Hinton
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hinton clear sky chart from 2005-11-05 to 2017-09-24.

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
32%
15076
10%
46729
5%
15045
37%
15045
15%
34233

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
21%
930
8%
2865
4%
925
25%
925
10%
2215
January16th to endNight
22%
796
16%
2736
8%
796
32%
796
13%
1943
February1st to 15thNight
26%
697
8%
2464
5%
696
31%
696
11%
1817
February16th to endNight
35%
632
10%
1982
9%
632
38%
632
17%
1434
March1st to 15thNight
26%
720
13%
2160
7%
720
34%
720
15%
1586
March16th to endNight
31%
768
11%
2014
4%
767
35%
767
15%
1555
April1st to 15thNight
31%
683
9%
1763
4%
683
34%
683
14%
1395
April16th to endNight
27%
450
7%
1530
7%
450
29%
450
11%
1180
May1st to 15thNight
44%
359
4%
1395
4%
359
46%
359
13%
996
May16th to endNight
41%
374
1%
1291
0%
374
42%
374
13%
971
June1st to 15thNight
40%
360
0%
1080
0%
360
40%
360
13%
854
June16th to endNight
43%
360
0%
1080
0%
360
43%
360
15%
807
July1st to 15thNight
50%
340
0%
1020
0%
340
50%
340
21%
718
July16th to endNight
57%
376
2%
1251
0%
354
59%
354
18%
854
August1st to 15thNight
57%
360
5%
1432
8%
358
58%
358
17%
955
August16th to endNight
48%
514
12%
1660
12%
514
50%
514
19%
1134
September1st to 15thNight
47%
720
12%
1800
8%
720
48%
720
26%
1282
September16th to endNight
40%
692
16%
1901
9%
692
45%
692
25%
1273
October1st to 15thNight
34%
660
12%
1994
8%
660
40%
660
17%
1424
October16th to endNight
25%
704
12%
2288
6%
704
34%
704
14%
1665
November1st to 15thNight
20%
778
14%
2487
5%
778
31%
778
14%
1738
November16th to endNight
18%
900
9%
2700
2%
900
25%
900
12%
2036
December1st to 15thNight
24%
911
11%
2764
7%
911
27%
911
12%
2142
December16th to endNight
26%
992
12%
3072
4%
992
34%
992
14%
2259

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%10%48%7%46%5%6%7%27%
48238
Night
9%11%48%6%35%5%6%7%30%
46872
TransparencyDay
54%10%15%14%5%
47883
Night
50%9%15%17%5%
46733
SeeingDay
21%14%29%23%10%1
6648
Night
15%11%31%27%12%1
15085

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
6%9%6%10%8%36%5%6%8%28%
1074
16th to endDay
5%11%6%10%7%45%46%7%30%
1497
February1st to 15thDay
5%11%5%12%6%35%5%6%7%29%
1400
16th to endDay
411%6%13%9%47%5%5%7%25%
1490
March1st to 15thDay
410%5%9%8%5%5%6%7%9%28%
1800
16th to endDay
414%7%10%7%36%7%7%9%20%
2203
April1st to 15thDay
7%17%7%10%7%36%6%6%7%19%
2185
16th to endDay
12%15%5%9%8%45%446%22%
2430
May1st to 15thDay
13%12%47%6%45%5%5%5%27%
2556
16th to endDay
22%10%47%5%35%45%6%22%
2819
June1st to 15thDay
25%9%36%6%36%5%6%6%19%
2880
16th to endDay
16%8%38%8%5%6%6%5%7%23%
2880
July1st to 15thDay
19%6%35%6%46%6%6%7%27%
2880
16th to endDay
12%6%36%6%5%7%7%7%8%28%
2826
August1st to 15thDay
15%6%25%6%45%7%7%8%30%
2520
16th to endDay
13%7%27%6%46%6%5%8%31%
2540
September1st to 15thDay
15%8%25%5%35%45%7%36%
2160
16th to endDay
14%7%25%5%34347%40%
1916
October1st to 15thDay
11%13%37%6%36%5%6%7%28%
1634
16th to endDay
8%13%45%5%345%6%7%34%
1584
November1st to 15thDay
6%9%5%8%7%26%6%6%8%32%
1358
16th to endDay
412%6%9%7%35%5%8%7%29%
1260
December1st to 15thDay
7%13%6%10%10%47%5%37%24%
1194
16th to endDay
314%49%5%45%5%5%7%33%
1152
January1st to 15thNight
7%12%6%9%8%46%6%5%7%25%
2865
16th to endNight
5%11%5%9%7%45%5%5%6%32%
2736
February1st to 15thNight
6%12%410%8%5%5%5%5%6%29%
2452
16th to endNight
312%5%8%7%47%5%7%7%30%
1982
March1st to 15thNight
410%5%10%7%46%5%6%8%30%
2160
16th to endNight
414%7%8%6%45%6%6%9%25%
2014
April1st to 15thNight
8%15%5%8%6%45%46%8%25%
1763
16th to endNight
13%15%5%8%6%35%45%6%25%
1530
May1st to 15thNight
14%9%46%5%25%6%5%7%29%
1394
16th to endNight
20%10%45%5%25%47%7%27%
1291
June1st to 15thNight
20%8%446%45%5%6%7%25%
1080
16th to endNight
15%7%27%5%47%5%7%7%28%
1080
July1st to 15thNight
17%4234346%7%7%36%
1080
16th to endNight
11%325%5%37%7%8%9%35%
1339
August1st to 15thNight
14%7%35%5%45%47%8%35%
1440
16th to endNight
11%6%25%5%45%5%8%7%37%
1660
September1st to 15thNight
15%8%26%42345%6%40%
1800
16th to endNight
13%7%25%42346%7%42%
1901
October1st to 15thNight
11%12%47%5%3346%7%33%
1994
16th to endNight
9%11%48%6%35%5%5%7%31%
2288
November1st to 15thNight
7%13%46%5%345%6%6%34%
2487
16th to endNight
6%12%6%10%7%36%46%6%29%
2700
December1st to 15thNight
5%12%5%11%8%46%5%5%6%26%
2764
16th to endNight
312%6%8%8%5%6%5%7%6%29%
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
51%9%16%14%5%1
1074
16th to endDay
51%7%13%14%9%2
1497
February1st to 15thDay
51%10%13%15%7%1
1400
16th to endDay
57%7%13%12%8%1
1490
March1st to 15thDay
49%9%16%17%5%
1800
16th to endDay
57%11%15%11%3
2203
April1st to 15thDay
62%9%13%10%3
2185
16th to endDay
62%8%12%11%4
2430
May1st to 15thDay
56%8%13%12%8%
2556
16th to endDay
62%8%12%10%4
2824
June1st to 15thDay
64%9%11%12%2
2880
16th to endDay
57%11%14%12%4
2880
July1st to 15thDay
53%11%14%15%5%
2711
16th to endDay
50%14%18%13%3
2652
August1st to 15thDay
47%14%19%13%5%
2503
16th to endDay
48%10%19%17%4
2540
September1st to 15thDay
47%8%16%18%7%1
2160
16th to endDay
44%8%16%20%7%3
1916
October1st to 15thDay
51%10%15%16%4
1634
16th to endDay
46%10%15%23%4
1584
November1st to 15thDay
48%10%15%18%6%
1358
16th to endDay
50%11%17%13%5%2
1260
December1st to 15thDay
60%8%11%14%4
1194
16th to endDay
48%8%16%17%7%1
1152
January1st to 15thNight
55%11%13%14%32
2865
16th to endNight
51%7%12%17%7%2
2736
February1st to 15thNight
53%10%14%13%6%1
2464
16th to endNight
50%8%15%16%7%1
1982
March1st to 15thNight
51%8%14%18%6%
2160
16th to endNight
52%10%14%17%5%
2018
April1st to 15thNight
55%9%14%13%5%
1763
16th to endNight
58%8%13%14%3
1530
May1st to 15thNight
51%10%14%16%8%
1395
16th to endNight
53%10%15%14%5%
1291
June1st to 15thNight
56%12%15%13%2
1080
16th to endNight
50%12%17%14%4
1080
July1st to 15thNight
43%11%21%17%6%
1020
16th to endNight
42%12%22%17%4
1251
August1st to 15thNight
46%9%24%17%2
1432
16th to endNight
41%12%18%20%7%
1660
September1st to 15thNight
44%6%16%21%8%2
1800
16th to endNight
39%9%18%23%8%1
1901
October1st to 15thNight
49%8%15%19%6%
1994
16th to endNight
50%10%15%19%3
2288
November1st to 15thNight
47%9%14%21%6%
2487
16th to endNight
53%9%14%13%6%2
2700
December1st to 15thNight
57%8%13%15%4
2764
16th to endNight
52%8%14%17%6%1
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%5%33%30%11%8%
60
16th to endDay
10%10%37%29%10%
64
February1st to 15thDay
20%15%41%16%6%
60
16th to endDay
8%14%33%30%11%
203
March1st to 15thDay
14%26%40%14%3
270
16th to endDay
17%20%36%19%4
288
April1st to 15thDay
24%23%30%18%2
269
16th to endDay
22%22%32%16%41
270
May1st to 15thDay
18%13%32%26%7%1
333
16th to endDay
29%6%22%21%15%4
534
June1st to 15thDay
26%13%23%22%12%1
675
16th to endDay
20%11%26%25%13%1
675
July1st to 15thDay
22%8%26%26%13%1
645
16th to endDay
15%11%29%25%15%2
494
August1st to 15thDay
18%7%23%32%13%3
315
16th to endDay
19%16%35%20%7%
332
September1st to 15thDay
22%15%29%23%6%1
315
16th to endDay
24%20%25%22%6%1
288
October1st to 15thDay
28%16%27%18%7%
211
16th to endDay
14%5%31%26%19%3
96
November1st to 15thDay
20%14%41%17%21
67
16th to endDay
15%8%28%25%11%11%
60
December1st to 15thDay
8%13%30%21%18%8%
60
16th to endDay
14%14%28%23%12%7%
64
January1st to 15thNight
17%14%37%21%7%1
930
16th to endNight
14%17%36%22%8%
796
February1st to 15thNight
13%14%33%23%13%1
704
16th to endNight
9%10%32%32%13%1
632
March1st to 15thNight
10%16%37%27%7%
720
16th to endNight
11%10%31%32%12%
768
April1st to 15thNight
18%10%27%30%12%
683
16th to endNight
21%11%32%24%10%
450
May1st to 15thNight
18%7%20%39%13%
360
16th to endNight
24%6%20%27%20%
375
June1st to 15thNight
26%5%19%30%18%
360
16th to endNight
19%5%22%29%20%2
360
July1st to 15thNight
20%219%34%22%
340
16th to endNight
12%319%28%33%1
376
August1st to 15thNight
17%212%30%33%3
360
16th to endNight
16%7%23%36%15%
514
September1st to 15thNight
20%419%35%19%1
720
16th to endNight
16%9%26%32%13%2
692
October1st to 15thNight
19%9%28%31%10%
660
16th to endNight
17%12%37%23%8%1
704
November1st to 15thNight
15%19%38%20%5%
778
16th to endNight
15%15%40%21%6%1
900
December1st to 15thNight
13%13%38%24%9%
911
16th to endNight
11%13%37%25%10%1
992
Page generated at 2017-09-25 07:02:20. Version ac04

Copyright 2017 A. Danko


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