Moosonee / Moose Factory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Moosonee / Moose Factory clear sky chart from 2005-11-06 to 2024-01-12.

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
33%
23338
7%
74812
5%
23298
36%
23298
12%
59227

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
24%
949
5%
2838
3%
946
26%
946
6%
2504
January11th to 20thNight
32%
906
3%
2716
2%
906
33%
906
8%
2323
January21st to endNight
41%
990
7%
2894
5%
990
43%
990
10%
2415
February1st to 10thNight
41%
778
10%
2398
8%
778
44%
778
12%
1925
February11th to 20thNight
34%
702
6%
2275
5%
699
36%
699
9%
1893
February21st to endNight
38%
592
9%
1924
7%
592
40%
592
12%
1508
March1st to 10thNight
36%
720
11%
2092
8%
720
39%
720
13%
1664
March11th to 20thNight
32%
720
10%
1980
6%
720
35%
720
13%
1602
March21st to endNight
36%
792
13%
2178
8%
792
40%
792
17%
1664
April1st to 10thNight
35%
653
11%
1756
8%
653
37%
653
17%
1377
April11th to 20thNight
43%
533
14%
1597
11%
533
45%
533
18%
1165
April21st to endNight
38%
540
13%
1620
11%
540
42%
540
19%
1179
May1st to 10thNight
38%
360
11%
1440
13%
360
42%
360
14%
1010
May11th to 20thNight
39%
354
11%
1303
13%
354
43%
354
17%
898
May21st to endNight
40%
388
5%
1358
3%
388
41%
388
16%
959
June1st to 10thNight
45%
360
3%
1260
0%
360
45%
360
19%
853
June11th to 20thNight
48%
360
0%
1260
0%
360
48%
360
21%
821
June21st to endNight
51%
360
0%
1260
0%
360
51%
360
20%
842
July1st to 10thNight
49%
350
2%
1225
0%
350
49%
350
19%
830
July11th to 20thNight
52%
348
4%
1218
3%
348
52%
348
18%
815
July21st to endNight
53%
394
6%
1301
7%
372
52%
372
13%
964
August1st to 10thNight
51%
426
7%
1409
8%
424
53%
424
15%
1030
August11th to 20thNight
47%
534
11%
1598
10%
534
49%
534
20%
1114
August21st to endNight
47%
594
13%
1782
11%
594
49%
594
20%
1274
September1st to 10thNight
41%
656
11%
1736
6%
656
42%
656
22%
1268
September11th to 20thNight
35%
720
9%
1914
4%
720
37%
720
18%
1456
September21st to endNight
36%
720
12%
2000
6%
720
39%
720
19%
1480
October1st to 10thNight
29%
720
12%
2160
9%
720
35%
720
15%
1637
October11th to 20thNight
23%
720
7%
2160
5%
720
26%
720
9%
1793
October21st to endNight
25%
792
6%
2639
6%
792
27%
792
8%
2204
November1st to 10thNight
17%
740
5%
2592
3%
740
21%
740
6%
2208
November11th to 20thNight
16%
760
5%
2660
2%
760
21%
760
6%
2253
November21st to endNight
12%
873
3%
2773
1%
873
14%
873
4%
2480
December1st to 10thNight
22%
950
4%
2850
2%
950
24%
950
7%
2460
December11th to 20thNight
29%
950
5%
3480
3%
948
31%
948
7%
2961
December21st to endNight
23%
1034
3%
5166
4%
1026
24%
1026
4%
4398

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
17%12%5%9%7%45%5%5%6%25%
74647
Night
15%14%6%10%8%46%6%5%5%22%
75076
TransparencyDay
58%7%12%16%6%
74330
Night
62%7%11%14%5%
74928
SeeingDay
20%7%24%31%15%3
14232
Night
21%6%26%32%14%2
23352

By Month

Percentage Cloud Cover NE (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
10%18%8%14%10%6%7%8%7%5%7%
1328
11th to 20thDay
11%14%7%12%9%7%10%8%7%5%10%
1267
21st to endDay
9%14%6%11%10%6%8%10%9%5%11%
1462
February1st to 10thDay
8%13%6%11%10%6%9%9%7%6%16%
1562
11th to 20thDay
10%17%6%10%8%5%7%9%8%6%14%
1573
21st to endDay
8%12%6%10%9%6%8%8%6%7%20%
1332
March1st to 10thDay
12%12%410%10%7%9%8%5%6%18%
1863
11th to 20thDay
10%13%6%11%8%6%6%5%6%6%22%
1980
21st to endDay
13%12%410%8%5%7%5%5%5%25%
2178
April1st to 10thDay
17%15%7%9%8%45%34424%
2220
11th to 20thDay
15%12%6%8%7%3445%6%30%
2312
21st to endDay
15%12%6%8%6%33445%34%
2340
May1st to 10thDay
17%12%49%5%46%5%46%29%
2520
11th to 20thDay
21%11%47%6%44445%31%
2589
21st to endDay
18%11%47%6%35%448%28%
2919
June1st to 10thDay
20%9%47%5%3435%6%34%
2700
11th to 20thDay
13%7%37%6%445%6%6%40%
2700
21st to endDay
17%7%36%6%35%5%5%7%36%
2700
July1st to 10thDay
19%8%47%6%345%5%7%33%
2700
11th to 20thDay
18%6%26%6%45%5%6%9%34%
2700
21st to endDay
20%8%47%7%35%5%6%8%27%
2940
August1st to 10thDay
20%9%38%6%46%5%6%7%27%
2517
11th to 20thDay
19%9%36%6%35%45%8%32%
2303
21st to endDay
19%9%48%5%35%5%6%7%29%
2574
September1st to 10thDay
20%8%37%6%445%5%7%32%
2206
11th to 20thDay
23%10%47%7%35%5%5%6%24%
2044
21st to endDay
26%11%46%6%34445%28%
1960
October1st to 10thDay
25%15%47%5%34445%24%
1800
11th to 20thDay
24%18%5%8%6%35%446%17%
1800
21st to endDay
23%19%5%10%8%3444415%
1714
November1st to 10thDay
22%24%8%10%6%3334414%
1486
11th to 20thDay
26%20%7%11%6%3343413%
1520
21st to endDay
19%21%9%12%7%46%42313%
1406
December1st to 10thDay
13%19%9%11%9%46%6%45%14%
1330
11th to 20thDay
12%17%6%10%14%5%5%6%5%5%14%
1671
21st to endDay
14%16%7%15%13%5%6%6%5%5%8%
2431
January1st to 10thNight
11%19%8%14%10%5%8%8%5%49%
2838
11th to 20thNight
11%14%7%12%10%6%9%10%8%49%
2716
21st to endNight
9%12%7%11%10%8%10%9%7%413%
2894
February1st to 10thNight
7%10%5%11%11%7%12%9%7%5%15%
2398
11th to 20thNight
9%16%5%11%11%6%9%8%8%414%
2273
21st to endNight
5%13%6%12%9%5%10%10%6%7%18%
1924
March1st to 10thNight
11%9%411%10%7%9%8%6%5%20%
2082
11th to 20thNight
12%14%7%9%8%49%6%5%5%21%
1979
21st to endNight
11%11%5%10%9%5%6%445%28%
2178
April1st to 10thNight
20%13%48%6%45%45%6%25%
1756
11th to 20thNight
11%12%6%9%6%35%45%6%32%
1597
21st to endNight
15%13%5%8%6%43445%33%
1620
May1st to 10thNight
17%10%47%6%445%5%6%30%
1440
11th to 20thNight
20%9%36%5%3445%7%33%
1303
21st to endNight
18%7%47%6%45%5%6%8%30%
1357
June1st to 10thNight
18%8%37%5%33437%38%
1260
11th to 20thNight
13%8%37%6%345%6%8%38%
1260
21st to endNight
15%6%36%6%35%5%6%8%37%
1260
July1st to 10thNight
16%7%347%35%6%7%8%35%
1260
11th to 20thNight
13%7%36%6%36%5%6%8%35%
1260
21st to endNight
17%7%27%7%46%6%7%7%29%
1378
August1st to 10thNight
19%9%36%6%35%5%6%7%30%
1417
11th to 20thNight
17%8%26%5%346%6%8%35%
1598
21st to endNight
17%8%37%6%35%5%6%7%33%
1782
September1st to 10thNight
21%8%35%435%5%47%35%
1736
11th to 20thNight
23%11%36%5%345%47%29%
1914
21st to endNight
21%11%45%5%3445%6%34%
2000
October1st to 10thNight
23%9%37%6%44446%30%
2160
11th to 20thNight
24%16%49%7%44445%18%
2160
21st to endNight
20%17%5%10%7%35%44418%
2639
November1st to 10thNight
20%20%7%11%7%34345%16%
2592
11th to 20thNight
21%22%8%9%6%3443415%
2660
21st to endNight
20%21%9%12%10%3443310%
2773
December1st to 10thNight
13%19%9%13%8%5%6%5%5%5%12%
2850
11th to 20thNight
11%18%7%12%9%6%6%6%5%5%15%
3526
21st to endNight
11%19%9%15%11%5%5%5%4312%
5236

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
75%5%10%9%2
1329
11th to 20thDay
69%8%8%10%4
1267
21st to endDay
67%6%8%12%6%
1462
February1st to 10thDay
64%5%8%18%5%
1562
11th to 20thDay
65%7%12%12%4
1582
21st to endDay
62%7%11%14%6%
1332
March1st to 10thDay
64%7%11%14%4
1866
11th to 20thDay
62%6%11%13%8%
1980
21st to endDay
60%6%11%16%7%1
2178
April1st to 10thDay
64%5%7%14%9%1
2220
11th to 20thDay
54%7%10%17%11%1
2312
21st to endDay
52%6%9%18%13%2
2340
May1st to 10thDay
55%6%10%18%10%1
2520
11th to 20thDay
55%6%11%18%10%
2593
21st to endDay
53%8%12%19%8%
2919
June1st to 10thDay
50%6%10%22%12%1
2700
11th to 20thDay
44%6%11%23%14%1
2700
21st to endDay
46%7%13%21%11%1
2700
July1st to 10thDay
49%7%12%24%7%
2626
11th to 20thDay
43%9%16%26%5%
2619
21st to endDay
54%10%17%16%3
2777
August1st to 10thDay
54%10%18%15%4
2501
11th to 20thDay
50%9%16%19%5%1
2303
21st to endDay
51%10%14%20%4
2574
September1st to 10thDay
50%9%17%19%5%
2206
11th to 20thDay
59%8%16%15%2
2044
21st to endDay
58%6%12%17%7%
1960
October1st to 10thDay
62%6%14%14%4
1800
11th to 20thDay
69%6%12%11%2
1800
21st to endDay
71%7%10%10%2
1714
November1st to 10thDay
75%7%8%8%2
1486
11th to 20thDay
77%5%9%9%1
1520
21st to endDay
77%6%7%9%1
1406
December1st to 10thDay
71%7%10%11%2
1330
11th to 20thDay
70%8%9%11%2
1671
21st to endDay
75%8%9%7%2
2431
January1st to 10thNight
76%6%8%9%1
2838
11th to 20thNight
71%7%11%8%3
2716
21st to endNight
69%6%10%12%3
2894
February1st to 10thNight
65%5%8%15%6%
2398
11th to 20thNight
68%7%10%10%5%
2275
21st to endNight
62%7%11%15%5%
1924
March1st to 10thNight
61%7%10%14%7%
2092
11th to 20thNight
64%6%9%14%7%
1980
21st to endNight
58%49%18%10%1
2178
April1st to 10thNight
60%5%7%17%10%1
1756
11th to 20thNight
53%6%9%20%12%1
1597
21st to endNight
54%5%8%16%16%1
1620
May1st to 10thNight
54%6%8%19%11%2
1440
11th to 20thNight
51%6%12%18%12%1
1304
21st to endNight
51%7%12%18%11%1
1358
June1st to 10thNight
48%6%10%23%12%2
1260
11th to 20thNight
44%7%11%22%15%1
1260
21st to endNight
45%8%15%19%12%2
1260
July1st to 10thNight
45%10%14%22%9%
1225
11th to 20thNight
45%10%15%23%7%1
1218
21st to endNight
53%12%16%17%2
1301
August1st to 10thNight
50%12%17%18%4
1409
11th to 20thNight
46%9%19%21%5%
1598
21st to endNight
48%8%16%21%6%
1782
September1st to 10thNight
49%7%16%21%6%
1736
11th to 20thNight
54%8%17%17%4
1914
21st to endNight
52%8%13%20%8%
2000
October1st to 10thNight
56%7%14%18%5%
2160
11th to 20thNight
68%7%11%12%2
2160
21st to endNight
70%6%10%11%2
2639
November1st to 10thNight
73%6%10%9%2
2592
11th to 20thNight
73%6%10%10%2
2660
21st to endNight
79%6%8%6%1
2773
December1st to 10thNight
73%7%9%9%2
2850
11th to 20thNight
69%8%9%10%3
3525
21st to endNight
74%7%7%10%2
5236

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
14%9%32%27%16%2
180
11th to 20thDay
11%9%28%33%16%2
162
21st to endDay
15%321%33%20%6%
210
February1st to 10thDay
9%11%26%33%18%3
240
11th to 20thDay
15%8%35%30%13%1
240
21st to endDay
17%9%30%34%9%1
198
March1st to 10thDay
15%8%28%32%14%4
320
11th to 20thDay
14%7%28%32%13%6%
420
21st to endDay
15%7%31%35%10%2
462
April1st to 10thDay
16%7%26%32%16%3
420
11th to 20thDay
18%6%23%33%14%5%
412
21st to endDay
22%7%21%28%16%5%
420
May1st to 10thDay
19%7%22%30%16%5%
423
11th to 20thDay
23%6%25%28%14%3
558
21st to endDay
20%5%25%33%15%2
679
June1st to 10thDay
20%426%35%13%2
630
11th to 20thDay
15%5%27%37%13%3
630
21st to endDay
19%5%21%33%19%4
630
July1st to 10thDay
20%5%22%34%16%3
621
11th to 20thDay
18%321%37%17%3
618
21st to endDay
21%6%17%36%17%4
684
August1st to 10thDay
23%5%16%31%19%6%
528
11th to 20thDay
19%6%18%26%26%5%
439
21st to endDay
23%5%20%28%18%6%
495
September1st to 10thDay
18%7%26%31%17%2
450
11th to 20thDay
26%6%23%32%10%3
450
21st to endDay
28%7%23%24%15%4
450
October1st to 10thDay
27%10%25%24%12%2
450
11th to 20thDay
34%8%19%29%8%2
450
21st to endDay
27%5%27%29%11%1
265
November1st to 10thDay
29%12%34%21%4
180
11th to 20thDay
32%7%29%21%10%2
180
21st to endDay
25%11%36%22%42
180
December1st to 10thDay
21%9%23%23%19%5%
180
11th to 20thDay
12%14%27%31%17%1
180
21st to endDay
15%10%35%24%13%3
198
January1st to 10thNight
19%6%29%31%13%2
950
11th to 20thNight
17%7%27%34%14%2
906
21st to endNight
14%421%35%23%4
990
February1st to 10thNight
12%425%40%17%2
778
11th to 20thNight
18%425%36%16%1
703
21st to endNight
13%5%25%37%19%2
592
March1st to 10thNight
14%6%28%34%16%2
720
11th to 20thNight
17%7%31%31%12%2
720
21st to endNight
15%5%28%36%14%1
792
April1st to 10thNight
25%6%24%31%13%1
653
11th to 20thNight
17%5%22%38%15%3
533
21st to endNight
20%6%26%32%12%4
540
May1st to 10thNight
20%5%26%31%16%2
360
11th to 20thNight
22%8%25%32%11%2
354
21st to endNight
20%6%25%37%11%1
389
June1st to 10thNight
19%5%23%38%13%2
360
11th to 20thNight
14%424%39%18%1
360
21st to endNight
16%421%39%19%1
360
July1st to 10thNight
19%320%38%17%2
350
11th to 20thNight
16%320%45%16%1
348
21st to endNight
18%313%42%22%3
394
August1st to 10thNight
23%413%33%25%2
426
11th to 20thNight
20%420%35%18%2
534
21st to endNight
20%419%37%18%3
594
September1st to 10thNight
24%6%23%32%14%1
656
11th to 20thNight
27%6%25%30%11%1
720
21st to endNight
26%6%25%29%12%3
720
October1st to 10thNight
27%9%28%26%10%1
720
11th to 20thNight
30%8%28%22%9%3
720
21st to endNight
28%9%26%27%10%1
792
November1st to 10thNight
27%11%32%21%7%1
740
11th to 20thNight
31%11%28%22%7%1
760
21st to endNight
29%10%32%22%7%1
873
December1st to 10thNight
21%10%29%27%11%2
950
11th to 20thNight
17%9%27%30%14%2
950
21st to endNight
20%7%27%31%11%4
1045
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