Moose Jaw
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Moose Jaw 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
39%
15649
12%
46354
8%
15611
43%
15611
21%
32036

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
29%
895
8%
2685
4%
895
33%
895
15%
2004
January16th to endNight
22%
960
12%
2693
5%
960
29%
960
15%
2052
February1st to 15thNight
31%
774
8%
2366
6%
774
35%
774
15%
1786
February16th to endNight
39%
632
10%
1995
7%
632
43%
632
15%
1506
March1st to 15thNight
35%
720
12%
2139
7%
720
41%
720
20%
1508
March16th to endNight
33%
675
12%
2019
8%
675
38%
675
14%
1540
April1st to 15thNight
41%
539
15%
1798
10%
539
48%
539
23%
1128
April16th to endNight
39%
540
14%
1563
9%
540
43%
540
21%
1098
May1st to 15thNight
44%
539
12%
1440
6%
539
47%
539
29%
953
May16th to endNight
40%
563
8%
1498
5%
561
42%
561
22%
1073
June1st to 15thNight
40%
376
4%
1111
3%
376
43%
376
25%
721
June16th to endNight
50%
360
3%
1080
3%
360
52%
360
29%
668
July1st to 15thNight
65%
340
5%
1181
5%
340
67%
340
35%
630
July16th to endNight
62%
523
15%
1375
9%
490
65%
490
47%
741
August1st to 15thNight
66%
527
16%
1400
11%
524
69%
524
43%
808
August16th to endNight
61%
525
23%
1617
16%
525
67%
525
42%
851
September1st to 15thNight
57%
495
19%
1650
18%
495
61%
495
30%
958
September16th to endNight
49%
530
24%
1790
21%
530
57%
530
32%
1000
October1st to 15thNight
41%
660
19%
1980
11%
660
47%
660
26%
1267
October16th to endNight
37%
841
17%
2249
8%
841
44%
841
25%
1565
November1st to 15thNight
31%
875
15%
2425
6%
875
38%
875
21%
1729
November16th to endNight
29%
900
13%
2567
6%
900
35%
900
17%
1936
December1st to 15thNight
25%
900
5%
2715
3%
900
28%
900
10%
2213
December16th to endNight
30%
960
10%
3018
5%
960
35%
960
12%
2301

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
11%8%36%6%35%5%5%7%35%
47645
Night
9%9%47%6%35%45%7%36%
46512
Cloud CoverDay
11%8%46%6%35%5%5%7%35%
47646
Night
9%8%47%6%35%5%5%7%36%
46514
TransparencyDay
47%7%16%21%7%
47307
Night
46%7%15%20%9%
46354
SeeingDay
14%7%28%28%16%3
6039
Night
13%6%30%33%13%1
15663

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
8%10%5%11%7%5%6%6%5%6%25%
1253
16th to endDay
412%6%10%8%46%5%5%7%27%
1530
February1st to 15thDay
8%13%6%11%10%48%45%422%
1507
16th to endDay
8%14%6%11%10%5%5%6%6%5%19%
1479
March1st to 15thDay
7%13%8%10%8%5%5%5%5%6%23%
1821
16th to endDay
11%11%5%8%7%46%6%6%7%25%
2204
April1st to 15thDay
10%8%47%6%46%46%8%32%
2150
16th to endDay
16%10%47%5%44445%31%
2397
May1st to 15thDay
12%7%345%35%6%5%6%38%
2511
16th to endDay
19%6%36%6%35%5%6%8%30%
2616
June1st to 15thDay
20%6%25%6%345%47%31%
2847
16th to endDay
12%6%25%5%35%5%7%8%38%
2880
July1st to 15thDay
8%4145%25%46%9%47%
2706
16th to endDay
5%31342445%9%54%
2698
August1st to 15thDay
9%425%4345%5%9%45%
2466
16th to endDay
10%324324347%53%
2229
September1st to 15thDay
14%5%24414447%46%
1980
16th to endDay
12%423314448%49%
1840
October1st to 15thDay
15%9%46%5%23445%38%
1650
16th to endDay
11%11%47%5%25%447%35%
1612
November1st to 15thDay
9%9%5%6%5%35%347%38%
1432
16th to endDay
11%11%49%7%47%5%45%28%
1392
December1st to 15thDay
7%15%6%12%11%5%7%6%45%15%
1242
16th to endDay
10%12%6%10%9%5%7%45%6%20%
1203
January1st to 15thNight
7%11%5%9%8%46%5%5%7%27%
2685
16th to endNight
5%12%6%10%9%45%5%6%7%26%
2693
February1st to 15thNight
7%11%6%9%8%46%5%47%27%
2355
16th to endNight
8%10%5%10%8%46%5%5%7%26%
1995
March1st to 15thNight
7%8%5%7%7%36%6%6%8%33%
2139
16th to endNight
12%11%5%9%7%35%5%47%26%
2016
April1st to 15thNight
9%7%45%425%5%5%8%41%
1798
16th to endNight
11%10%47%6%34446%35%
1563
May1st to 15thNight
13%7%24425%45%9%41%
1439
16th to endNight
18%6%26%425%46%8%34%
1498
June1st to 15thNight
14%5%14426%46%7%41%
1111
16th to endNight
10%425%42445%9%45%
1080
July1st to 15thNight
431442445%9%53%
1251
16th to endNight
421331335%8%61%
1470
August1st to 15thNight
6%2133145%6%8%55%
1408
16th to endNight
7%32421335%7%58%
1617
September1st to 15thNight
11%426%43345%7%48%
1650
16th to endNight
11%423323447%52%
1790
October1st to 15thNight
12%8%34423346%44%
1980
16th to endNight
9%10%47%6%25%36%6%37%
2249
November1st to 15thNight
12%9%37%5%2435%6%37%
2425
16th to endNight
9%12%5%9%7%45%45%7%29%
2567
December1st to 15thNight
11%13%7%12%8%46%5%5%6%18%
2715
16th to endNight
7%12%6%11%8%5%6%5%5%6%24%
3018

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
8%10%6%11%7%5%6%6%46%25%
1253
16th to endDay
5%12%6%10%8%46%5%5%6%27%
1530
February1st to 15thDay
8%12%7%9%11%5%7%45%422%
1507
16th to endDay
8%14%6%11%10%46%6%6%5%19%
1479
March1st to 15thDay
8%13%7%10%8%5%5%5%5%7%23%
1821
16th to endDay
11%12%5%8%7%36%6%6%7%25%
2205
April1st to 15thDay
10%8%5%7%5%45%5%6%8%32%
2150
16th to endDay
16%11%47%6%35%445%30%
2397
May1st to 15thDay
12%7%35%6%45%5%5%6%37%
2511
16th to endDay
19%6%36%6%35%5%6%8%30%
2616
June1st to 15thDay
20%6%35%6%35%5%5%7%31%
2847
16th to endDay
12%5%245%36%5%6%9%37%
2880
July1st to 15thDay
8%32443446%8%47%
2706
16th to endDay
5%32442445%9%53%
2698
August1st to 15thDay
9%424425%5%6%8%45%
2466
16th to endDay
10%413424347%53%
2229
September1st to 15thDay
14%5%24413447%46%
1980
16th to endDay
12%5%14323448%49%
1840
October1st to 15thDay
16%10%45%423346%38%
1650
16th to endDay
12%11%48%5%24447%35%
1612
November1st to 15thDay
9%9%5%6%5%44446%37%
1432
16th to endDay
11%12%48%7%47%445%28%
1392
December1st to 15thDay
7%15%7%12%11%5%8%7%5%415%
1242
16th to endDay
10%12%7%10%9%5%7%5%47%19%
1203
January1st to 15thNight
7%11%5%9%7%46%6%5%7%28%
2685
16th to endNight
5%13%6%10%9%46%5%6%7%26%
2693
February1st to 15thNight
7%11%6%10%8%46%5%46%27%
2355
16th to endNight
8%10%5%11%8%47%6%5%7%25%
1995
March1st to 15thNight
7%8%5%7%7%26%6%6%8%33%
2139
16th to endNight
12%10%6%9%6%45%5%47%26%
2019
April1st to 15thNight
9%7%45%425%5%5%8%41%
1798
16th to endNight
11%10%5%6%6%35%45%6%35%
1563
May1st to 15thNight
13%7%24435%45%8%40%
1439
16th to endNight
17%6%25%5%3446%8%34%
1497
June1st to 15thNight
14%5%14435%46%8%41%
1111
16th to endNight
10%415%43445%9%45%
1080
July1st to 15thNight
43134245%6%9%52%
1251
16th to endNight
421331335%8%60%
1470
August1st to 15thNight
6%3123245%7%7%55%
1408
16th to endNight
7%323223447%58%
1617
September1st to 15thNight
10%325%433448%48%
1650
16th to endNight
10%423324347%52%
1790
October1st to 15thNight
12%9%24423347%44%
1980
16th to endNight
9%9%47%6%35%46%6%38%
2249
November1st to 15thNight
12%9%37%6%3445%6%37%
2425
16th to endNight
9%12%6%8%7%45%45%7%28%
2567
December1st to 15thNight
11%13%7%11%9%5%5%45%6%18%
2715
16th to endNight
7%12%6%11%9%46%5%5%7%23%
3018

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
56%8%14%16%4
1253
16th to endDay
55%8%14%15%4
1530
February1st to 15thDay
63%5%11%13%4
1507
16th to endDay
63%8%12%10%6%
1479
March1st to 15thDay
58%8%16%13%2
1821
16th to endDay
55%9%16%14%3
2205
April1st to 15thDay
48%7%17%18%7%
2150
16th to endDay
55%5%14%16%6%1
2397
May1st to 15thDay
44%6%12%25%10%
2511
16th to endDay
51%7%13%16%9%
2620
June1st to 15thDay
51%7%14%19%6%
2847
16th to endDay
41%8%18%24%5%
2880
July1st to 15thDay
31%8%20%28%10%
2547
16th to endDay
27%8%19%30%12%1
2530
August1st to 15thDay
33%9%22%24%7%1
2450
16th to endDay
30%6%14%31%13%2
2229
September1st to 15thDay
37%6%16%25%14%
1980
16th to endDay
32%6%13%33%12%1
1840
October1st to 15thDay
47%5%15%23%8%
1650
16th to endDay
48%6%18%22%4
1612
November1st to 15thDay
47%5%17%19%8%
1432
16th to endDay
57%8%15%15%3
1392
December1st to 15thDay
69%8%11%9%1
1242
16th to endDay
63%5%17%11%1
1203
January1st to 15thNight
53%8%16%17%4
2685
16th to endNight
54%7%16%14%5%
2693
February1st to 15thNight
56%6%14%15%6%
2366
16th to endNight
55%8%14%14%6%
1995
March1st to 15thNight
46%8%19%19%5%
2139
16th to endNight
56%7%14%15%5%
2019
April1st to 15thNight
40%6%16%23%11%1
1798
16th to endNight
48%6%13%18%10%3
1563
May1st to 15thNight
40%5%14%23%15%1
1440
16th to endNight
46%8%12%18%12%1
1498
June1st to 15thNight
40%7%16%22%11%
1111
16th to endNight
34%8%21%27%7%
1080
July1st to 15thNight
25%8%21%30%12%1
1181
16th to endNight
21%6%15%37%17%2
1375
August1st to 15thNight
24%7%21%34%10%
1400
16th to endNight
24%5%15%31%19%3
1617
September1st to 15thNight
34%5%12%28%18%
1650
16th to endNight
31%5%11%31%18%1
1790
October1st to 15thNight
39%5%16%24%11%
1980
16th to endNight
45%5%17%23%6%1
2249
November1st to 15thNight
48%6%16%17%9%1
2425
16th to endNight
54%7%17%16%4
2567
December1st to 15thNight
65%7%14%11%1
2715
16th to endNight
58%6%15%15%3
3018

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
10%5%15%36%30%3
60
16th to endDay
15%10%30%32%9%1
95
February1st to 15thDay
20%435%32%7%
90
16th to endDay
20%435%28%7%2
81
March1st to 15thDay
21%9%40%20%6%1
111
16th to endDay
20%10%41%17%9%
288
April1st to 15thDay
14%18%37%21%6%1
269
16th to endDay
20%10%27%25%16%
384
May1st to 15thDay
13%8%30%30%13%2
468
16th to endDay
17%9%21%28%14%8%
517
June1st to 15thDay
17%8%30%24%14%4
495
16th to endDay
12%9%28%31%14%3
495
July1st to 15thDay
9%420%34%26%5%
475
16th to endDay
4427%35%24%3
515
August1st to 15thDay
10%419%33%24%7%
474
16th to endDay
11%7%21%31%22%5%
297
September1st to 15thDay
18%7%27%27%16%1
255
16th to endDay
13%9%24%30%21%1
153
October1st to 15thDay
33%430%18%8%4
90
16th to endDay
23%8%22%28%14%2
96
November1st to 15thDay
12%341%28%13%1
90
16th to endDay
16%10%27%25%17%2
90
December1st to 15thDay
10%244%25%10%6%
87
16th to endDay
17%9%53%10%9%
64
January1st to 15thNight
13%9%35%31%10%
900
16th to endNight
11%11%39%28%6%1
960
February1st to 15thNight
11%7%32%33%13%2
782
16th to endNight
11%5%27%34%17%3
632
March1st to 15thNight
10%6%36%31%13%1
720
16th to endNight
15%8%28%34%11%
675
April1st to 15thNight
12%9%30%37%9%
539
16th to endNight
17%8%27%35%10%
540
May1st to 15thNight
17%5%26%34%15%1
540
16th to endNight
20%6%26%29%15%1
563
June1st to 15thNight
16%431%32%13%1
376
16th to endNight
11%5%25%38%18%
360
July1st to 15thNight
7%219%48%20%2
340
16th to endNight
5%224%43%21%1
523
August1st to 15thNight
8%218%39%27%3
527
16th to endNight
9%221%41%23%1
525
September1st to 15thNight
11%223%39%21%1
495
16th to endNight
12%428%39%13%1
530
October1st to 15thNight
17%6%29%29%15%1
660
16th to endNight
15%6%30%36%10%
841
November1st to 15thNight
15%9%34%28%9%1
875
16th to endNight
13%10%36%32%7%
900
December1st to 15thNight
17%6%33%28%12%2
900
16th to endNight
12%7%33%29%15%2
960
Page generated at 2017-08-13 12:16:44. Version ac04

Copyright 2017 A. Danko


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