Quesnel
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Quesnel clear sky chart from 2005-11-05 to 2017-12-02.

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%
15095
8%
47720
6%
15067
42%
15067
13%
36590

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
26%
777
5%
2713
4%
773
29%
773
6%
2321
January16th to endNight
29%
798
7%
2868
6%
798
30%
798
8%
2334
February1st to 15thNight
35%
698
6%
2366
5%
698
37%
698
10%
1898
February16th to endNight
45%
632
10%
2053
10%
632
48%
632
15%
1484
March1st to 15thNight
30%
720
10%
2101
8%
720
33%
720
13%
1646
March16th to endNight
42%
768
9%
2050
6%
768
43%
768
15%
1602
April1st to 15thNight
44%
683
8%
1763
4%
683
45%
683
18%
1376
April16th to endNight
38%
435
9%
1515
9%
435
42%
435
12%
1156
May1st to 15thNight
46%
359
8%
1440
8%
359
48%
359
14%
1006
May16th to endNight
49%
374
2%
1277
0%
374
49%
374
13%
965
June1st to 15thNight
46%
360
0%
1080
0%
360
46%
360
16%
798
June16th to endNight
53%
360
0%
1080
0%
360
53%
360
14%
828
July1st to 15thNight
57%
340
0%
1102
0%
340
57%
340
18%
766
July16th to endNight
63%
376
5%
1239
4%
354
66%
354
26%
750
August1st to 15thNight
75%
360
11%
1424
17%
358
75%
358
26%
807
August16th to endNight
59%
559
11%
1705
13%
559
59%
559
20%
1186
September1st to 15thNight
62%
720
16%
1800
10%
720
63%
720
31%
1208
September16th to endNight
45%
716
15%
1973
9%
716
48%
716
21%
1426
October1st to 15thNight
44%
720
10%
2160
8%
720
47%
720
18%
1557
October16th to endNight
33%
768
7%
2509
5%
768
38%
768
11%
1983
November1st to 15thNight
30%
760
7%
2660
6%
760
33%
760
9%
2146
November16th to endNight
27%
878
7%
2858
4%
878
30%
878
8%
2346
December1st to 15thNight
34%
942
7%
2912
6%
942
35%
942
10%
2384
December16th to endNight
26%
992
6%
3072
3%
992
28%
992
7%
2617

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%9%47%7%46%6%6%7%28%
48767
Night
11%11%48%7%46%5%6%7%26%
47863
TransparencyDay
52%10%15%16%4
48412
Night
56%9%13%15%5%
47722
SeeingDay
14%11%24%27%17%3
6941
Night
18%10%19%29%19%3
15103

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
12%17%8%10%10%5%7%5%45%12%
1235
16th to endDay
11%15%8%12%8%36%46%5%17%
1356
February1st to 15thDay
14%13%5%9%8%45%45%6%22%
1496
16th to endDay
6%13%5%11%8%35%446%30%
1421
March1st to 15thDay
9%15%5%8%7%36%5%5%7%24%
1855
16th to endDay
7%10%49%8%47%7%7%7%24%
2172
April1st to 15thDay
8%13%5%8%9%5%7%6%6%6%21%
2184
16th to endDay
11%10%5%9%8%5%6%6%6%7%21%
2445
May1st to 15thDay
11%8%39%7%47%5%5%6%28%
2511
16th to endDay
10%8%47%7%48%8%7%7%25%
2832
June1st to 15thDay
12%6%37%7%46%5%5%7%31%
2880
16th to endDay
11%7%38%6%46%6%7%7%27%
2880
July1st to 15thDay
10%6%35%5%345%6%8%38%
2790
16th to endDay
6%424435%6%8%9%43%
2846
August1st to 15thDay
5%4245%36%6%6%8%45%
2529
16th to endDay
10%5%26%6%36%7%6%9%34%
2493
September1st to 15thDay
10%5%25%6%3445%7%44%
2160
16th to endDay
15%8%35%6%3445%8%32%
1987
October1st to 15thDay
14%9%27%6%45%5%5%6%30%
1800
16th to endDay
17%11%48%6%46%45%7%22%
1714
November1st to 15thDay
15%12%6%8%6%36%6%6%6%21%
1528
16th to endDay
11%17%7%9%10%5%5%5%5%5%16%
1415
December1st to 15thDay
14%15%5%8%7%5%6%5%8%6%16%
1086
16th to endDay
9%16%6%11%8%5%6%5%5%7%16%
1152
January1st to 15thNight
12%16%7%12%8%47%5%5%5%14%
2713
16th to endNight
13%15%6%10%8%45%5%5%5%18%
2868
February1st to 15thNight
14%14%6%9%7%45%5%45%21%
2354
16th to endNight
8%12%5%8%5%45%46%7%31%
2053
March1st to 15thNight
9%15%5%8%7%5%5%45%7%24%
2101
16th to endNight
6%12%5%8%8%47%7%6%8%24%
2048
April1st to 15thNight
9%11%5%8%6%5%7%6%7%7%25%
1763
16th to endNight
11%9%48%8%47%6%7%7%24%
1515
May1st to 15thNight
14%9%5%8%6%35%345%33%
1439
16th to endNight
11%8%38%8%47%7%7%10%21%
1277
June1st to 15thNight
17%7%46%6%36%6%46%31%
1080
16th to endNight
12%6%46%7%46%7%8%10%24%
1080
July1st to 15thNight
12%5%25%6%36%7%7%6%35%
1169
16th to endNight
7%426%7%335%7%10%40%
1323
August1st to 15thNight
5%315%5%46%5%8%10%45%
1431
16th to endNight
9%6%27%7%36%6%8%9%32%
1705
September1st to 15thNight
7%425%5%35%45%6%47%
1800
16th to endNight
14%8%26%6%45%45%7%34%
1973
October1st to 15thNight
13%8%37%6%345%47%34%
2160
16th to endNight
16%10%49%7%5%5%5%5%7%22%
2509
November1st to 15thNight
14%12%5%8%7%45%6%6%6%21%
2660
16th to endNight
13%13%5%10%8%46%6%6%6%18%
2858
December1st to 15thNight
13%18%5%8%6%35%6%6%6%20%
2912
16th to endNight
9%17%6%11%9%5%6%5%45%17%
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
72%8%10%6%1
1235
16th to endDay
67%8%10%7%5%1
1356
February1st to 15thDay
63%7%13%10%5%
1496
16th to endDay
54%7%16%14%6%
1421
March1st to 15thDay
58%9%11%14%5%
1855
16th to endDay
55%10%17%13%2
2172
April1st to 15thDay
60%9%12%13%3
2184
16th to endDay
59%9%11%14%4
2445
May1st to 15thDay
54%9%11%18%6%
2511
16th to endDay
53%11%14%16%3
2836
June1st to 15thDay
50%10%14%17%7%
2880
16th to endDay
50%11%16%17%4
2880
July1st to 15thDay
41%10%16%22%8%
2628
16th to endDay
31%12%25%25%5%
2667
August1st to 15thDay
33%11%20%28%5%
2511
16th to endDay
43%10%20%19%5%
2493
September1st to 15thDay
40%8%20%22%7%
2160
16th to endDay
51%9%16%16%4
1987
October1st to 15thDay
52%8%20%15%3
1800
16th to endDay
59%10%16%11%1
1714
November1st to 15thDay
62%9%11%10%5%
1528
16th to endDay
68%10%7%11%1
1415
December1st to 15thDay
65%11%11%8%3
1086
16th to endDay
65%10%12%9%2
1152
January1st to 15thNight
71%7%10%7%1
2713
16th to endNight
66%8%11%8%41
2868
February1st to 15thNight
64%7%12%10%5%
2366
16th to endNight
51%8%17%16%6%
2053
March1st to 15thNight
58%8%11%15%5%
2101
16th to endNight
55%9%15%14%4
2052
April1st to 15thNight
54%8%11%17%6%
1763
16th to endNight
56%9%12%16%4
1515
May1st to 15thNight
52%7%10%18%10%
1440
16th to endNight
53%11%15%16%2
1277
June1st to 15thNight
51%9%12%18%7%
1080
16th to endNight
51%13%14%14%5%
1080
July1st to 15thNight
44%11%14%15%11%1
1102
16th to endNight
33%10%21%28%5%
1239
August1st to 15thNight
32%9%20%28%9%
1424
16th to endNight
44%10%19%18%6%1
1705
September1st to 15thNight
36%9%14%28%9%1
1800
16th to endNight
48%8%14%21%6%
1973
October1st to 15thNight
48%9%17%19%5%
2160
16th to endNight
60%8%15%13%1
2509
November1st to 15thNight
62%9%11%10%5%
2660
16th to endNight
64%9%9%12%3
2858
December1st to 15thNight
63%9%12%12%2
2912
16th to endNight
68%9%9%8%3
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
15%313%35%21%11%
60
16th to endDay
21%23%21%21%6%4
64
February1st to 15thDay
19%14%28%21%14%
156
16th to endDay
11%12%37%23%10%2
211
March1st to 15thDay
21%23%31%19%3
270
16th to endDay
18%21%29%20%7%1
288
April1st to 15thDay
16%18%31%20%10%1
269
16th to endDay
17%19%26%26%8%1
270
May1st to 15thDay
11%15%33%22%13%4
288
16th to endDay
11%8%24%29%21%3
547
June1st to 15thDay
15%9%22%28%20%3
675
16th to endDay
14%8%20%32%21%3
675
July1st to 15thDay
11%5%21%33%24%3
562
16th to endDay
7%6%21%34%25%3
515
August1st to 15thDay
6%417%35%28%8%
324
16th to endDay
10%9%25%34%18%2
332
September1st to 15thDay
15%10%21%28%19%4
315
16th to endDay
22%6%25%25%16%3
315
October1st to 15thDay
20%12%24%21%17%3
315
16th to endDay
27%13%22%21%14%1
184
November1st to 15thDay
23%23%25%17%5%4
90
16th to endDay
18%15%23%20%10%12%
90
December1st to 15thDay
20%9%12%27%20%8%
62
16th to endDay
15%6%18%31%23%4
64
January1st to 15thNight
24%12%20%26%12%2
777
16th to endNight
23%12%22%25%14%1
798
February1st to 15thNight
22%12%17%30%15%2
704
16th to endNight
14%10%18%34%20%2
632
March1st to 15thNight
17%18%27%23%10%2
720
16th to endNight
13%12%21%30%21%1
768
April1st to 15thNight
15%7%19%30%21%4
683
16th to endNight
17%10%24%28%16%2
435
May1st to 15thNight
16%6%18%33%21%2
360
16th to endNight
14%420%27%29%4
375
June1st to 15thNight
20%6%15%29%24%3
360
16th to endNight
11%5%13%38%27%3
360
July1st to 15thNight
13%315%31%32%3
340
16th to endNight
7%315%32%35%4
376
August1st to 15thNight
418%32%45%7%
360
16th to endNight
14%311%32%33%4
559
September1st to 15thNight
10%214%35%31%5%
720
16th to endNight
19%7%20%26%21%4
716
October1st to 15thNight
20%8%17%31%18%4
720
16th to endNight
23%13%19%24%16%2
768
November1st to 15thNight
23%18%19%27%9%1
760
16th to endNight
25%12%24%25%10%2
878
December1st to 15thNight
24%11%19%28%15%1
942
16th to endNight
20%14%22%27%12%1
992
Page generated at 2017-12-03 08:16:46. Version ac04

Copyright 2017 A. Danko


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