Baker Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Baker 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
46%
23179
6%
82389
5%
23111
47%
23111
12%
62160

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
53%
1092
7%
5942
6%
1086
55%
1086
8%
4056
January11th to 20thNight
49%
1008
5%
5630
8%
995
52%
995
8%
4297
January21st to endNight
48%
1031
8%
5788
10%
1023
53%
1023
12%
3458
February1st to 10thNight
62%
923
7%
2852
6%
923
63%
923
16%
2135
February11th to 20thNight
62%
874
10%
2575
8%
874
63%
874
21%
1829
February21st to endNight
57%
740
13%
1963
8%
740
58%
740
21%
1450
March1st to 10thNight
55%
880
11%
2320
8%
880
57%
880
22%
1681
March11th to 20thNight
60%
558
13%
1998
15%
558
64%
558
18%
1362
March21st to endNight
57%
594
12%
2081
12%
594
59%
594
20%
1412
April1st to 10thNight
52%
540
7%
1620
5%
540
53%
540
20%
1154
April11th to 20thNight
53%
533
2%
1449
2%
533
54%
533
20%
1081
April21st to endNight
51%
540
0%
1260
0%
540
51%
540
24%
957
May1st to 10thNight
44%
319
0%
1039
0%
319
44%
319
17%
768
May11th to 20thNight
40%
177
0%
877
0%
177
40%
177
8%
653
May21st to endNight
32%
194
0%
683
0%
194
32%
194
11%
512
June1st to 10thNight
46%
180
0%
540
0%
180
46%
180
18%
395
June11th to 20thNight
48%
180
0%
540
0%
180
48%
180
20%
379
June21st to endNight
51%
180
0%
540
0%
180
51%
180
24%
357
July1st to 10thNight
57%
175
0%
525
0%
175
57%
175
28%
339
July11th to 20thNight
62%
174
0%
533
0%
174
62%
174
29%
331
July21st to endNight
56%
197
0%
930
0%
186
55%
186
16%
556
August1st to 10thNight
64%
257
0%
968
0%
256
64%
256
24%
579
August11th to 20thNight
48%
534
0%
1246
0%
534
48%
534
22%
951
August21st to endNight
47%
594
1%
1553
1%
594
47%
594
19%
1185
September1st to 10thNight
41%
540
3%
1620
2%
540
41%
540
14%
1255
September11th to 20thNight
35%
540
3%
1833
3%
540
35%
540
8%
1534
September21st to endNight
27%
580
5%
2020
4%
580
30%
580
8%
1673
October1st to 10thNight
24%
761
5%
2201
4%
761
26%
761
7%
1924
October11th to 20thNight
24%
900
4%
2452
2%
900
25%
900
6%
2213
October21st to endNight
20%
990
1%
2846
1%
990
20%
990
2%
2711
November1st to 10thNight
33%
925
3%
2960
2%
925
33%
925
5%
2620
November11th to 20thNight
36%
958
7%
3174
4%
958
41%
958
10%
2554
November21st to endNight
43%
1040
6%
3420
5%
1040
46%
1040
9%
2807
December1st to 10thNight
51%
1109
8%
3567
7%
1109
53%
1109
11%
2857
December11th to 20thNight
51%
1129
11%
4349
9%
1129
53%
1129
12%
3134
December21st to endNight
44%
1233
3%
6495
4%
1204
47%
1204
6%
5001

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%10%5%9%9%5%7%7%7%8%25%
75928
Night
7%10%5%10%9%6%8%7%8%8%20%
82897
TransparencyDay
55%9%14%18%4
75551
Night
57%8%13%17%5%
82856
SeeingDay
15%415%29%26%12%
16096
Night
12%317%32%26%9%
23263

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
3338%13%9%11%9%10%11%19%
950
11th to 20thDay
39%5%12%13%8%10%8%7%5%19%
1291
21st to endDay
38%48%9%7%7%9%9%12%25%
1745
February1st to 10thDay
15%37%8%8%14%12%13%12%17%
1203
11th to 20thDay
26%410%9%6%9%10%11%12%21%
1275
21st to endDay
14412%12%5%9%8%10%11%23%
1292
March1st to 10thDay
46%410%9%6%9%9%10%13%21%
1656
11th to 20thDay
37%6%9%9%5%9%10%8%11%22%
1960
21st to endDay
26%48%9%6%9%10%10%11%25%
2272
April1st to 10thDay
5%11%5%10%8%6%6%8%9%8%24%
2340
11th to 20thDay
7%9%49%9%6%11%10%7%8%20%
2462
21st to endDay
7%8%410%11%8%10%8%6%7%22%
2700
May1st to 10thDay
10%13%5%10%10%5%6%6%7%6%20%
2920
11th to 20thDay
8%11%6%12%13%6%6%6%6%6%20%
3016
21st to endDay
13%13%7%14%10%45%5%6%6%17%
3589
June1st to 10thDay
16%12%6%8%6%36%5%6%7%27%
3420
11th to 20thDay
13%8%47%7%45%6%6%9%31%
3420
21st to endDay
9%8%36%5%35%6%6%9%39%
3420
July1st to 10thDay
12%5%36%6%36%7%8%9%36%
3420
11th to 20thDay
9%6%26%6%36%7%7%8%39%
3407
21st to endDay
14%6%36%7%45%6%7%8%35%
3332
August1st to 10thDay
12%6%37%5%45%5%5%7%40%
2965
11th to 20thDay
17%7%46%7%46%5%7%8%29%
2655
21st to endDay
14%9%49%7%46%5%5%7%31%
2802
September1st to 10thDay
19%13%5%8%9%45%45%7%23%
2340
11th to 20thDay
16%15%7%12%8%46%6%5%418%
2124
21st to endDay
23%15%7%10%7%3445%319%
1922
October1st to 10thDay
18%17%10%15%7%4445%413%
1756
11th to 20thDay
17%20%9%12%11%46%5%439%
1508
21st to endDay
16%23%7%15%13%5%5%4335%
1508
November1st to 10thDay
11%17%8%14%10%6%8%6%5%7%9%
1118
11th to 20thDay
7%15%5%11%8%6%8%6%5%7%20%
1005
21st to endDay
413%7%12%14%6%9%6%8%7%15%
760
December1st to 10thDay
29%5%10%12%10%10%9%8%10%14%
612
11th to 20thDay
49%410%9%7%9%8%9%14%17%
718
21st to endDay
6%13%6%13%9%5%6%5%8%8%19%
1045
January1st to 10thNight
35%49%12%7%10%11%12%11%17%
6005
11th to 20thNight
310%5%10%13%8%9%9%7%8%17%
5607
21st to endNight
48%49%8%47%9%10%10%28%
5909
February1st to 10thNight
3427%9%9%14%13%12%11%16%
2852
11th to 20thNight
245%8%9%7%10%10%10%12%23%
2572
21st to endNight
145%12%11%7%11%8%9%10%23%
1963
March1st to 10thNight
5%6%48%8%6%9%9%11%13%22%
2320
11th to 20thNight
28%411%7%6%10%8%7%9%28%
1998
21st to endNight
46%48%11%5%7%8%8%10%29%
2081
April1st to 10thNight
5%10%5%9%7%6%7%6%7%7%31%
1620
11th to 20thNight
6%9%47%10%5%8%7%7%7%29%
1449
21st to endNight
6%7%411%11%7%6%5%6%6%32%
1260
May1st to 10thNight
10%13%6%10%8%44446%32%
1039
11th to 20thNight
9%9%5%13%11%7%5%5%5%7%24%
877
21st to endNight
15%12%6%13%6%3445%6%26%
683
June1st to 10thNight
15%16%5%5%6%2446%7%31%
540
11th to 20thNight
13%10%47%6%36%6%5%6%35%
540
21st to endNight
12%8%48%3336%8%9%38%
540
July1st to 10thNight
15%5%35%5%35%5%6%8%41%
540
11th to 20thNight
9%5%25%6%5%6%5%7%10%40%
551
21st to endNight
16%7%35%5%36%5%46%39%
985
August1st to 10thNight
12%5%16%5%35%5%6%8%42%
973
11th to 20thNight
16%8%37%6%45%6%7%8%30%
1246
21st to endNight
17%9%36%7%36%6%6%6%30%
1553
September1st to 10thNight
18%12%49%6%45%45%7%25%
1620
11th to 20thNight
17%14%5%11%9%46%5%6%6%17%
1833
21st to endNight
24%15%7%8%7%4445%419%
2020
October1st to 10thNight
17%16%9%14%8%4444415%
2201
11th to 20thNight
16%20%9%12%9%46%44411%
2452
21st to endNight
18%21%8%14%12%5%7%5%334
2846
November1st to 10thNight
9%19%8%14%10%5%9%7%5%7%7%
2960
11th to 20thNight
8%14%6%10%10%5%7%6%7%9%17%
3174
21st to endNight
412%7%13%11%7%9%8%8%7%14%
3420
December1st to 10thNight
39%5%11%12%8%10%8%9%11%14%
3567
11th to 20thNight
49%5%8%9%7%9%8%10%13%18%
4479
21st to endNight
5%13%7%13%10%5%8%7%7%8%16%
6622

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
52%11%15%21%2
950
11th to 20thDay
61%11%14%9%4
1304
21st to endDay
47%6%9%20%18%
1745
February1st to 10thDay
46%13%17%22%2
1203
11th to 20thDay
47%10%16%21%6%
1282
21st to endDay
49%7%12%21%10%
1292
March1st to 10thDay
49%9%18%20%5%
1656
11th to 20thDay
50%8%14%20%8%1
1962
21st to endDay
45%11%14%20%10%
2272
April1st to 10thDay
54%8%10%18%10%
2340
11th to 20thDay
57%10%9%17%6%
2462
21st to endDay
58%9%10%17%5%
2700
May1st to 10thDay
61%10%8%16%6%
2920
11th to 20thDay
62%10%12%13%3
3020
21st to endDay
66%9%10%14%2
3590
June1st to 10thDay
56%8%14%19%3
3420
11th to 20thDay
48%9%14%25%3
3420
21st to endDay
39%9%19%29%4
3420
July1st to 10thDay
40%9%14%30%6%
3326
11th to 20thDay
38%9%18%29%5%
3302
21st to endDay
45%9%18%23%4
3147
August1st to 10thDay
41%9%18%26%6%
2945
11th to 20thDay
50%10%20%17%3
2655
21st to endDay
52%8%19%20%1
2802
September1st to 10thDay
61%8%15%15%1
2340
11th to 20thDay
67%9%14%10%
2124
21st to endDay
70%7%11%11%2
1922
October1st to 10thDay
76%8%10%5%1
1756
11th to 20thDay
80%7%8%32
1508
21st to endDay
85%6%5%41
1508
November1st to 10thDay
75%7%9%9%
1118
11th to 20thDay
62%9%11%15%3
1005
21st to endDay
67%7%10%13%2
760
December1st to 10thDay
61%10%13%12%5%
612
11th to 20thDay
53%12%11%23%3
718
21st to endDay
60%6%12%14%9%
1045
January1st to 10thNight
50%11%16%17%5%
6005
11th to 20thNight
60%9%17%11%2
5656
21st to endNight
44%7%8%24%17%
5909
February1st to 10thNight
50%12%17%17%3
2852
11th to 20thNight
47%9%16%23%5%
2575
21st to endNight
51%7%11%23%7%
1963
March1st to 10thNight
46%10%17%18%9%
2320
11th to 20thNight
49%6%13%22%9%
1998
21st to endNight
47%7%14%22%10%
2081
April1st to 10thNight
50%6%10%21%12%
1620
11th to 20thNight
50%9%10%23%8%
1449
21st to endNight
50%7%9%26%7%
1260
May1st to 10thNight
56%5%9%21%9%
1039
11th to 20thNight
59%9%11%15%6%
877
21st to endNight
59%7%7%24%3
683
June1st to 10thNight
53%6%13%25%3
540
11th to 20thNight
48%8%10%30%5%
540
21st to endNight
41%9%16%31%4
540
July1st to 10thNight
38%8%13%32%7%2
525
11th to 20thNight
37%7%20%30%6%
533
21st to endNight
44%6%20%25%5%
930
August1st to 10thNight
37%8%20%28%7%1
968
11th to 20thNight
49%10%20%19%2
1246
21st to endNight
52%9%16%21%2
1553
September1st to 10thNight
58%8%16%16%1
1620
11th to 20thNight
67%10%14%9%
1833
21st to endNight
69%7%11%12%1
2020
October1st to 10thNight
74%7%11%8%
2201
11th to 20thNight
78%6%8%6%2
2452
21st to endNight
86%6%341
2846
November1st to 10thNight
74%9%8%9%
2960
11th to 20thNight
62%10%11%16%1
3174
21st to endNight
65%9%11%12%3
3420
December1st to 10thNight
61%10%12%14%4
3567
11th to 20thNight
52%9%13%22%3
4479
21st to endNight
63%7%11%12%7%
6622

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
2111%32%36%18%
90
11th to 20thDay
6%9%20%43%19%3
90
21st to endDay
3218%39%21%17%
103
February1st to 10thDay
2212%30%35%19%
212
11th to 20thDay
225%47%33%10%
240
21st to endDay
218%34%36%21%
198
March1st to 10thDay
2219%28%31%18%
240
11th to 20thDay
5%310%35%34%13%
240
21st to endDay
6%320%31%23%18%
358
April1st to 10thDay
9%417%33%25%12%
600
11th to 20thDay
10%312%31%28%17%
590
21st to endDay
7%214%30%30%16%
600
May1st to 10thDay
14%417%26%23%15%
603
11th to 20thDay
11%420%33%24%9%
633
21st to endDay
19%5%16%28%23%9%
964
June1st to 10thDay
22%414%26%25%10%
990
11th to 20thDay
18%416%33%23%7%
990
21st to endDay
14%317%30%26%11%
990
July1st to 10thDay
14%412%24%31%16%
971
11th to 20thDay
12%416%33%26%9%
953
21st to endDay
16%316%28%23%14%
684
August1st to 10thDay
16%6%12%21%26%18%
626
11th to 20thDay
17%5%12%25%28%13%
615
21st to endDay
16%416%25%27%12%
693
September1st to 10thDay
26%5%15%21%23%10%
630
11th to 20thDay
21%417%28%18%11%
414
21st to endDay
28%7%16%22%18%8%
270
October1st to 10thDay
22%9%22%27%17%4
270
11th to 20thDay
27%7%18%22%21%6%
270
21st to endDay
19%7%19%28%23%4
297
November1st to 10thDay
13%213%35%27%10%
180
11th to 20thDay
12%215%33%25%12%
123
21st to endDay
9%213%31%32%12%
90
December1st to 10thDay
6%12%46%26%11%
90
11th to 20thDay
7%111%37%29%16%
90
21st to endDay
6%222%28%28%13%
99
January1st to 10thNight
6%215%33%32%12%
1130
11th to 20thNight
7%420%35%24%10%
1024
21st to endNight
4323%36%25%9%
1045
February1st to 10thNight
4316%33%31%13%
923
11th to 20thNight
4113%43%30%8%
879
21st to endNight
2116%34%36%11%
740
March1st to 10thNight
5%418%36%28%9%
880
11th to 20thNight
6%214%38%29%11%
558
21st to endNight
6%317%36%27%11%
594
April1st to 10thNight
10%420%33%26%8%
540
11th to 20thNight
9%214%35%32%8%
533
21st to endNight
10%314%33%31%9%
540
May1st to 10thNight
13%317%34%26%7%
319
11th to 20thNight
12%320%39%24%2
177
21st to endNight
19%421%24%26%6%
194
June1st to 10thNight
21%6%14%27%29%4
180
11th to 20thNight
19%218%38%19%3
180
21st to endNight
17%318%41%20%1
180
July1st to 10thNight
15%115%29%36%4
175
11th to 20thNight
10%6%14%37%30%2
174
21st to endNight
19%414%30%29%4
197
August1st to 10thNight
12%213%39%26%8%
257
11th to 20thNight
20%5%15%28%28%4
534
21st to endNight
23%315%28%25%5%
594
September1st to 10thNight
24%414%27%24%6%
540
11th to 20thNight
21%418%34%18%5%
540
21st to endNight
29%5%19%27%18%2
580
October1st to 10thNight
24%6%21%27%17%5%
761
11th to 20thNight
23%6%20%25%22%5%
900
21st to endNight
27%6%18%25%20%5%
990
November1st to 10thNight
14%318%34%22%9%
925
11th to 20thNight
12%223%31%23%9%
958
21st to endNight
9%5%15%29%28%15%
1040
December1st to 10thNight
6%315%36%26%14%
1109
11th to 20thNight
7%415%32%27%14%
1130
21st to endNight
8%419%29%27%13%
1243
Page generated at 2024-02-02 04:20:29. Version ac07

Copyright 2024 Attilla Danko


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