Swift Current
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Swift Current clear sky chart from 2005-11-05 to 2017-10-06.

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
36%
15663
13%
46946
8%
15627
42%
15627
22%
31815

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
23%
895
10%
2685
5%
895
27%
895
16%
1961
January16th to endNight
22%
960
14%
2791
5%
960
31%
960
15%
2044
February1st to 15thNight
33%
717
10%
2300
6%
713
38%
713
16%
1651
February16th to endNight
34%
632
11%
2046
9%
632
39%
632
15%
1502
March1st to 15thNight
31%
720
13%
2073
6%
720
38%
720
21%
1461
March16th to endNight
31%
723
11%
2067
6%
723
36%
723
15%
1569
April1st to 15thNight
36%
539
14%
1789
9%
539
43%
539
23%
1158
April16th to endNight
35%
540
14%
1562
10%
540
39%
540
18%
1139
May1st to 15thNight
44%
539
13%
1440
7%
539
47%
539
29%
938
May16th to endNight
41%
489
7%
1424
5%
487
42%
487
20%
1018
June1st to 15thNight
42%
360
3%
1260
3%
360
43%
360
21%
809
June16th to endNight
51%
360
3%
1260
3%
360
52%
360
26%
752
July1st to 15thNight
58%
340
4%
1190
4%
340
60%
340
33%
644
July16th to endNight
60%
441
16%
1299
12%
414
64%
414
46%
641
August1st to 15thNight
63%
539
15%
1471
10%
536
66%
536
43%
836
August16th to endNight
60%
573
24%
1751
19%
573
65%
573
43%
931
September1st to 15thNight
54%
540
18%
1800
18%
540
57%
540
31%
1038
September16th to endNight
51%
647
26%
1974
18%
647
60%
647
35%
1127
October1st to 15thNight
36%
684
20%
2052
10%
684
45%
684
26%
1313
October16th to endNight
33%
790
17%
2228
8%
790
40%
790
23%
1511
November1st to 15thNight
27%
875
16%
2450
7%
875
34%
875
22%
1695
November16th to endNight
24%
900
14%
2520
5%
900
31%
900
18%
1822
December1st to 15thNight
24%
900
8%
2634
3%
900
29%
900
11%
2122
December16th to endNight
26%
960
12%
2880
4%
960
33%
960
15%
2133

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%5%35%45%7%36%
48283
Night
8%8%47%6%35%5%5%7%37%
47101
Cloud CoverDay
11%8%37%5%35%5%5%7%36%
48284
Night
8%8%47%6%35%5%5%7%37%
47103
TransparencyDay
45%7%15%22%8%
47939
Night
44%7%15%21%9%1
46949
SeeingDay
14%9%28%27%15%3
6204
Night
12%9%33%31%12%1
15671

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%10%8%5%7%445%27%
1253
16th to endDay
311%7%9%7%47%7%7%8%25%
1431
February1st to 15thDay
9%12%6%9%8%5%6%445%26%
1570
16th to endDay
7%13%5%11%7%45%5%7%6%25%
1428
March1st to 15thDay
5%10%6%11%8%5%5%6%5%7%27%
1886
16th to endDay
9%13%6%9%7%35%5%7%7%24%
2156
April1st to 15thDay
12%8%36%5%47%6%5%8%32%
2158
16th to endDay
16%11%47%5%2445%7%30%
2397
May1st to 15thDay
13%9%25%6%45%45%6%35%
2511
16th to endDay
21%8%35%5%35%45%7%28%
2688
June1st to 15thDay
19%6%36%5%25%46%7%30%
2700
16th to endDay
14%5%25%425%6%7%8%38%
2700
July1st to 15thDay
7%4145%345%6%9%48%
2700
16th to endDay
7%31332435%7%54%
2780
August1st to 15thDay
9%5%2442435%9%47%
2479
16th to endDay
9%213323449%54%
2450
September1st to 15thDay
13%6%25%423346%47%
2160
16th to endDay
11%5%2442335%7%49%
1984
October1st to 15thDay
15%9%35%314447%40%
1705
16th to endDay
10%9%45%425%46%7%38%
1629
November1st to 15thDay
7%11%5%7%5%3345%7%38%
1408
16th to endDay
9%12%49%7%36%5%46%29%
1440
December1st to 15thDay
8%10%6%12%9%5%7%5%5%6%21%
1326
16th to endDay
5%12%5%11%8%5%6%6%45%27%
1344
January1st to 15thNight
5%11%5%8%7%47%6%5%7%29%
2685
16th to endNight
49%410%8%47%6%7%7%28%
2791
February1st to 15thNight
5%11%6%8%6%5%6%5%5%8%29%
2292
16th to endNight
6%11%7%9%7%36%6%7%7%26%
2046
March1st to 15thNight
5%8%48%8%45%5%5%9%34%
2073
16th to endNight
9%11%5%8%8%45%5%5%8%27%
2064
April1st to 15thNight
9%8%46%5%35%6%5%7%38%
1789
16th to endNight
13%11%36%6%26%5%5%5%32%
1562
May1st to 15thNight
12%6%35%4335%5%7%42%
1439
16th to endNight
19%5%36%5%345%6%6%34%
1424
June1st to 15thNight
14%435%42446%8%38%
1260
16th to endNight
9%5%25%6%335%6%8%44%
1260
July1st to 15thNight
7%31432446%9%52%
1260
16th to endNight
4112314349%60%
1388
August1st to 15thNight
9%32222335%9%55%
1479
16th to endNight
8%41331245%7%57%
1751
September1st to 15thNight
11%42432444451%
1800
16th to endNight
8%323423449%53%
1974
October1st to 15thNight
12%8%35%423347%43%
2052
16th to endNight
9%9%46%5%35%448%38%
2228
November1st to 15thNight
9%11%46%43446%7%37%
2450
16th to endNight
7%10%49%6%45%5%6%7%32%
2520
December1st to 15thNight
7%12%6%12%9%6%7%5%5%6%21%
2634
16th to endNight
6%10%5%9%8%47%6%5%6%28%
2880

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
7%10%5%11%8%5%7%446%26%
1253
16th to endDay
311%6%9%6%48%8%7%8%25%
1431
February1st to 15thDay
9%11%7%9%9%46%446%26%
1570
16th to endDay
7%12%5%11%7%37%5%6%6%25%
1428
March1st to 15thDay
5%9%6%11%7%5%5%6%6%7%26%
1886
16th to endDay
9%12%6%10%7%35%5%6%8%23%
2157
April1st to 15thDay
12%8%36%6%36%6%6%7%32%
2158
16th to endDay
16%11%47%5%34446%30%
2397
May1st to 15thDay
12%8%46%6%35%45%6%34%
2511
16th to endDay
20%8%26%5%35%5%5%7%28%
2688
June1st to 15thDay
19%7%45%5%25%46%7%30%
2700
16th to endDay
13%5%25%5%35%6%6%10%36%
2700
July1st to 15thDay
7%4144345%6%9%47%
2700
16th to endDay
6%313424448%54%
2780
August1st to 15thDay
9%5%25%5%2446%8%46%
2479
16th to endDay
9%213323449%54%
2450
September1st to 15thDay
13%6%24323447%47%
2160
16th to endDay
11%5%2442235%7%50%
1984
October1st to 15thDay
15%10%25%323347%40%
1705
16th to endDay
9%10%35%435%5%6%7%38%
1629
November1st to 15thDay
6%11%47%5%235%5%7%38%
1408
16th to endDay
10%11%48%8%36%447%29%
1440
December1st to 15thDay
8%9%6%12%10%5%7%5%6%6%21%
1326
16th to endDay
5%11%6%11%9%5%6%5%5%428%
1344
January1st to 15thNight
5%11%48%8%47%5%5%8%29%
2685
16th to endNight
410%410%8%5%6%7%7%7%28%
2791
February1st to 15thNight
5%10%6%8%7%5%6%5%6%7%29%
2292
16th to endNight
6%12%6%9%6%5%6%6%7%7%25%
2046
March1st to 15thNight
5%8%47%8%45%5%5%9%34%
2073
16th to endNight
9%11%6%8%7%45%5%47%28%
2067
April1st to 15thNight
9%8%35%6%36%5%5%7%38%
1789
16th to endNight
13%11%47%5%36%6%35%32%
1562
May1st to 15thNight
11%6%35%425%46%7%42%
1439
16th to endNight
18%6%36%425%46%7%33%
1423
June1st to 15thNight
14%5%35%4245%7%8%38%
1260
16th to endNight
8%5%245%345%6%9%43%
1260
July1st to 15thNight
6%3243246%6%8%52%
1260
16th to endNight
321332435%10%59%
1388
August1st to 15thNight
8%31331446%9%54%
1479
16th to endNight
8%31331245%8%57%
1751
September1st to 15thNight
10%5%1442445%5%51%
1800
16th to endNight
9%323324447%53%
1974
October1st to 15thNight
11%8%35%413347%43%
2052
16th to endNight
9%9%47%435%45%8%37%
2228
November1st to 15thNight
9%11%45%5%35%45%7%37%
2450
16th to endNight
7%10%49%6%35%5%5%8%32%
2520
December1st to 15thNight
7%11%6%12%10%5%7%5%6%6%20%
2634
16th to endNight
6%10%5%9%8%37%6%6%7%27%
2880

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%9%13%15%5%
1253
16th to endDay
51%10%15%15%41
1431
February1st to 15thDay
58%7%13%15%5%
1570
16th to endDay
56%7%14%13%7%
1428
March1st to 15thDay
53%9%18%13%4
1886
16th to endDay
57%9%15%15%2
2157
April1st to 15thDay
48%8%15%20%6%
2158
16th to endDay
53%6%12%20%5%1
2397
May1st to 15thDay
48%6%12%24%8%
2511
16th to endDay
54%7%13%17%7%
2692
June1st to 15thDay
50%7%14%19%7%
2700
16th to endDay
40%9%16%25%6%
2700
July1st to 15thDay
31%8%19%28%11%
2541
16th to endDay
27%7%16%30%15%2
2606
August1st to 15thDay
33%8%18%26%10%1
2463
16th to endDay
27%5%15%31%17%3
2450
September1st to 15thDay
37%5%12%25%17%2
2160
16th to endDay
34%6%12%31%14%1
1984
October1st to 15thDay
44%418%24%7%
1705
16th to endDay
41%7%17%27%4
1629
November1st to 15thDay
43%7%17%24%6%
1408
16th to endDay
53%7%16%17%4
1440
December1st to 15thDay
60%9%14%13%2
1326
16th to endDay
55%7%17%15%3
1344
January1st to 15thNight
51%7%18%17%4
2685
16th to endNight
49%10%16%17%5%1
2791
February1st to 15thNight
51%7%16%16%6%1
2303
16th to endNight
53%8%13%17%7%
2046
March1st to 15thNight
46%7%19%18%8%
2073
16th to endNight
54%7%14%16%5%
2067
April1st to 15thNight
42%5%16%23%10%1
1789
16th to endNight
50%7%11%16%10%2
1562
May1st to 15thNight
38%7%11%27%14%1
1440
16th to endNight
48%7%13%18%10%
1424
June1st to 15thNight
40%9%14%23%11%
1260
16th to endNight
35%8%18%28%8%
1260
July1st to 15thNight
27%7%18%28%16%1
1190
16th to endNight
20%5%15%33%20%4
1299
August1st to 15thNight
25%6%21%32%11%2
1471
16th to endNight
25%413%29%23%3
1751
September1st to 15thNight
34%5%10%25%17%7%
1800
16th to endNight
29%6%11%32%17%3
1974
October1st to 15thNight
40%6%13%25%13%
2052
16th to endNight
43%7%15%24%8%
2228
November1st to 15thNight
44%7%16%20%10%1
2450
16th to endNight
48%7%18%17%6%
2520
December1st to 15thNight
61%8%13%12%3
2634
16th to endNight
52%8%16%16%5%
2880

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
8%128%31%26%3
60
16th to endDay
12%10%37%18%18%1
79
February1st to 15thDay
16%15%42%21%4
90
16th to endDay
13%9%44%22%7%2
81
March1st to 15thDay
11%19%42%19%7%
176
16th to endDay
17%14%35%25%7%1
288
April1st to 15thDay
16%19%36%21%6%
269
16th to endDay
25%10%26%26%9%
327
May1st to 15thDay
13%9%29%29%14%3
468
16th to endDay
21%10%21%23%16%5%
517
June1st to 15thDay
16%10%31%26%11%3
495
16th to endDay
13%10%27%28%17%2
495
July1st to 15thDay
9%423%33%25%3
475
16th to endDay
8%5%25%35%21%3
515
August1st to 15thDay
11%424%29%22%7%
452
16th to endDay
9%423%39%18%4
332
September1st to 15thDay
18%6%27%27%16%3
315
16th to endDay
11%9%26%29%18%4
252
October1st to 15thDay
35%229%18%9%3
107
16th to endDay
15%6%29%29%17%2
96
November1st to 15thDay
10%5%44%28%11%
90
16th to endDay
12%15%28%21%16%5%
90
December1st to 15thDay
11%243%22%7%12%
71
16th to endDay
15%12%40%15%14%1
64
January1st to 15thNight
11%15%40%23%8%1
900
16th to endNight
8%17%41%24%8%
960
February1st to 15thNight
9%10%33%33%11%1
719
16th to endNight
9%8%31%33%13%3
632
March1st to 15thNight
9%9%39%29%9%1
720
16th to endNight
13%10%34%31%8%1
723
April1st to 15thNight
11%7%37%32%9%
539
16th to endNight
17%9%28%32%10%
540
May1st to 15thNight
14%5%29%32%15%2
540
16th to endNight
20%6%22%32%14%2
489
June1st to 15thNight
17%5%27%35%12%1
360
16th to endNight
10%8%26%35%18%
360
July1st to 15thNight
8%423%44%17%1
340
16th to endNight
4426%45%18%1
441
August1st to 15thNight
9%220%39%25%2
539
16th to endNight
10%221%40%23%1
573
September1st to 15thNight
12%226%37%18%2
540
16th to endNight
9%332%37%14%1
647
October1st to 15thNight
16%6%34%28%12%1
684
16th to endNight
14%8%36%30%9%
790
November1st to 15thNight
15%11%38%24%8%1
875
16th to endNight
12%15%41%23%7%
900
December1st to 15thNight
11%11%37%27%9%1
900
16th to endNight
11%10%38%27%10%1
960
Page generated at 2017-10-07 12:07:49. Version ac04

Copyright 2017 A. Danko


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