%23%3
3038
16th to endDay
38%8%28%22%2
3147
August1st to 15thDay
40%7%28%20%2
2884
16th to endDay
37%6%26%22%6%
2899
September1st to 15thDay
44%420%23%6%1
2537
16th to endDay
41%6%15%26%7%1
2157
October1st to 15thDay
52%416%19%6%
1957
16th to endDay
47%5%14%25%6%
1872
November1st to 15thDay
57%5%14%16%5%
1606
16th to endDay
52%5%17%15%5%1
1470
December1st to 15thDay
60%412%16%5%
1470
16th to endDay
54%5%14%15%9%1
1568
January1st to 15thNight
57%5%16%14%42
3135
16th to endNight
55%412%16%8%2
3259
February1st to 15thNight
55%412%18%7%
2869
16th to endNight
51%5%14%18%9%
2328
March1st to 15thNight
46%5%15%23%8%
2481
16th to endNight
57%5%12%17%6%
2421
April1st to 15thNight
54%7%13%17%6%1
1978
16th to endNight
48%413%22%9%1
1872
May1st to 15thNight
51%5%12%19%10%
1540
16th to endNight
51%5%14%18%8%1
1533
June1st to 15thNight
55%7%16%16%4
1470
16th to endNight
47%7%20%19%4
1268
July1st to 15thNight
42%9%21%21%4
1349
16th to endNight
40%9%23%22%3
1463
August1st to 15thNight
39%8%27%20%3
1631
16th to endNight
39%6%21%26%6%
2007
September1st to 15thNight
41%5%18%24%8%1
2079
16th to endNight
37%417%26%11%2
2157
October1st to 15thNight
51%413%22%8%
2330
16th to endNight
45%5%17%24%6%
2704
November1st to 15thNight
56%5%12%17%6%
2896
16th to endNight
54%6%15%15%5%1
3150
December1st to 15thNight
55%5%13%19%6%
3150
16th to endNight
53%413%20%7%
3360

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%230%32%20%5%
120
16th to endDay
14%7%20%37%11%8%
128
February1st to 15thDay
18%7%19%31%17%6%
125
16th to endDay
12%229%31%17%7%
221
March1st to 15thDay
15%6%27%28%17%4
390
16th to endDay
18%328%26%18%5%
416
April1st to 15thDay
17%6%30%30%12%2
389
16th to endDay
24%7%20%26%16%3
378
May1st to 15thDay
14%6%20%33%19%5%
558
16th to endDay
19%317%29%22%7%
677
June1st to 15thDay
20%5%20%31%17%5%
645
16th to endDay
15%319%28%23%8%
841
July1st to 15thDay
14%217%33%25%6%
672
16th to endDay
13%316%26%27%12%
675
August1st to 15thDay
13%214%28%26%15%
435
16th to endDay
14%6%18%31%21%7%
460
September1st to 15thDay
24%220%25%20%6%
435
16th to endDay
20%7%21%26%16%7%
380
October1st to 15thDay
23%6%25%22%13%7%
248
16th to endDay
17%6%30%26%15%4
192
November1st to 15thDay
23%224%35%10%4
165
16th to endDay
12%430%30%14%7%
120
December1st to 15thDay
10%8%34%21%20%5%
120
16th to endDay
6%5%32%32%14%8%
128
January1st to 15thNight
13%6%34%29%14%1
1050
16th to endNight
14%8%34%30%10%1
1019
February1st to 15thNight
12%7%26%33%18%1
824
16th to endNight
12%425%35%17%4
736
March1st to 15thNight
10%334%32%15%3
840
16th to endNight
14%325%36%17%2
896
April1st to 15thNight
15%6%27%36%13%1
718
16th to endNight
19%423%37%13%1
624
May1st to 15thNight
18%5%20%36%16%2
430
16th to endNight
20%5%19%35%16%2
439
June1st to 15thNight
22%420%34%15%3
420
16th to endNight
16%319%34%23%3
420
July1st to 15thNight
13%214%45%23%1
400
16th to endNight
12%313%39%27%3
440
August1st to 15thNight
15%113%32%29%7%
414
16th to endNight
13%218%37%25%1
669
September1st to 15thNight
17%217%38%22%2
756
16th to endNight
14%325%35%17%3
780
October1st to 15thNight
19%425%32%16%1
780
16th to endNight
13%5%31%35%12%1
832
November1st to 15thNight
17%6%33%31%9%2
1002
16th to endNight
15%5%36%27%12%1
1050
December1st to 15thNight
15%7%32%29%13%2
1050
16th to endNight
10%433%31%16%2
1120
Page generated at 2019-09-17 19:12:18. Version ac04

Copyright 2019 A. Danko


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