La Ronge
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the La Ronge clear sky chart from 2005-11-06 to 2024-01-14.

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
40%
23984
10%
74753
7%
23957
44%
23957
18%
53166

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
30%
947
10%
3026
5%
946
35%
946
12%
2383
January11th to 20thNight
33%
918
10%
2844
7%
918
37%
918
13%
2237
January21st to endNight
30%
990
10%
2948
7%
990
35%
990
12%
2387
February1st to 10thNight
39%
900
12%
2520
8%
900
43%
900
18%
1869
February11th to 20thNight
44%
770
13%
2344
11%
770
46%
770
18%
1699
February21st to endNight
49%
592
17%
1895
14%
592
53%
592
19%
1315
March1st to 10thNight
44%
720
15%
2160
12%
720
46%
720
19%
1565
March11th to 20thNight
41%
720
18%
2066
12%
720
47%
720
21%
1478
March21st to endNight
47%
635
18%
2021
16%
635
52%
635
22%
1369
April1st to 10thNight
51%
540
16%
1800
15%
540
54%
540
23%
1185
April11th to 20thNight
45%
533
16%
1597
13%
533
47%
533
23%
1103
April21st to endNight
46%
540
14%
1440
8%
540
49%
540
25%
1004
May1st to 10thNight
51%
540
10%
1440
7%
540
53%
540
29%
975
May11th to 20thNight
52%
466
3%
1232
3%
466
52%
466
35%
775
May21st to endNight
54%
388
0%
1164
0%
388
54%
388
28%
745
June1st to 10thNight
49%
360
0%
1080
0%
360
49%
360
25%
717
June11th to 20thNight
44%
360
0%
1080
0%
360
44%
360
20%
775
June21st to endNight
54%
360
0%
1080
0%
360
54%
360
23%
736
July1st to 10thNight
60%
350
0%
1050
0%
350
60%
350
34%
621
July11th to 20thNight
57%
348
0%
1044
0%
348
57%
348
28%
669
July21st to endNight
61%
394
2%
1253
2%
372
62%
372
29%
749
August1st to 10thNight
63%
519
6%
1407
3%
517
64%
517
35%
868
August11th to 20thNight
56%
534
13%
1424
6%
534
60%
534
37%
876
August21st to endNight
58%
594
12%
1740
9%
594
60%
594
29%
1097
September1st to 10thNight
49%
540
11%
1800
10%
540
52%
540
24%
1127
September11th to 20thNight
47%
540
15%
1800
13%
540
52%
540
23%
1160
September21st to endNight
48%
605
20%
2031
18%
605
54%
605
29%
1188
October1st to 10thNight
32%
720
16%
2160
10%
720
38%
720
20%
1528
October11th to 20thNight
35%
819
12%
2259
6%
819
39%
819
19%
1657
October21st to endNight
25%
990
10%
2650
3%
990
30%
990
13%
2129
November1st to 10thNight
23%
925
8%
2591
4%
925
26%
925
9%
2193
November11th to 20thNight
26%
950
7%
2850
3%
950
29%
950
9%
2382
November21st to endNight
25%
950
6%
2932
3%
950
29%
950
10%
2390
December1st to 10thNight
36%
950
7%
3040
5%
950
40%
950
11%
2424
December11th to 20thNight
29%
949
8%
3694
4%
949
34%
949
8%
2824
December21st to endNight
38%
1028
7%
5291
8%
1026
41%
1026
11%
2967

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%9%48%7%46%5%6%7%33%
74523
Night
10%10%5%9%8%46%6%6%7%30%
75233
TransparencyDay
49%415%23%8%1
74190
Night
53%413%21%8%1
75085
SeeingDay
15%421%32%21%6%
14655
Night
17%423%35%18%3
24010

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
10%13%7%10%11%6%7%46%5%21%
1139
11th to 20thDay
9%14%5%12%11%5%7%7%6%7%16%
1188
21st to endDay
9%15%8%12%7%46%7%6%6%21%
1407
February1st to 10thDay
5%8%5%11%9%7%12%7%7%7%22%
1440
11th to 20thDay
7%11%5%8%8%5%9%7%7%6%27%
1521
21st to endDay
49%5%11%9%6%7%5%7%8%30%
1361
March1st to 10thDay
9%10%48%8%6%5%6%6%7%33%
1800
11th to 20thDay
10%10%46%8%6%7%5%5%6%33%
1889
21st to endDay
9%11%48%7%36%5%5%8%34%
2335
April1st to 10thDay
7%8%47%6%46%6%48%39%
2160
11th to 20thDay
10%10%49%7%46%6%6%8%31%
2312
21st to endDay
12%8%48%7%46%5%6%6%34%
2520
May1st to 10thDay
12%8%46%7%35%5%6%8%37%
2520
11th to 20thDay
10%7%35%5%346%6%6%44%
2658
21st to endDay
16%7%35%5%35%5%5%8%38%
3111
June1st to 10thDay
14%8%37%7%45%5%6%8%33%
2880
11th to 20thDay
19%8%37%6%46%5%7%8%27%
2880
21st to endDay
16%8%36%6%46%6%8%7%31%
2880
July1st to 10thDay
12%5%25%5%46%6%7%9%39%
2880
11th to 20thDay
13%5%36%5%46%6%7%9%37%
2880
21st to endDay
12%5%26%5%47%6%7%9%38%
2987
August1st to 10thDay
11%6%26%5%36%6%6%9%40%
2525
11th to 20thDay
11%6%25%6%36%6%7%9%39%
2477
21st to endDay
14%7%35%6%35%5%6%9%38%
2612
September1st to 10thDay
13%7%27%7%45%6%6%7%36%
2160
11th to 20thDay
16%10%47%6%35%5%6%7%32%
2160
21st to endDay
14%9%37%5%335%5%8%39%
1927
October1st to 10thDay
18%12%46%6%3446%6%32%
1800
11th to 20thDay
13%13%6%9%6%34446%33%
1682
21st to endDay
18%18%6%13%5%335%45%20%
1702
November1st to 10thDay
17%19%8%11%8%4444416%
1486
11th to 20thDay
13%15%6%14%11%5%6%5%4417%
1330
21st to endDay
10%16%9%14%9%45%45%5%18%
1245
December1st to 10thDay
6%12%6%13%10%6%9%6%6%7%18%
1140
11th to 20thDay
11%13%411%10%5%6%6%7%5%21%
1439
21st to endDay
48%47%9%46%5%7%6%41%
2090
January1st to 10thNight
9%15%6%11%9%5%7%6%6%422%
3026
11th to 20thNight
7%14%7%11%10%6%7%7%6%7%18%
2844
21st to endNight
11%16%6%10%9%5%7%8%5%5%18%
2948
February1st to 10thNight
7%10%5%10%9%5%9%8%8%7%23%
2520
11th to 20thNight
6%10%6%10%9%48%9%5%5%29%
2343
21st to endNight
49%5%9%11%6%6%6%6%7%31%
1895
March1st to 10thNight
9%10%5%10%8%6%6%46%6%30%
2160
11th to 20thNight
8%12%5%9%8%45%6%5%7%30%
2066
21st to endNight
9%11%48%6%5%6%5%6%8%33%
2021
April1st to 10thNight
8%11%38%7%46%5%6%7%36%
1800
11th to 20thNight
13%8%48%8%35%5%5%7%34%
1597
21st to endNight
12%10%45%6%36%5%48%35%
1440
May1st to 10thNight
13%9%45%445%6%6%6%37%
1440
11th to 20thNight
9%6%35%5%36%6%5%6%47%
1232
21st to endNight
18%6%25%43435%8%40%
1164
June1st to 10thNight
13%6%36%7%45%5%7%9%34%
1080
11th to 20thNight
17%6%38%7%36%5%7%9%28%
1080
21st to endNight
16%8%37%5%35%5%7%8%33%
1080
July1st to 10thNight
10%5%25%5%26%47%13%41%
1080
11th to 20thNight
12%5%36%6%45%5%6%10%39%
1080
21st to endNight
12%5%35%5%36%5%6%9%43%
1327
August1st to 10thNight
13%4245%25%6%5%9%45%
1414
11th to 20thNight
10%4245%35%5%7%9%45%
1424
21st to endNight
13%4345%446%7%9%41%
1740
September1st to 10thNight
12%7%36%7%25%5%6%9%39%
1800
11th to 20thNight
15%8%26%5%345%6%8%37%
1800
21st to endNight
11%5%25%5%345%7%9%44%
2031
October1st to 10thNight
20%12%37%424347%33%
2160
11th to 20thNight
13%14%5%8%6%345%5%7%32%
2259
21st to endNight
14%15%6%12%7%45%5%5%5%23%
2650
November1st to 10thNight
16%17%7%13%9%45%446%16%
2591
11th to 20thNight
12%14%6%14%11%6%5%44419%
2850
21st to endNight
9%15%7%12%11%5%6%6%5%5%20%
2932
December1st to 10thNight
7%12%6%13%12%6%8%7%5%6%19%
3040
11th to 20thNight
10%14%5%12%9%5%6%7%5%6%21%
3753
21st to endNight
5%8%47%8%5%5%6%6%6%41%
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
63%412%15%5%
1139
11th to 20thDay
65%413%12%6%
1188
21st to endDay
62%49%16%9%
1407
February1st to 10thDay
57%411%19%8%
1440
11th to 20thDay
54%313%22%8%
1530
21st to endDay
50%316%23%8%1
1361
March1st to 10thDay
50%313%26%6%2
1800
11th to 20thDay
52%414%23%7%1
1890
21st to endDay
46%314%29%7%1
2335
April1st to 10thDay
43%413%26%13%1
2160
11th to 20thDay
49%313%21%12%1
2312
21st to endDay
48%310%26%11%2
2520
May1st to 10thDay
45%38%28%16%
2520
11th to 20thDay
38%312%27%18%3
2662
21st to endDay
44%312%25%15%2
3112
June1st to 10thDay
47%311%25%12%1
2880
11th to 20thDay
52%314%22%8%1
2880
21st to endDay
47%416%24%7%1
2880
July1st to 10thDay
38%319%30%10%1
2801
11th to 20thDay
41%420%30%6%
2793
21st to endDay
40%5%23%28%4
2821
August1st to 10thDay
37%325%29%4
2508
11th to 20thDay
38%426%27%4
2477
21st to endDay
42%425%25%3
2612
September1st to 10thDay
44%5%21%20%9%1
2160
11th to 20thDay
51%419%22%5%
2160
21st to endDay
44%320%25%7%1
1927
October1st to 10thDay
53%314%22%7%
1800
11th to 20thDay
54%414%23%6%
1682
21st to endDay
70%310%14%4
1702
November1st to 10thDay
74%38%11%4
1486
11th to 20thDay
73%411%10%2
1330
21st to endDay
69%413%11%3
1245
December1st to 10thDay
64%6%11%14%5%
1140
11th to 20thDay
63%417%12%3
1440
21st to endDay
43%313%25%15%1
2090
January1st to 10thNight
64%5%12%16%3
3026
11th to 20thNight
64%412%16%4
2844
21st to endNight
66%5%8%16%6%
2948
February1st to 10thNight
54%6%14%17%9%
2520
11th to 20thNight
55%414%21%7%
2344
21st to endNight
51%411%24%9%
1895
March1st to 10thNight
55%311%22%8%1
2160
11th to 20thNight
53%311%23%9%1
2066
21st to endNight
49%310%27%9%1
2021
April1st to 10thNight
47%311%23%14%2
1800
11th to 20thNight
50%38%21%16%2
1597
21st to endNight
48%49%25%12%3
1440
May1st to 10thNight
44%37%26%18%1
1440
11th to 20thNight
37%37%26%21%5%
1232
21st to endNight
43%38%28%16%2
1164
June1st to 10thNight
45%412%22%15%2
1080
11th to 20thNight
51%5%11%21%10%1
1080
21st to endNight
49%314%23%9%1
1080
July1st to 10thNight
35%417%33%11%
1050
11th to 20thNight
41%420%28%6%
1044
21st to endNight
39%422%29%7%
1253
August1st to 10thNight
35%5%21%32%7%
1407
11th to 20thNight
34%5%24%33%4
1424
21st to endNight
39%5%24%27%5%
1740
September1st to 10thNight
42%419%24%9%1
1800
11th to 20thNight
45%419%26%6%
1800
21st to endNight
37%418%31%9%1
2031
October1st to 10thNight
53%314%24%6%
2160
11th to 20thNight
54%413%22%7%
2259
21st to endNight
64%412%15%5%
2650
November1st to 10thNight
72%49%11%3
2591
11th to 20thNight
71%412%10%2
2850
21st to endNight
67%5%12%13%2
2932
December1st to 10thNight
66%412%14%3
3040
11th to 20thNight
64%414%12%4
3751
21st to endNight
44%314%27%11%1
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
9%429%33%21%4
180
11th to 20thDay
15%326%37%13%6%
166
21st to endDay
15%5%24%36%16%4
186
February1st to 10thDay
6%5%30%38%18%4
240
11th to 20thDay
8%5%25%38%20%5%
240
21st to endDay
7%5%25%29%30%4
198
March1st to 10thDay
12%322%28%27%8%
240
11th to 20thDay
11%421%35%24%5%
330
21st to endDay
15%326%32%18%5%
462
April1st to 10thDay
11%5%23%40%15%6%
420
11th to 20thDay
14%322%35%19%6%
496
21st to endDay
15%423%35%20%5%
600
May1st to 10thDay
14%420%35%21%6%
603
11th to 20thDay
12%421%33%24%6%
625
21st to endDay
16%318%33%23%7%
679
June1st to 10thDay
18%5%21%30%21%5%
630
11th to 20thDay
22%420%31%20%4
630
21st to endDay
19%217%30%23%9%
630
July1st to 10thDay
15%318%31%26%7%
621
11th to 20thDay
14%318%30%26%9%
618
21st to endDay
13%216%29%29%10%
684
August1st to 10thDay
13%415%29%30%10%
626
11th to 20thDay
13%220%31%24%9%
615
21st to endDay
16%419%32%22%8%
587
September1st to 10thDay
16%8%24%31%18%3
450
11th to 20thDay
19%421%34%17%6%
450
21st to endDay
15%6%24%30%21%4
284
October1st to 10thDay
20%5%23%34%17%1
270
11th to 20thDay
20%10%28%26%12%4
270
21st to endDay
25%5%24%26%15%4
297
November1st to 10thDay
24%5%22%31%16%2
270
11th to 20thDay
18%9%34%30%9%
270
21st to endDay
18%6%31%34%9%2
230
December1st to 10thDay
12%326%29%24%6%
180
11th to 20thDay
15%6%32%33%13%1
180
21st to endDay
11%225%34%20%8%
198
January1st to 10thNight
16%5%27%33%17%2
950
11th to 20thNight
14%328%39%14%2
918
21st to endNight
19%6%27%34%12%2
990
February1st to 10thNight
12%329%36%16%4
900
11th to 20thNight
10%324%39%20%4
774
21st to endNight
7%320%41%26%3
592
March1st to 10thNight
14%321%37%21%3
720
11th to 20thNight
14%327%39%15%2
720
21st to endNight
15%222%31%26%5%
635
April1st to 10thNight
16%120%40%21%3
540
11th to 20thNight
17%222%39%17%4
533
21st to endNight
17%224%39%17%2
540
May1st to 10thNight
17%319%41%19%3
540
11th to 20thNight
13%322%37%20%4
466
21st to endNight
20%313%40%20%4
389
June1st to 10thNight
17%318%33%26%3
360
11th to 20thNight
21%319%32%21%4
360
21st to endNight
19%314%32%28%5%
360
July1st to 10thNight
13%215%34%33%3
350
11th to 20thNight
15%413%36%27%6%
348
21st to endNight
16%213%32%28%9%
394
August1st to 10thNight
15%213%29%32%10%
519
11th to 20thNight
12%322%31%25%7%
534
21st to endNight
16%413%39%23%5%
594
September1st to 10thNight
17%321%32%25%2
540
11th to 20thNight
21%419%37%18%1
540
21st to endNight
14%429%37%15%1
605
October1st to 10thNight
29%6%23%27%13%1
720
11th to 20thNight
22%8%25%30%13%3
819
21st to endNight
22%10%28%25%12%2
990
November1st to 10thNight
26%8%26%27%12%2
925
11th to 20thNight
19%7%29%34%10%2
950
21st to endNight
16%6%34%32%10%2
950
December1st to 10thNight
11%425%38%18%4
950
11th to 20thNight
16%5%27%32%16%3
950
21st to endNight
13%320%39%21%4
1045
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