Waskesiu Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Waskesiu Lake clear sky chart from 2005-11-06 to 2024-02-05.

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%
24077
10%
80886
5%
24003
36%
24003
16%
57013

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
21%
937
7%
4990
4%
926
29%
926
6%
3969
January11th to 20thNight
19%
945
9%
4692
4%
929
27%
929
7%
3592
January21st to endNight
16%
1035
7%
5122
3%
1023
23%
1023
6%
3638
February1st to 10thNight
24%
923
12%
2583
4%
923
32%
923
16%
1930
February11th to 20thNight
29%
714
14%
2285
10%
712
35%
712
14%
1690
February21st to endNight
36%
592
17%
1906
10%
592
45%
592
19%
1312
March1st to 10thNight
34%
720
14%
2160
9%
720
39%
720
18%
1582
March11th to 20thNight
28%
720
17%
2030
7%
720
37%
720
19%
1451
March21st to endNight
35%
662
16%
2048
11%
662
42%
662
20%
1432
April1st to 10thNight
34%
540
14%
1800
9%
540
42%
540
21%
1177
April11th to 20thNight
33%
533
14%
1632
10%
533
38%
533
21%
1123
April21st to endNight
32%
540
13%
1440
7%
540
36%
540
21%
1036
May1st to 10thNight
38%
540
12%
1440
5%
540
42%
540
29%
946
May11th to 20thNight
42%
489
5%
1354
4%
489
44%
489
31%
854
May21st to endNight
43%
388
0%
1164
0%
388
43%
388
21%
810
June1st to 10thNight
39%
360
0%
1080
0%
360
39%
360
24%
718
June11th to 20thNight
38%
360
0%
1080
0%
360
38%
360
16%
777
June21st to endNight
45%
360
0%
1080
0%
360
45%
360
23%
741
July1st to 10thNight
52%
350
0%
1050
0%
350
52%
350
28%
665
July11th to 20thNight
41%
348
0%
1108
0%
348
41%
348
23%
714
July21st to endNight
54%
394
4%
1302
4%
372
56%
372
29%
745
August1st to 10thNight
54%
535
7%
1423
4%
533
57%
533
33%
878
August11th to 20thNight
49%
534
12%
1424
7%
534
53%
534
31%
902
August21st to endNight
44%
594
15%
1794
10%
594
50%
594
30%
1075
September1st to 10thNight
41%
540
14%
1800
12%
540
46%
540
25%
1105
September11th to 20thNight
42%
540
17%
1800
13%
540
50%
540
24%
1126
September21st to endNight
37%
637
19%
2041
13%
637
47%
637
25%
1254
October1st to 10thNight
30%
720
16%
2160
9%
720
37%
720
18%
1538
October11th to 20thNight
28%
778
14%
2218
6%
778
35%
778
19%
1573
October21st to endNight
20%
990
11%
2654
2%
990
27%
990
13%
2071
November1st to 10thNight
18%
925
10%
2590
4%
925
22%
925
10%
2158
November11th to 20thNight
19%
950
9%
2755
3%
950
25%
950
9%
2280
November21st to endNight
14%
950
8%
2902
1%
950
22%
950
10%
2286
December1st to 10thNight
26%
950
9%
3040
3%
950
33%
950
12%
2308
December11th to 20thNight
15%
950
9%
3707
3%
949
23%
949
8%
2813
December21st to endNight
26%
1034
9%
5232
7%
1026
33%
1026
11%
2744

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%48%7%46%5%6%7%32%
77327
Night
9%9%49%8%46%6%6%7%32%
81476
TransparencyDay
50%8%14%20%8%1
77018
Night
50%7%13%20%8%1
81366
SeeingDay
16%15%33%25%10%2
14676
Night
14%11%35%28%10%1
24119

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 10thDay
6%13%8%17%14%5%7%45%6%17%
1927
11th to 20thDay
39%5%10%16%11%10%6%5%8%18%
2199
21st to endDay
5%12%5%14%11%46%45%6%28%
2504
February1st to 10thDay
6%8%5%10%9%48%10%9%9%21%
1476
11th to 20thDay
412%49%9%6%7%7%7%8%29%
1575
21st to endDay
49%7%13%9%5%6%5%6%8%28%
1350
March1st to 10thDay
8%10%5%9%8%5%6%7%6%9%27%
1800
11th to 20thDay
8%10%5%9%7%5%5%5%5%7%33%
1928
21st to endDay
8%14%49%8%45%5%5%7%32%
2308
April1st to 10thDay
8%10%47%6%45%5%5%8%37%
2160
11th to 20thDay
11%10%48%9%45%6%7%8%29%
2277
21st to endDay
12%11%47%8%36%6%5%8%31%
2520
May1st to 10thDay
11%8%36%6%35%5%6%8%39%
2520
11th to 20thDay
10%7%26%5%46%5%6%7%41%
2538
21st to endDay
19%7%35%5%35%5%5%8%34%
3111
June1st to 10thDay
17%6%47%6%46%7%6%8%29%
2880
11th to 20thDay
21%8%48%7%45%5%6%7%25%
2880
21st to endDay
17%6%35%6%46%5%6%7%33%
2880
July1st to 10thDay
12%5%26%5%46%5%7%9%38%
2880
11th to 20thDay
12%6%35%6%46%6%6%8%39%
2813
21st to endDay
12%5%26%6%46%5%6%9%39%
2938
August1st to 10thDay
11%436%6%46%6%7%9%38%
2508
11th to 20thDay
12%6%25%5%45%6%6%8%41%
2477
21st to endDay
15%6%36%5%3446%7%42%
2559
September1st to 10thDay
13%7%36%6%345%6%7%40%
2160
11th to 20thDay
15%9%37%6%35%5%5%7%36%
2160
21st to endDay
11%7%36%6%35%45%7%42%
1918
October1st to 10thDay
15%15%35%5%25%45%7%35%
1800
11th to 20thDay
12%11%5%7%5%34448%37%
1724
21st to endDay
14%14%412%8%34445%27%
1702
November1st to 10thDay
16%17%7%12%8%5%4445%19%
1488
11th to 20thDay
12%14%7%13%13%46%445%20%
1425
21st to endDay
9%13%6%15%10%46%5%6%5%22%
1273
December1st to 10thDay
411%49%14%5%7%8%5%6%26%
1140
11th to 20thDay
8%14%6%13%12%5%6%6%6%6%19%
1439
21st to endDay
47%5%6%7%6%7%5%47%43%
2090
January1st to 10thNight
412%7%17%12%6%7%6%5%5%19%
5014
11th to 20thNight
48%5%11%13%9%11%9%8%7%16%
4699
21st to endNight
6%11%5%11%12%46%6%5%7%27%
5152
February1st to 10thNight
6%9%410%9%6%7%7%7%9%25%
2583
11th to 20thNight
410%5%9%9%5%8%8%6%8%28%
2284
21st to endNight
5%7%49%9%5%6%7%7%7%33%
1906
March1st to 10thNight
8%9%5%9%8%5%7%5%6%7%31%
2160
11th to 20thNight
8%10%5%8%7%46%5%6%9%32%
2030
21st to endNight
8%11%48%7%45%6%6%6%35%
2048
April1st to 10thNight
7%7%39%7%5%6%7%6%6%37%
1800
11th to 20thNight
11%11%5%9%6%3446%6%35%
1632
21st to endNight
12%10%48%7%45%6%6%7%33%
1440
May1st to 10thNight
12%6%36%5%35%5%6%8%42%
1440
11th to 20thNight
9%5%35%436%46%10%45%
1354
21st to endNight
20%6%24446%6%7%7%35%
1164
June1st to 10thNight
14%5%36%6%45%5%6%10%37%
1080
11th to 20thNight
19%7%35%5%46%6%6%8%30%
1080
21st to endNight
14%6%38%6%45%45%8%38%
1080
July1st to 10thNight
9%425%5%35%6%8%10%43%
1080
11th to 20thNight
14%5%26%436%5%6%8%42%
1144
21st to endNight
8%4235%3446%10%49%
1379
August1st to 10thNight
8%3145%35%5%7%9%48%
1430
11th to 20thNight
11%426%5%245%6%9%47%
1424
21st to endNight
13%5%1443446%8%49%
1794
September1st to 10thNight
13%5%25%5%345%6%8%45%
1800
11th to 20thNight
14%5%25%6%4446%6%44%
1800
21st to endNight
9%5%25%5%35%5%7%9%44%
2041
October1st to 10thNight
17%10%46%6%35%5%5%6%34%
2160
11th to 20thNight
10%11%47%7%3445%6%36%
2218
21st to endNight
11%15%6%12%7%44445%27%
2654
November1st to 10thNight
16%18%6%12%7%345%5%5%18%
2590
11th to 20thNight
9%13%6%13%13%5%7%45%5%19%
2755
21st to endNight
7%12%7%15%9%45%5%5%6%24%
2902
December1st to 10thNight
5%8%5%12%10%6%8%7%7%8%25%
3040
11th to 20thNight
8%12%6%13%9%5%6%6%7%8%20%
3753
21st to endNight
47%37%7%45%5%6%7%46%
5566

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
70%410%11%4
1927
11th to 20thDay
65%6%9%16%41
2220
21st to endDay
57%6%13%18%6%
2504
February1st to 10thDay
53%9%13%14%10%
1476
11th to 20thDay
50%7%12%22%9%
1584
21st to endDay
56%5%11%15%11%1
1350
March1st to 10thDay
53%7%12%22%6%
1800
11th to 20thDay
51%7%12%20%10%1
1929
21st to endDay
52%7%10%23%8%
2308
April1st to 10thDay
44%8%15%21%12%1
2160
11th to 20thDay
52%7%14%18%8%1
2277
21st to endDay
50%8%12%20%9%1
2520
May1st to 10thDay
43%6%10%25%15%1
2520
11th to 20thDay
40%8%11%25%14%2
2542
21st to endDay
47%8%12%20%11%1
3112
June1st to 10thDay
50%9%13%17%9%1
2880
11th to 20thDay
58%9%10%16%7%
2880
21st to endDay
49%9%15%20%7%1
2880
July1st to 10thDay
40%10%18%25%6%
2801
11th to 20thDay
41%11%18%26%4
2726
21st to endDay
40%12%21%23%4
2775
August1st to 10thDay
38%12%21%25%3
2491
11th to 20thDay
39%10%22%24%5%
2477
21st to endDay
42%8%20%26%4
2559
September1st to 10thDay
42%9%17%21%9%1
2160
11th to 20thDay
47%7%17%25%3
2160
21st to endDay
42%7%16%25%10%1
1918
October1st to 10thDay
50%7%14%22%7%
1800
11th to 20thDay
48%5%15%24%7%1
1724
21st to endDay
59%8%12%16%6%
1702
November1st to 10thDay
69%6%10%11%4
1488
11th to 20thDay
69%6%10%12%3
1425
21st to endDay
64%7%13%12%5%
1273
December1st to 10thDay
55%11%9%17%7%1
1140
11th to 20thDay
65%6%12%12%5%
1440
21st to endDay
42%5%12%17%21%3
2090
January1st to 10thNight
66%6%9%14%5%
5014
11th to 20thNight
62%6%14%13%5%
4740
21st to endNight
58%7%14%15%6%
5152
February1st to 10thNight
52%8%14%16%10%
2583
11th to 20thNight
53%9%12%18%8%
2285
21st to endNight
47%7%12%21%13%
1906
March1st to 10thNight
52%7%10%23%7%1
2160
11th to 20thNight
49%7%12%21%10%1
2030
21st to endNight
48%7%11%22%11%1
2048
April1st to 10thNight
44%6%14%21%13%2
1800
11th to 20thNight
48%5%11%19%14%3
1632
21st to endNight
49%6%11%22%11%1
1440
May1st to 10thNight
39%6%10%28%15%2
1440
11th to 20thNight
35%7%11%25%19%3
1354
21st to endNight
45%8%12%24%11%
1164
June1st to 10thNight
41%9%14%24%10%1
1080
11th to 20thNight
48%10%15%20%6%1
1080
21st to endNight
44%9%15%22%10%1
1080
July1st to 10thNight
32%13%16%29%9%
1050
11th to 20thNight
39%8%21%28%3
1108
21st to endNight
30%10%25%30%5%
1302
August1st to 10thNight
30%9%26%29%6%
1423
11th to 20thNight
34%9%24%28%5%
1424
21st to endNight
33%7%21%32%7%
1794
September1st to 10thNight
36%9%16%27%9%2
1800
11th to 20thNight
39%7%16%29%9%
1800
21st to endNight
35%9%16%27%12%1
2041
October1st to 10thNight
51%6%12%24%6%
2160
11th to 20thNight
49%7%13%22%9%
2218
21st to endNight
59%6%12%17%6%
2654
November1st to 10thNight
67%7%9%13%4
2590
11th to 20thNight
68%6%10%12%4
2755
21st to endNight
61%8%13%15%4
2902
December1st to 10thNight
57%8%12%17%6%1
3040
11th to 20thNight
60%7%13%14%6%
3751
21st to endNight
37%6%11%27%16%4
5566

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
13%16%40%20%9%3
180
11th to 20thDay
10%14%48%21%6%1
180
21st to endDay
13%17%38%25%7%
216
February1st to 10thDay
8%20%40%23%7%3
252
11th to 20thDay
10%16%38%28%8%
240
21st to endDay
9%15%40%26%9%2
198
March1st to 10thDay
14%15%35%28%8%1
240
11th to 20thDay
11%20%38%23%6%2
369
21st to endDay
13%21%38%21%7%1
462
April1st to 10thDay
15%22%36%20%5%2
420
11th to 20thDay
18%18%36%18%8%2
450
21st to endDay
19%14%35%24%7%1
600
May1st to 10thDay
15%15%30%29%10%2
603
11th to 20thDay
13%15%30%26%13%2
625
21st to endDay
19%13%27%28%11%3
679
June1st to 10thDay
18%16%30%24%8%3
630
11th to 20thDay
24%16%28%20%9%2
630
21st to endDay
18%11%27%25%15%4
630
July1st to 10thDay
14%11%31%28%14%2
621
11th to 20thDay
12%13%32%25%15%3
618
21st to endDay
11%10%29%30%16%4
684
August1st to 10thDay
13%10%27%30%16%5%
626
11th to 20thDay
15%9%29%26%16%4
615
21st to endDay
18%11%33%27%10%2
524
September1st to 10thDay
20%19%33%21%7%
450
11th to 20thDay
20%12%35%26%6%1
450
21st to endDay
16%15%31%27%8%3
306
October1st to 10thDay
16%17%33%25%7%2
270
11th to 20thDay
21%19%30%21%7%2
270
21st to endDay
22%17%30%20%11%1
297
November1st to 10thDay
23%14%36%19%8%1
270
11th to 20thDay
17%19%44%19%1
270
21st to endDay
18%18%43%15%5%1
243
December1st to 10thDay
7%19%35%26%10%3
180
11th to 20thDay
13%19%41%24%3
180
21st to endDay
9%9%42%25%11%4
198
January1st to 10thNight
13%15%38%26%8%
950
11th to 20thNight
11%16%42%23%6%1
950
21st to endNight
15%17%39%22%5%1
1045
February1st to 10thNight
11%12%41%26%9%1
923
11th to 20thNight
10%12%38%27%11%3
716
21st to endNight
8%9%36%34%11%2
592
March1st to 10thNight
12%9%36%32%10%1
720
11th to 20thNight
12%13%40%24%10%1
720
21st to endNight
14%9%34%28%12%2
662
April1st to 10thNight
10%10%36%33%10%1
540
11th to 20thNight
18%11%31%29%11%1
533
21st to endNight
17%11%31%31%9%1
540
May1st to 10thNight
14%10%32%32%11%
540
11th to 20thNight
11%8%33%33%14%1
489
21st to endNight
23%5%23%32%15%2
389
June1st to 10thNight
16%9%29%33%12%1
360
11th to 20thNight
23%9%24%28%15%2
360
21st to endNight
16%6%25%34%17%2
360
July1st to 10thNight
10%5%25%43%16%
350
11th to 20thNight
17%8%26%28%18%3
348
21st to endNight
8%7%26%35%21%3
394
August1st to 10thNight
10%6%24%34%22%4
535
11th to 20thNight
13%6%25%31%23%3
534
21st to endNight
16%7%27%31%18%1
594
September1st to 10thNight
15%9%30%29%16%1
540
11th to 20thNight
19%6%28%36%11%
540
21st to endNight
12%10%36%32%9%
637
October1st to 10thNight
22%9%32%26%8%2
720
11th to 20thNight
16%10%37%25%11%1
778
21st to endNight
20%16%33%24%7%1
990
November1st to 10thNight
24%11%35%22%6%2
925
11th to 20thNight
15%15%37%25%6%1
950
21st to endNight
14%18%43%20%5%1
950
December1st to 10thNight
10%13%37%29%9%2
950
11th to 20thNight
13%13%42%24%7%1
950
21st to endNight
11%11%38%28%10%2
1045
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