Burns Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Burns 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
36%
23097
8%
81045
6%
22994
40%
22994
13%
61055

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
25%
836
7%
4704
4%
816
30%
816
4%
4011
January11th to 20thNight
27%
834
13%
4632
4%
820
31%
820
5%
3246
January21st to endNight
30%
924
5%
5214
6%
902
34%
902
4%
4582
February1st to 10thNight
30%
810
10%
2594
7%
810
34%
810
11%
2032
February11th to 20thNight
34%
700
13%
2274
10%
700
39%
700
14%
1698
February21st to endNight
38%
592
14%
1924
11%
592
43%
592
15%
1396
March1st to 10thNight
39%
720
13%
2162
10%
720
43%
720
17%
1562
March11th to 20thNight
35%
720
11%
1980
7%
720
38%
720
15%
1517
March21st to endNight
41%
792
13%
2178
8%
792
44%
792
17%
1640
April1st to 10thNight
40%
608
10%
1689
5%
608
44%
608
18%
1254
April11th to 20thNight
39%
533
11%
1601
9%
533
41%
533
16%
1210
April21st to endNight
37%
462
9%
1542
8%
462
41%
462
17%
1079
May1st to 10thNight
37%
360
5%
1369
6%
360
38%
360
14%
972
May11th to 20thNight
42%
354
3%
1239
2%
354
42%
354
16%
867
May21st to endNight
36%
388
0%
1358
0%
388
36%
388
15%
963
June1st to 10thNight
39%
360
0%
1116
0%
360
39%
360
17%
800
June11th to 20thNight
37%
360
0%
1080
0%
360
37%
360
19%
768
June21st to endNight
46%
360
0%
1080
0%
360
46%
360
24%
721
July1st to 10thNight
42%
350
0%
1200
0%
350
42%
350
17%
811
July11th to 20thNight
45%
348
0%
1218
0%
348
45%
348
21%
782
July21st to endNight
53%
394
3%
1302
2%
372
53%
372
27%
773
August1st to 10thNight
61%
358
10%
1246
9%
356
63%
356
28%
719
August11th to 20thNight
52%
504
12%
1568
11%
504
55%
504
31%
944
August21st to endNight
48%
594
12%
1782
9%
594
51%
594
20%
1242
September1st to 10thNight
47%
625
10%
1705
7%
625
48%
625
24%
1197
September11th to 20thNight
54%
720
16%
1901
9%
720
56%
720
25%
1324
September21st to endNight
35%
720
12%
1992
6%
720
39%
720
16%
1499
October1st to 10thNight
41%
720
10%
2160
8%
720
44%
720
17%
1570
October11th to 20thNight
35%
720
9%
2218
7%
720
40%
720
14%
1702
October21st to endNight
34%
792
10%
2690
6%
792
41%
792
14%
1973
November1st to 10thNight
30%
740
9%
2590
7%
740
34%
740
9%
2022
November11th to 20thNight
27%
795
7%
2733
5%
795
31%
795
9%
2190
November21st to endNight
27%
853
7%
2853
4%
853
32%
853
10%
2291
December1st to 10thNight
34%
1040
10%
3040
6%
1040
37%
1040
12%
2414
December11th to 20thNight
31%
1040
6%
3746
4%
1039
34%
1039
8%
3156
December21st to endNight
26%
1071
6%
5365
6%
1049
30%
1049
6%
4128

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
12%12%5%9%8%46%5%6%7%27%
77407
Night
12%14%5%9%8%46%6%6%7%25%
81393
TransparencyDay
55%7%14%17%6%1
77107
Night
57%7%13%16%6%1
81273
SeeingDay
18%12%25%24%15%5%
15270
Night
18%8%23%30%17%2
23151

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
8%19%8%15%13%5%7%6%5%410%
2219
11th to 20thDay
12%14%6%9%7%45%46%7%26%
2199
21st to endDay
17%23%7%12%9%45%445%11%
2442
February1st to 10thDay
15%14%6%10%10%35%45%5%24%
1457
11th to 20thDay
8%14%6%10%6%46%5%6%8%27%
1575
21st to endDay
6%14%6%10%9%5%7%5%45%29%
1332
March1st to 10thDay
8%13%6%11%9%45%6%6%5%26%
1794
11th to 20thDay
8%14%6%9%8%5%7%7%6%8%23%
1980
21st to endDay
8%15%7%11%6%45%5%5%6%26%
2178
April1st to 10thDay
10%15%7%11%8%45%5%5%6%23%
2268
11th to 20thDay
10%15%6%10%9%45%5%5%6%24%
2308
21st to endDay
14%14%5%10%7%35%45%8%25%
2417
May1st to 10thDay
12%15%5%10%7%45%45%6%26%
2587
11th to 20thDay
12%10%48%7%5%6%6%5%7%29%
2656
21st to endDay
15%10%49%8%46%5%6%7%27%
2917
June1st to 10thDay
14%8%49%8%5%7%5%6%7%28%
2839
11th to 20thDay
14%9%5%9%8%46%6%6%8%27%
2880
21st to endDay
11%7%48%7%5%5%6%6%7%34%
2880
July1st to 10thDay
12%6%47%6%5%6%6%7%8%33%
2721
11th to 20thDay
14%7%37%5%35%6%6%8%36%
2700
21st to endDay
11%5%35%6%46%6%7%8%39%
2938
August1st to 10thDay
9%6%35%6%35%5%5%8%45%
2686
11th to 20thDay
10%435%6%35%5%6%8%45%
2331
21st to endDay
13%9%37%8%5%6%6%6%8%28%
2574
September1st to 10thDay
13%7%38%6%46%6%6%8%32%
2255
11th to 20thDay
12%9%38%7%46%6%6%8%32%
2057
21st to endDay
16%11%49%8%46%6%5%6%25%
1968
October1st to 10thDay
14%12%49%8%45%5%5%7%27%
1800
11th to 20thDay
16%12%5%10%7%46%6%7%7%20%
1740
21st to endDay
18%13%5%9%7%35%45%6%25%
1666
November1st to 10thDay
18%15%5%9%6%5%5%5%6%7%21%
1488
11th to 20thDay
13%19%6%8%8%46%6%6%6%17%
1444
21st to endDay
13%15%7%11%9%5%6%5%5%8%17%
1307
December1st to 10thDay
9%14%410%14%5%7%6%6%6%19%
1140
11th to 20thDay
16%17%6%11%10%47%5%6%5%13%
1442
21st to endDay
7%16%6%11%10%6%7%6%6%6%19%
2222
January1st to 10thNight
10%20%8%14%11%5%7%6%5%5%10%
4726
11th to 20thNight
10%15%6%10%8%45%5%5%7%25%
4699
21st to endNight
16%21%6%13%9%5%6%5%4411%
5214
February1st to 10thNight
14%16%6%10%7%45%5%5%5%23%
2594
11th to 20thNight
9%15%5%9%7%45%6%5%7%27%
2272
21st to endNight
6%12%6%10%7%46%6%7%5%29%
1924
March1st to 10thNight
8%13%6%9%7%45%5%6%6%30%
2162
11th to 20thNight
8%13%6%9%8%5%7%7%6%5%26%
1979
21st to endNight
8%14%5%9%8%46%6%6%6%29%
2178
April1st to 10thNight
7%13%5%9%7%5%5%6%7%7%29%
1689
11th to 20thNight
10%13%5%9%9%46%6%6%6%24%
1601
21st to endNight
11%12%5%8%8%35%6%6%8%29%
1542
May1st to 10thNight
13%12%47%8%45%5%6%8%27%
1369
11th to 20thNight
13%8%38%6%46%5%7%10%29%
1239
21st to endNight
15%9%38%6%45%6%7%7%29%
1358
June1st to 10thNight
12%8%48%6%5%6%7%6%8%31%
1116
11th to 20thNight
14%8%5%6%7%45%5%7%8%32%
1080
21st to endNight
11%5%35%6%47%7%6%10%37%
1080
July1st to 10thNight
12%6%37%7%46%6%6%6%37%
1235
11th to 20thNight
13%5%25%6%36%7%6%6%41%
1260
21st to endNight
8%6%35%5%26%6%8%10%42%
1379
August1st to 10thNight
7%425%6%445%6%9%49%
1253
11th to 20thNight
8%425%6%34448%50%
1568
21st to endNight
13%8%46%7%35%7%6%7%34%
1782
September1st to 10thNight
15%9%36%5%3445%7%39%
1705
11th to 20thNight
10%8%37%6%45%6%6%7%38%
1901
21st to endNight
17%10%46%7%46%6%6%6%29%
1992
October1st to 10thNight
16%10%48%5%45%5%46%33%
2160
11th to 20thNight
19%11%48%7%45%5%6%6%24%
2218
21st to endNight
17%12%46%7%45%5%5%7%28%
2690
November1st to 10thNight
14%15%6%8%7%5%5%6%6%7%20%
2590
11th to 20thNight
11%17%7%10%7%46%6%6%7%19%
2733
21st to endNight
11%16%6%11%8%45%5%6%8%19%
2853
December1st to 10thNight
9%12%6%13%11%5%6%5%6%7%22%
3040
11th to 20thNight
13%20%7%11%7%5%6%5%5%5%16%
3750
21st to endNight
8%18%7%11%8%5%6%6%6%6%19%
5462

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
72%10%8%6%5%
2219
11th to 20thDay
59%5%14%6%10%6%
2220
21st to endDay
75%6%9%7%3
2442
February1st to 10thDay
63%6%10%10%11%1
1457
11th to 20thDay
56%8%14%17%5%1
1584
21st to endDay
58%5%11%15%8%2
1332
March1st to 10thDay
56%7%11%17%9%1
1794
11th to 20thDay
56%7%14%17%6%
1980
21st to endDay
58%6%13%18%4
2178
April1st to 10thDay
62%5%11%16%5%
2268
11th to 20thDay
61%6%9%16%8%
2308
21st to endDay
58%5%12%15%9%
2417
May1st to 10thDay
59%5%12%18%7%
2587
11th to 20thDay
53%7%11%20%8%1
2659
21st to endDay
55%5%12%18%9%
2918
June1st to 10thDay
54%7%10%22%7%1
2839
11th to 20thDay
55%7%13%19%6%
2880
21st to endDay
48%8%14%25%5%
2880
July1st to 10thDay
47%8%14%24%6%1
2647
11th to 20thDay
45%7%19%25%4
2619
21st to endDay
39%9%21%24%7%
2775
August1st to 10thDay
36%8%21%27%7%
2668
11th to 20thDay
35%9%19%30%6%
2331
21st to endDay
52%9%16%18%5%
2574
September1st to 10thDay
48%8%21%19%4
2255
11th to 20thDay
48%8%15%25%4
2057
21st to endDay
57%9%12%17%4
1968
October1st to 10thDay
57%7%15%17%4
1800
11th to 20thDay
61%9%16%12%2
1740
21st to endDay
59%6%15%15%4
1666
November1st to 10thDay
63%8%11%14%4
1488
11th to 20thDay
67%8%11%11%3
1444
21st to endDay
67%8%12%10%4
1307
December1st to 10thDay
64%8%13%11%5%
1140
11th to 20thDay
70%8%10%8%4
1444
21st to endDay
61%9%11%11%6%1
2222
January1st to 10thNight
71%9%8%9%2
4726
11th to 20thNight
59%5%12%6%10%7%
4740
21st to endNight
76%8%6%7%3
5214
February1st to 10thNight
62%6%11%10%9%1
2594
11th to 20thNight
56%7%14%15%8%
2274
21st to endNight
55%5%11%19%9%1
1924
March1st to 10thNight
53%5%14%17%9%1
2162
11th to 20thNight
57%7%11%18%7%
1980
21st to endNight
54%7%12%21%6%
2178
April1st to 10thNight
53%6%14%19%8%
1689
11th to 20thNight
56%6%11%20%6%
1601
21st to endNight
50%7%13%23%7%
1542
May1st to 10thNight
52%9%16%16%7%
1369
11th to 20thNight
49%9%13%20%7%1
1239
21st to endNight
52%7%14%20%6%
1358
June1st to 10thNight
51%8%12%21%8%1
1116
11th to 20thNight
49%7%13%25%6%
1080
21st to endNight
40%10%19%26%5%
1080
July1st to 10thNight
47%8%16%20%8%1
1200
11th to 20thNight
42%7%21%24%6%
1218
21st to endNight
34%9%25%24%8%
1302
August1st to 10thNight
32%9%22%27%10%
1246
11th to 20thNight
34%7%22%28%8%
1568
21st to endNight
46%9%18%23%3
1782
September1st to 10thNight
46%6%21%21%5%
1705
11th to 20thNight
44%8%13%28%7%1
1901
21st to endNight
54%8%14%20%5%
1992
October1st to 10thNight
53%7%16%19%6%
2160
11th to 20thNight
58%7%17%14%4
2218
21st to endNight
54%7%16%18%5%
2690
November1st to 10thNight
61%9%12%14%5%
2590
11th to 20thNight
63%8%13%11%4
2733
21st to endNight
64%8%11%12%5%
2853
December1st to 10thNight
61%7%13%13%5%
3040
11th to 20thNight
68%8%10%10%4
3747
21st to endNight
62%9%11%12%6%
5462

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
19%9%21%31%14%6%
180
11th to 20thDay
22%12%23%25%14%3
180
21st to endDay
25%5%27%25%13%6%
198
February1st to 10thDay
24%16%23%26%7%5%
310
11th to 20thDay
17%16%29%25%10%3
335
21st to endDay
18%17%29%20%11%5%
280
March1st to 10thDay
16%17%27%22%14%4
366
11th to 20thDay
17%14%29%23%15%3
420
21st to endDay
21%14%27%19%16%3
462
April1st to 10thDay
21%15%30%21%10%4
420
11th to 20thDay
17%15%25%22%11%9%
412
21st to endDay
21%15%28%20%10%5%
420
May1st to 10thDay
18%16%27%23%12%3
490
11th to 20thDay
18%12%24%21%19%6%
625
21st to endDay
19%12%25%25%16%4
680
June1st to 10thDay
19%12%25%24%16%3
769
11th to 20thDay
16%11%27%28%14%3
810
21st to endDay
13%8%27%29%18%6%
810
July1st to 10thDay
15%9%23%27%19%6%
642
11th to 20thDay
16%9%27%26%19%4
618
21st to endDay
11%11%25%29%15%8%
684
August1st to 10thDay
12%9%21%26%21%11%
626
11th to 20thDay
12%10%24%26%20%8%
441
21st to endDay
19%12%27%22%13%7%
495
September1st to 10thDay
19%13%22%24%19%4
450
11th to 20thDay
18%10%18%24%21%9%
450
21st to endDay
22%15%31%16%13%3
450
October1st to 10thDay
23%14%21%19%16%7%
450
11th to 20thDay
24%14%26%21%11%4
419
21st to endDay
25%13%28%19%14%2
280
November1st to 10thDay
24%17%19%22%12%5%
180
11th to 20thDay
27%14%21%20%12%7%
180
21st to endDay
26%11%24%17%13%8%
180
December1st to 10thDay
14%422%34%20%6%
180
11th to 20thDay
11%9%24%34%19%3
180
21st to endDay
19%9%21%28%17%6%
198
January1st to 10thNight
23%9%24%30%12%2
850
11th to 20thNight
20%9%24%31%15%2
850
21st to endNight
21%11%20%31%15%2
935
February1st to 10thNight
24%11%23%28%12%1
810
11th to 20thNight
17%6%26%36%13%2
704
21st to endNight
13%11%23%34%16%3
592
March1st to 10thNight
17%12%21%30%18%2
720
11th to 20thNight
14%11%27%30%16%2
720
21st to endNight
15%10%20%28%23%4
792
April1st to 10thNight
13%7%26%28%23%3
608
11th to 20thNight
17%8%25%26%21%3
533
21st to endNight
16%12%25%32%14%2
462
May1st to 10thNight
20%8%25%30%16%1
360
11th to 20thNight
15%7%28%28%21%1
354
21st to endNight
19%9%24%28%19%1
389
June1st to 10thNight
15%7%25%34%18%1
360
11th to 20thNight
17%7%31%36%9%
360
21st to endNight
13%6%28%33%19%2
360
July1st to 10thNight
14%7%27%28%22%2
350
11th to 20thNight
15%5%26%31%20%3
348
21st to endNight
10%5%26%37%18%4
394
August1st to 10thNight
8%319%36%28%7%
358
11th to 20thNight
11%326%31%26%4
504
21st to endNight
17%5%20%34%21%3
594
September1st to 10thNight
20%5%19%28%26%1
625
11th to 20thNight
13%7%18%28%29%6%
720
21st to endNight
22%10%23%26%17%2
720
October1st to 10thNight
23%7%18%29%19%3
720
11th to 20thNight
26%8%21%27%17%2
720
21st to endNight
26%8%23%30%13%
792
November1st to 10thNight
22%11%25%26%13%3
740
11th to 20thNight
21%12%27%28%11%2
795
21st to endNight
20%9%29%27%13%3
853
December1st to 10thNight
15%7%21%35%18%3
1040
11th to 20thNight
18%9%23%34%15%2
1040
21st to endNight
17%7%25%34%15%2
1079
Page generated at 2024-02-02 02:20:27. Version ac07

Copyright 2024 Attilla Danko


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