Saskatoon
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Saskatoon clear sky chart from 2005-11-05 to 2017-08-12.

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
41%
15466
12%
46372
8%
15437
45%
15437
21%
31996

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 15thNight
32%
895
7%
2685
4%
895
35%
895
15%
2026
January16th to endNight
26%
960
12%
2816
5%
960
32%
960
14%
2119
February1st to 15thNight
38%
777
11%
2368
8%
777
42%
777
17%
1740
February16th to endNight
44%
632
12%
2036
9%
632
48%
632
19%
1431
March1st to 15thNight
40%
720
14%
2112
10%
720
44%
720
21%
1493
March16th to endNight
37%
695
13%
2039
10%
695
41%
695
19%
1475
April1st to 15thNight
40%
539
15%
1795
10%
539
47%
539
24%
1133
April16th to endNight
39%
540
14%
1508
10%
540
42%
540
21%
1073
May1st to 15thNight
46%
539
12%
1439
7%
539
49%
539
29%
954
May16th to endNight
45%
454
5%
1348
4%
453
48%
453
26%
899
June1st to 15thNight
46%
360
0%
1080
0%
360
46%
360
21%
740
June16th to endNight
51%
360
0%
1080
0%
360
51%
360
26%
701
July1st to 15thNight
60%
340
0%
1117
0%
340
60%
340
34%
626
July16th to endNight
63%
417
8%
1277
6%
392
65%
392
40%
662
August1st to 15thNight
67%
527
12%
1400
7%
524
70%
524
43%
807
August16th to endNight
59%
525
19%
1582
14%
525
64%
525
38%
876
September1st to 15thNight
56%
495
17%
1650
17%
495
59%
495
29%
979
September16th to endNight
50%
563
23%
1801
18%
563
59%
563
38%
974
October1st to 15thNight
44%
660
19%
1980
12%
660
50%
660
26%
1281
October16th to endNight
41%
833
16%
2274
9%
833
45%
833
24%
1570
November1st to 15thNight
34%
875
15%
2450
8%
875
39%
875
19%
1798
November16th to endNight
32%
900
10%
2607
5%
900
37%
900
16%
1966
December1st to 15thNight
32%
900
6%
2856
4%
900
34%
900
12%
2276
December16th to endNight
34%
960
9%
3072
6%
960
38%
960
12%
2397

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%8%47%6%35%5%5%7%33%
47636
Night
10%9%48%6%35%5%5%7%34%
46522
Cloud CoverDay
13%8%36%5%35%5%5%7%34%
47637
Night
10%8%47%6%35%5%5%7%34%
46524
TransparencyDay
48%5%17%21%6%
47288
Night
48%5%16%21%7%
46374
SeeingDay
15%6%23%29%19%5%
6039
Night
14%5%25%35%17%2
15481

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 15thDay
9%13%8%10%8%45%5%6%7%20%
1250
16th to endDay
7%9%5%10%8%47%6%5%7%26%
1407
February1st to 15thDay
8%12%7%10%8%5%6%6%6%6%20%
1503
16th to endDay
8%12%7%11%10%47%6%5%6%19%
1438
March1st to 15thDay
8%14%6%9%8%46%5%46%24%
1845
16th to endDay
10%14%5%8%7%35%45%7%26%
2184
April1st to 15thDay
11%11%5%6%5%36%5%6%6%31%
2150
16th to endDay
16%10%47%5%34436%32%
2451
May1st to 15thDay
13%6%26%5%36%5%6%6%38%
2511
16th to endDay
17%6%36%6%35%5%6%7%31%
2763
June1st to 15thDay
17%7%36%5%45%5%6%8%30%
2880
16th to endDay
16%7%37%6%35%5%6%8%29%
2880
July1st to 15thDay
9%4244345%6%9%43%
2773
16th to endDay
7%324435%5%6%9%45%
2804
August1st to 15thDay
11%5%25%5%346%6%9%39%
2466
16th to endDay
11%5%1342445%9%46%
2268
September1st to 15thDay
12%5%15%5%2336%8%45%
1980
16th to endDay
11%31432435%9%49%
1829
October1st to 15thDay
18%9%25%423447%36%
1650
16th to endDay
13%11%46%43445%7%32%
1587
November1st to 15thDay
15%14%37%5%24345%32%
1408
16th to endDay
10%14%7%10%7%5%6%5%35%23%
1353
December1st to 15thDay
9%13%7%11%9%6%6%45%8%16%
1104
16th to endDay
7%15%8%13%9%38%6%45%16%
1152
January1st to 15thNight
8%11%5%9%9%47%6%5%7%23%
2685
16th to endNight
7%11%6%10%9%46%5%5%7%26%
2816
February1st to 15thNight
6%9%5%13%9%37%5%5%7%26%
2358
16th to endNight
6%10%7%10%8%35%5%6%7%28%
2036
March1st to 15thNight
9%8%49%6%35%5%5%6%32%
2112
16th to endNight
10%11%49%6%3445%7%30%
2036
April1st to 15thNight
9%8%36%6%3435%7%39%
1795
16th to endNight
14%11%25%6%46%346%33%
1508
May1st to 15thNight
13%5%26%435%5%5%7%40%
1439
16th to endNight
14%6%24435%5%5%7%38%
1348
June1st to 15thNight
15%6%26%6%35%5%7%6%33%
1080
16th to endNight
14%6%26%435%5%6%8%38%
1080
July1st to 15thNight
6%325%435%5%7%9%46%
1185
16th to endNight
6%2133335%5%8%55%
1364
August1st to 15thNight
5%3133246%6%9%53%
1408
16th to endNight
9%32332345%9%52%
1582
September1st to 15thNight
12%5%15%43345%7%44%
1650
16th to endNight
10%413323348%54%
1801
October1st to 15thNight
13%8%35%43445%7%40%
1980
16th to endNight
11%10%37%5%34447%38%
2274
November1st to 15thNight
14%12%5%6%6%35%446%30%
2450
16th to endNight
8%13%5%10%8%44448%26%
2607
December1st to 15thNight
10%13%7%10%8%45%5%6%6%19%
2856
16th to endNight
6%11%6%12%9%5%8%6%6%7%19%
3072

Percentage Cloud Cover SW (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 15thDay
9%13%7%11%7%45%7%5%8%19%
1250
16th to endDay
7%9%6%10%9%47%6%6%6%26%
1407
February1st to 15thDay
8%13%6%11%8%46%6%6%6%21%
1503
16th to endDay
8%11%7%12%9%5%7%6%46%20%
1438
March1st to 15thDay
14%14%5%8%7%36%436%25%
1845
16th to endDay
15%11%47%6%35%446%28%
2185
April1st to 15thDay
10%11%46%6%35%5%5%7%34%
2150
16th to endDay
15%11%46%5%33336%35%
2451
May1st to 15thDay
16%6%2443445%6%40%
2511
16th to endDay
20%5%25%5%3445%7%35%
2763
June1st to 15thDay
16%7%36%5%35%46%7%33%
2880
16th to endDay
15%6%36%6%35%5%5%7%34%
2880
July1st to 15thDay
9%414435%5%7%9%43%
2773
16th to endDay
8%324435%5%7%9%46%
2804
August1st to 15thDay
22%5%2342445%8%36%
2466
16th to endDay
21%41331345%8%42%
2268
September1st to 15thDay
12%5%25%5%2345%9%44%
1980
16th to endDay
11%413324448%49%
1829
October1st to 15thDay
18%8%25%42335%7%36%
1650
16th to endDay
13%12%36%5%3446%7%31%
1587
November1st to 15thDay
14%14%47%5%23345%33%
1408
16th to endDay
11%12%7%10%7%5%6%44424%
1353
December1st to 15thDay
9%13%6%12%8%7%7%5%5%7%16%
1104
16th to endDay
6%15%8%13%9%38%6%5%416%
1152
January1st to 15thNight
9%11%5%10%8%47%6%5%7%22%
2685
16th to endNight
7%11%5%11%9%45%5%5%7%25%
2816
February1st to 15thNight
7%9%5%12%8%46%5%5%6%27%
2358
16th to endNight
6%10%6%9%8%35%5%6%8%29%
2036
March1st to 15thNight
15%6%48%5%35%445%34%
2112
16th to endNight
16%9%47%5%345%5%6%32%
2039
April1st to 15thNight
9%7%35%7%3445%7%41%
1795
16th to endNight
14%10%35%6%45%446%35%
1508
May1st to 15thNight
14%5%25%5%25%5%6%6%40%
1439
16th to endNight
15%6%34425%5%6%7%38%
1347
June1st to 15thNight
15%5%36%6%35%6%6%7%33%
1080
16th to endNight
13%6%35%425%47%9%36%
1080
July1st to 15thNight
6%3244345%7%9%46%
1185
16th to endNight
6%3133235%5%8%56%
1364
August1st to 15thNight
8%3123245%6%8%52%
1408
16th to endNight
14%32332336%8%49%
1582
September1st to 15thNight
12%425%42445%7%45%
1650
16th to endNight
9%31331335%7%54%
1801
October1st to 15thNight
13%7%35%5%2445%7%39%
1980
16th to endNight
11%10%37%5%34447%37%
2274
November1st to 15thNight
13%11%46%5%34445%35%
2450
16th to endNight
9%12%6%8%6%44446%32%
2607
December1st to 15thNight
10%12%6%11%8%5%6%5%6%5%19%
2856
16th to endNight
7%11%5%12%9%5%7%7%5%7%19%
3072

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 15thDay
61%5%14%15%4
1250
16th to endDay
55%6%14%16%6%
1407
February1st to 15thDay
60%6%15%14%3
1503
16th to endDay
63%410%13%7%
1438
March1st to 15thDay
59%416%14%3
1845
16th to endDay
55%6%15%18%4
2185
April1st to 15thDay
50%6%14%19%8%
2150
16th to endDay
54%314%18%8%
2451
May1st to 15thDay
43%412%28%8%1
2511
16th to endDay
49%5%14%17%12%
2767
June1st to 15thDay
51%315%21%6%
2880
16th to endDay
50%6%17%20%4
2880
July1st to 15thDay
34%6%22%30%6%
2612
16th to endDay
33%6%25%29%4
2628
August1st to 15thDay
38%6%25%22%6%
2450
16th to endDay
32%5%22%31%7%
2268
September1st to 15thDay
37%419%26%11%1
1980
16th to endDay
33%319%31%10%1
1829
October1st to 15thDay
47%417%24%5%
1650
16th to endDay
50%318%23%3
1587
November1st to 15thDay
54%318%17%6%
1408
16th to endDay
63%5%15%13%2
1353
December1st to 15thDay
66%5%14%10%2
1104
16th to endDay
66%6%14%10%2
1152
January1st to 15thNight
58%5%17%15%3
2685
16th to endNight
56%6%14%16%6%
2816
February1st to 15thNight
55%414%20%5%
2369
16th to endNight
52%316%19%8%
2036
March1st to 15thNight
49%418%21%5%
2112
16th to endNight
51%5%15%19%6%
2039
April1st to 15thNight
42%414%23%13%1
1795
16th to endNight
50%411%18%11%3
1508
May1st to 15thNight
41%49%30%12%1
1440
16th to endNight
43%5%14%19%15%2
1348
June1st to 15thNight
47%5%12%23%10%
1080
16th to endNight
41%5%21%22%8%
1080
July1st to 15thNight
29%6%23%30%9%
1117
16th to endNight
25%427%33%7%
1277
August1st to 15thNight
25%6%29%29%8%
1400
16th to endNight
28%5%16%35%13%
1582
September1st to 15thNight
37%414%28%12%2
1650
16th to endNight
28%314%36%15%1
1801
October1st to 15thNight
43%317%26%9%
1980
16th to endNight
46%417%24%5%
2274
November1st to 15thNight
54%413%20%6%
2450
16th to endNight
56%5%18%15%3
2607
December1st to 15thNight
63%6%16%11%2
2856
16th to endNight
62%5%13%14%4
3072

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 15thDay
11%318%28%30%8%
60
16th to endDay
16%6%30%26%14%5%
75
February1st to 15thDay
18%425%37%13%
90
16th to endDay
18%323%39%9%4
81
March1st to 15thDay
22%8%37%21%8%1
135
16th to endDay
18%11%30%28%10%1
288
April1st to 15thDay
13%14%33%25%9%2
269
16th to endDay
23%8%22%25%18%2
381
May1st to 15thDay
17%7%21%34%16%3
468
16th to endDay
15%7%20%26%20%8%
517
June1st to 15thDay
16%7%26%30%15%3
495
16th to endDay
19%421%31%18%5%
495
July1st to 15thDay
11%218%30%26%9%
475
16th to endDay
7%426%27%26%8%
515
August1st to 15thDay
10%314%28%30%12%
474
16th to endDay
11%323%29%26%4
297
September1st to 15thDay
20%5%25%30%16%2
255
16th to endDay
13%7%25%32%16%5%
175
October1st to 15thDay
30%421%28%10%5%
90
16th to endDay
20%429%27%14%4
96
November1st to 15thDay
20%133%31%11%3
90
16th to endDay
22%7%18%23%18%8%
90
December1st to 15thDay
4321%43%15%10%
64
16th to endDay
14%23%45%9%7%
64
January1st to 15thNight
14%5%29%34%13%2
900
16th to endNight
12%7%35%32%9%1
960
February1st to 15thNight
10%324%38%19%2
785
16th to endNight
10%322%36%22%4
632
March1st to 15thNight
12%5%26%37%15%2
720
16th to endNight
14%7%27%35%13%2
695
April1st to 15thNight
10%8%29%36%13%2
539
16th to endNight
21%6%22%32%14%1
540
May1st to 15thNight
14%5%24%39%15%
540
16th to endNight
18%325%32%16%3
455
June1st to 15thNight
17%5%21%34%18%2
360
16th to endNight
17%417%34%23%2
360
July1st to 15thNight
7%221%40%25%2
340
16th to endNight
7%320%42%23%1
417
August1st to 15thNight
8%216%35%33%3
527
16th to endNight
11%221%39%23%1
525
September1st to 15thNight
15%316%38%24%2
495
16th to endNight
12%428%37%15%1
563
October1st to 15thNight
18%424%35%16%2
660
16th to endNight
17%425%39%12%1
833
November1st to 15thNight
19%6%29%31%11%1
875
16th to endNight
16%6%29%34%11%2
900
December1st to 15thNight
14%6%23%34%18%2
900
16th to endNight
9%427%33%20%4
960
Page generated at 2017-08-13 12:16:21. Version ac04

Copyright 2017 A. Danko


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