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 2025-02-25.

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
45%
24358
6%
114353
5%
24151
47%
24151
9%
82330

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
52%
1134
14%
8348
7%
1116
55%
1116
7%
4927
January11th to 20thNight
48%
1047
4%
7869
8%
1025
52%
1025
6%
5430
January21st to endNight
47%
1072
12%
8022
10%
1056
53%
1056
9%
4497
February1st to 10thNight
60%
1000
8%
3090
6%
1000
62%
1000
16%
2289
February11th to 20thNight
62%
974
10%
2869
7%
974
63%
974
21%
2026
February21st to endNight
57%
808
13%
2143
8%
808
58%
808
22%
1567
March1st to 10thNight
54%
918
14%
3830
8%
912
57%
912
15%
2583
March11th to 20thNight
58%
577
9%
3451
15%
569
63%
569
10%
2510
March21st to endNight
56%
607
9%
3356
12%
605
59%
605
13%
2084
April1st to 10thNight
49%
570
8%
1710
5%
570
51%
570
20%
1223
April11th to 20thNight
52%
563
2%
1529
2%
563
52%
563
20%
1143
April21st to endNight
50%
570
0%
1330
0%
570
50%
570
23%
1011
May1st to 10thNight
43%
333
0%
1797
0%
332
43%
332
9%
1438
May11th to 20thNight
39%
187
0%
1521
0%
187
39%
187
4%
1103
May21st to endNight
34%
205
0%
1199
0%
205
34%
205
8%
736
June1st to 10thNight
44%
190
0%
570
0%
190
44%
190
18%
419
June11th to 20thNight
46%
190
0%
570
0%
190
46%
190
20%
403
June21st to endNight
51%
190
0%
570
0%
190
51%
190
25%
371
July1st to 10thNight
57%
185
0%
871
0%
185
57%
185
21%
472
July11th to 20thNight
62%
184
0%
893
0%
184
62%
184
18%
532
July21st to endNight
57%
208
0%
1507
0%
197
56%
197
13%
708
August1st to 10thNight
64%
268
0%
1599
0%
266
64%
266
17%
823
August11th to 20thNight
47%
551
0%
2021
0%
543
48%
543
16%
1285
August21st to endNight
46%
619
0%
2615
1%
605
47%
605
12%
1921
September1st to 10thNight
40%
570
3%
1710
2%
570
40%
570
13%
1332
September11th to 20thNight
34%
570
3%
1935
2%
570
34%
570
8%
1621
September21st to endNight
27%
613
5%
2133
4%
613
30%
613
8%
1771
October1st to 10thNight
23%
795
4%
3860
4%
784
25%
784
4%
3499
October11th to 20thNight
23%
946
2%
4269
2%
930
24%
930
3%
3843
October21st to endNight
20%
1031
1%
4895
1%
1022
20%
1022
1%
4486
November1st to 10thNight
33%
975
3%
3120
3%
975
33%
975
6%
2743
November11th to 20thNight
35%
1009
7%
3342
4%
1009
39%
1009
10%
2689
November21st to endNight
43%
1100
6%
3600
5%
1100
46%
1100
9%
2943
December1st to 10thNight
50%
1141
6%
6111
7%
1139
53%
1139
8%
4063
December11th to 20thNight
51%
1170
7%
6744
9%
1159
53%
1159
9%
4310
December21st to endNight
42%
1288
2%
9354
4%
1238
45%
1238
4%
7529

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%410%7%6%6%5%7%8%27%
110204
Night
7%11%5%12%8%7%7%5%7%9%22%
117137
TransparencyDay
53%7%13%21%6%
109872
Night
57%7%13%18%6%
117117
SeeingDay
14%416%29%25%12%
17536
Night
12%418%33%26%8%
24686

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
36%210%9%9%9%5%8%12%27%
1360
11th to 20thDay
28%5%14%9%9%8%6%7%7%25%
1862
21st to endDay
26%37%8%8%8%8%9%13%28%
2507
February1st to 10thDay
16%27%8%12%13%10%12%12%17%
1310
11th to 20thDay
17%39%8%8%9%8%12%13%22%
1420
21st to endDay
15%313%10%8%8%7%10%12%23%
1405
March1st to 10thDay
37%412%7%9%11%6%8%10%23%
2878
11th to 20thDay
310%6%13%10%8%8%6%8%9%20%
3447
21st to endDay
15%28%10%8%8%6%8%14%30%
4004
April1st to 10thDay
5%12%411%7%8%7%6%10%7%23%
2470
11th to 20thDay
7%11%310%8%9%11%7%7%7%20%
2602
21st to endDay
6%8%312%10%10%10%6%6%7%21%
2850
May1st to 10thDay
10%21%6%14%8%6%5%35%416%
5162
11th to 20thDay
12%13%7%11%7%5%435%7%25%
5350
21st to endDay
10%11%5%13%8%6%5%46%6%25%
6379
June1st to 10thDay
15%13%5%10%5%5%5%46%6%26%
3610
11th to 20thDay
13%10%39%6%5%5%5%6%8%30%
3610
21st to endDay
9%8%37%5%46%5%7%8%38%
3610
July1st to 10thDay
9%5%27%5%5%6%6%9%10%36%
6020
11th to 20thDay
6%5%37%5%5%6%6%7%8%41%
5979
21st to endDay
9%5%25%445%47%8%46%
5834
August1st to 10thDay
8%6%38%45%445%7%47%
5198
11th to 20thDay
17%6%36%5%4446%7%37%
4658
21st to endDay
18%8%39%5%5%6%46%7%28%
4923
September1st to 10thDay
19%14%410%7%5%5%35%6%22%
2470
11th to 20thDay
17%16%6%13%6%5%5%5%5%417%
2242
21st to endDay
24%16%7%10%6%4434318%
2028
October1st to 10thDay
20%26%13%14%5%432337%
3077
11th to 20thDay
19%19%11%15%7%5%44339%
2624
21st to endDay
12%19%8%22%11%6%7%4434
2606
November1st to 10thDay
10%18%7%17%8%8%8%45%6%9%
1178
11th to 20thDay
7%16%5%12%8%8%8%45%7%20%
1057
21st to endDay
414%5%14%12%8%8%7%7%7%13%
800
December1st to 10thDay
16%311%12%12%9%8%10%15%12%
1050
11th to 20thDay
27%38%7%9%12%9%9%12%22%
1128
21st to endDay
5%20%8%20%9%5%436%6%15%
1496
January1st to 10thNight
27%410%8%7%7%6%10%11%27%
8605
11th to 20thNight
39%5%12%10%9%8%6%8%9%21%
8025
21st to endNight
37%39%7%7%7%6%10%13%29%
8447
February1st to 10thNight
2429%8%12%14%10%12%10%17%
3090
11th to 20thNight
25%49%8%10%10%8%10%11%23%
2866
21st to endNight
15%412%10%10%9%7%10%10%22%
2143
March1st to 10thNight
37%311%7%9%9%6%9%11%27%
4000
11th to 20thNight
6%11%5%13%8%8%7%5%8%7%22%
3512
21st to endNight
2428%10%9%7%7%8%11%31%
3627
April1st to 10thNight
5%11%411%6%8%7%47%7%30%
1710
11th to 20thNight
5%10%49%8%7%7%6%7%7%28%
1529
21st to endNight
6%8%312%9%8%6%46%6%32%
1330
May1st to 10thNight
11%18%8%14%8%5%3345%22%
1803
11th to 20thNight
15%13%7%10%7%5%345%5%25%
1544
21st to endNight
9%12%6%11%444349%33%
1204
June1st to 10thNight
15%17%5%6%43336%7%30%
570
11th to 20thNight
13%10%38%6%45%5%5%5%34%
570
21st to endNight
11%8%48%3345%8%8%39%
570
July1st to 10thNight
12%5%25%44446%10%44%
950
11th to 20thNight
7%5%26%6%7%6%5%7%11%37%
988
21st to endNight
10%5%2435%435%7%51%
1718
August1st to 10thNight
8%6%27%34446%11%45%
1734
11th to 20thNight
14%7%27%445%47%7%38%
2181
21st to endNight
23%8%38%5%5%5%46%6%28%
2743
September1st to 10thNight
19%12%410%5%5%5%35%7%24%
1710
11th to 20thNight
18%14%5%12%8%5%6%46%5%17%
1935
21st to endNight
25%16%7%9%5%5%434419%
2133
October1st to 10thNight
21%21%12%16%5%432339%
3883
11th to 20thNight
17%20%11%17%7%5%5%3339%
4305
21st to endNight
12%21%9%21%10%6%6%3336%
4950
November1st to 10thNight
8%21%7%15%8%8%8%5%5%7%8%
3120
11th to 20thNight
7%16%5%12%9%7%6%5%7%9%16%
3342
21st to endNight
5%12%6%15%10%10%8%6%8%7%14%
3600
December1st to 10thNight
26%310%11%11%10%7%11%17%12%
6139
11th to 20thNight
28%37%7%10%10%8%9%11%24%
7079
21st to endNight
5%18%8%18%8%6%7%46%6%13%
9482

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
47%8%12%27%5%
1360
11th to 20thDay
55%8%19%15%4
1875
21st to endDay
43%415%23%15%
2507
February1st to 10thDay
47%12%17%22%21
1310
11th to 20thDay
45%10%17%20%7%
1427
21st to endDay
48%7%12%23%10%
1405
March1st to 10thDay
52%8%13%21%6%
2878
11th to 20thDay
56%7%10%15%12%
3449
21st to endDay
41%8%11%24%15%
4004
April1st to 10thDay
54%8%10%18%10%
2470
11th to 20thDay
57%10%9%17%7%
2602
21st to endDay
58%9%10%17%5%
2850
May1st to 10thDay
71%7%6%12%4
5162
11th to 20thDay
59%8%10%17%5%
5354
21st to endDay
55%9%8%22%6%
6380
June1st to 10thDay
56%8%14%19%3
3610
11th to 20thDay
49%9%14%25%3
3610
21st to endDay
39%8%19%29%4
3610
July1st to 10thDay
39%6%17%33%5%
5926
11th to 20thDay
38%6%15%36%6%
5874
21st to endDay
34%6%17%35%9%
5650
August1st to 10thDay
37%5%17%28%10%2
5178
11th to 20thDay
45%6%19%23%6%1
4703
21st to endDay
55%5%21%16%3
4922
September1st to 10thDay
62%7%15%15%1
2470
11th to 20thDay
68%9%13%9%
2242
21st to endDay
71%7%10%11%1
2028
October1st to 10thDay
84%5%6%4
3077
11th to 20thDay
82%5%6%7%1
2624
21st to endDay
85%37%41
2606
November1st to 10thDay
76%6%9%8%
1178
11th to 20thDay
62%9%12%15%3
1057
21st to endDay
68%7%10%13%2
800
December1st to 10thDay
57%6%23%11%3
1050
11th to 20thDay
49%8%10%30%2
1128
21st to endDay
70%48%11%7%
1496
January1st to 10thNight
45%8%14%24%10%
8605
11th to 20thNight
56%7%18%16%3
8074
21st to endNight
43%5%12%27%14%
8447
February1st to 10thNight
50%12%18%17%4
3090
11th to 20thNight
47%8%16%22%6%
2869
21st to endNight
50%7%11%24%8%
2143
March1st to 10thNight
47%8%14%24%8%
4000
11th to 20thNight
56%8%9%14%13%
3512
21st to endNight
42%7%11%26%13%
3627
April1st to 10thNight
51%6%10%20%13%
1710
11th to 20thNight
50%9%10%22%9%
1529
21st to endNight
50%8%9%26%7%
1330
May1st to 10thNight
65%7%7%13%7%
1803
11th to 20thNight
60%8%9%15%8%
1544
21st to endNight
47%9%6%28%10%
1204
June1st to 10thNight
53%6%12%24%4
570
11th to 20thNight
49%8%10%29%4
570
21st to endNight
40%8%17%31%3
570
July1st to 10thNight
35%5%15%39%5%1
935
11th to 20thNight
40%417%32%7%
970
21st to endNight
33%418%31%14%
1663
August1st to 10thNight
34%5%23%23%13%2
1729
11th to 20thNight
42%6%21%22%8%
2202
21st to endNight
56%5%17%21%1
2743
September1st to 10thNight
59%8%16%16%1
1710
11th to 20thNight
68%9%14%9%
1935
21st to endNight
70%6%11%12%1
2133
October1st to 10thNight
82%47%7%
3883
11th to 20thNight
82%46%7%2
4305
21st to endNight
85%45%5%
4950
November1st to 10thNight
74%8%8%9%
3120
11th to 20thNight
62%9%11%16%1
3342
21st to endNight
65%9%11%12%3
3600
December1st to 10thNight
54%6%26%12%2
6139
11th to 20thNight
49%6%13%28%3
7079
21st to endNight
70%5%11%8%5%
9482

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
3112%33%35%16%
100
11th to 20thDay
5%8%21%43%20%3
100
21st to endDay
3321%39%20%15%
115
February1st to 10thDay
2214%30%34%18%
255
11th to 20thDay
129%46%33%9%
300
21st to endDay
18%37%34%19%
237
March1st to 10thDay
3118%30%31%17%
270
11th to 20thDay
5%311%36%32%13%
270
21st to endDay
5%319%31%25%17%
398
April1st to 10thDay
9%5%18%33%24%11%
650
11th to 20thDay
10%412%30%28%16%
640
21st to endDay
7%214%31%30%16%
650
May1st to 10thDay
14%416%27%24%15%
653
11th to 20thDay
11%420%32%24%10%
684
21st to endDay
18%5%17%27%23%10%
1036
June1st to 10thDay
21%415%26%25%9%
1060
11th to 20thDay
18%5%15%32%23%7%
1060
21st to endDay
13%318%31%25%10%
1060
July1st to 10thDay
14%412%26%30%15%
1041
11th to 20thDay
11%417%33%26%9%
1021
21st to endDay
15%316%28%23%14%
739
August1st to 10thDay
15%5%13%23%26%18%
676
11th to 20thDay
18%5%11%25%28%13%
665
21st to endDay
18%417%25%25%11%
748
September1st to 10thDay
26%6%14%22%23%9%
680
11th to 20thDay
23%418%27%17%11%
452
21st to endDay
31%8%16%22%16%7%
300
October1st to 10thDay
25%9%21%26%15%4
300
11th to 20thDay
28%7%19%22%19%5%
300
21st to endDay
18%8%18%30%22%4
330
November1st to 10thDay
13%214%37%26%9%
200
11th to 20thDay
12%316%33%25%11%
136
21st to endDay
9%213%33%32%11%
100
December1st to 10thDay
5%13%44%27%11%
100
11th to 20thDay
6%113%38%28%14%
100
21st to endDay
7%224%28%27%12%
110
January1st to 10thNight
6%215%34%31%11%
1200
11th to 20thNight
7%420%36%24%10%
1081
21st to endNight
4324%37%24%9%
1100
February1st to 10thNight
4317%33%31%12%
1000
11th to 20thNight
4114%44%29%8%
979
21st to endNight
2116%36%36%10%
808
March1st to 10thNight
5%419%37%28%8%
928
11th to 20thNight
6%314%38%28%10%
589
21st to endNight
6%217%36%28%11%
627
April1st to 10thNight
10%421%32%25%7%
570
11th to 20thNight
9%314%36%31%7%
563
21st to endNight
9%315%35%29%9%
570
May1st to 10thNight
13%417%34%26%7%
335
11th to 20thNight
12%320%39%25%2
187
21st to endNight
18%420%24%27%6%
205
June1st to 10thNight
21%5%15%26%28%4
190
11th to 20thNight
19%219%37%19%3
190
21st to endNight
16%319%42%20%1
190
July1st to 10thNight
15%216%30%35%4
185
11th to 20thNight
10%6%14%37%30%2
184
21st to endNight
18%413%31%29%4
208
August1st to 10thNight
11%314%38%27%8%
273
11th to 20thNight
20%5%15%28%28%4
564
21st to endNight
24%315%28%25%5%
627
September1st to 10thNight
25%5%14%28%24%5%
570
11th to 20thNight
23%418%34%17%4
570
21st to endNight
30%6%19%26%17%2
613
October1st to 10thNight
25%6%21%27%17%5%
804
11th to 20thNight
24%6%20%25%21%4
950
21st to endNight
26%6%19%25%20%4
1045
November1st to 10thNight
14%318%34%22%8%
975
11th to 20thNight
13%323%31%22%8%
1009
21st to endNight
9%5%15%30%27%14%
1100
December1st to 10thNight
6%215%37%27%13%
1177
11th to 20thNight
7%416%34%27%13%
1200
21st to endNight
8%419%30%26%12%
1320
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