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 2017-04-08.

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%
14391
8%
45494
6%
14363
42%
14363
13%
35083

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
43%
658
8%
1696
5%
658
45%
658
18%
1324
April16th to endNight
37%
399
9%
1389
8%
399
41%
399
12%
1069
May1st to 15thNight
46%
329
8%
1320
9%
329
48%
329
14%
909
May16th to endNight
47%
342
1%
1168
0%
342
47%
342
12%
900
June1st to 15thNight
45%
330
0%
990
0%
330
45%
330
15%
739
June16th to endNight
51%
330
0%
990
0%
330
51%
330
13%
776
July1st to 15thNight
57%
310
0%
1004
0%
310
57%
310
18%
705
July16th to endNight
61%
348
4%
1141
3%
326
64%
326
25%
704
August1st to 15thNight
73%
330
11%
1305
17%
328
74%
328
24%
768
August16th to endNight
57%
512
11%
1562
12%
512
57%
512
19%
1104
September1st to 15thNight
62%
660
17%
1650
10%
660
63%
660
31%
1109
September16th to endNight
44%
656
14%
1808
8%
656
48%
656
20%
1312
October1st to 15thNight
44%
660
11%
1980
8%
660
48%
660
18%
1426
October16th to endNight
32%
704
6%
2300
4%
704
36%
704
11%
1850
November1st to 15thNight
29%
700
7%
2450
6%
700
32%
700
9%
1985
November16th to endNight
28%
808
7%
2638
4%
808
32%
808
9%
2144
December1st to 15thNight
34%
930
7%
2880
6%
930
35%
930
10%
2357
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%48%7%46%6%6%7%28%
45801
Night
11%11%5%8%7%46%5%6%7%25%
45637
TransparencyDay
53%10%15%15%4
45446
Night
57%9%13%14%4
45496
SeeingDay
15%11%24%27%17%3
5962
Night
18%10%19%29%19%2
14399

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%8%5%7%7%6%6%22%
2090
16th to endDay
11%10%5%9%8%5%6%6%6%7%21%
2241
May1st to 15thDay
11%8%39%7%46%5%5%6%29%
2301
16th to endDay
10%9%48%7%48%8%7%7%22%
2589
June1st to 15thDay
12%7%37%7%46%5%5%7%30%
2640
16th to endDay
12%7%38%6%46%6%7%8%26%
2640
July1st to 15thDay
11%6%36%5%35%6%6%8%37%
2558
16th to endDay
6%424435%6%8%9%42%
2636
August1st to 15thDay
5%425%5%36%6%7%9%43%
2318
16th to endDay
10%5%26%7%36%6%6%8%34%
2284
September1st to 15thDay
9%6%25%6%345%5%7%44%
1980
16th to endDay
16%7%446%3445%8%32%
1822
October1st to 15thDay
13%9%28%6%45%5%6%6%30%
1650
16th to endDay
18%11%48%6%45%5%5%7%22%
1571
November1st to 15thDay
16%13%6%7%6%26%6%6%7%20%
1408
16th to endDay
11%16%8%10%9%5%5%45%5%16%
1306
December1st to 15thDay
14%15%5%8%7%5%6%5%8%5%16%
1080
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
8%11%5%8%7%5%7%6%7%7%25%
1696
16th to endNight
11%9%48%8%48%6%7%7%23%
1389
May1st to 15thNight
14%9%5%8%6%35%34434%
1319
16th to endNight
11%8%48%8%48%7%7%10%19%
1168
June1st to 15thNight
18%7%46%6%36%6%45%31%
990
16th to endNight
13%7%47%7%46%7%8%10%21%
990
July1st to 15thNight
13%5%25%6%36%6%7%6%35%
1071
16th to endNight
7%426%7%346%7%10%38%
1225
August1st to 15thNight
5%315%5%46%5%8%11%41%
1312
16th to endNight
10%6%27%7%46%6%8%8%31%
1562
September1st to 15thNight
7%425%5%35%45%7%46%
1650
16th to endNight
15%7%26%6%45%45%7%33%
1808
October1st to 15thNight
13%7%37%6%345%47%34%
1980
16th to endNight
17%10%49%7%5%5%5%5%7%21%
2300
November1st to 15thNight
15%12%5%8%7%45%5%6%6%21%
2450
16th to endNight
13%13%5%10%8%45%6%6%6%19%
2638
December1st to 15thNight
14%18%5%8%6%346%5%6%20%
2880
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
59%9%12%13%4
2090
16th to endDay
59%9%11%14%4
2241
May1st to 15thDay
53%9%12%19%6%
2301
16th to endDay
55%12%14%14%3
2593
June1st to 15thDay
51%10%14%16%6%
2640
16th to endDay
52%11%16%16%3
2640
July1st to 15thDay
43%10%15%21%7%
2396
16th to endDay
31%12%25%24%5%
2457
August1st to 15thDay
35%11%22%26%3
2300
16th to endDay
44%10%20%19%5%
2284
September1st to 15thDay
38%8%22%22%7%
1980
16th to endDay
50%10%17%16%4
1822
October1st to 15thDay
51%8%20%15%3
1650
16th to endDay
60%10%16%11%1
1571
November1st to 15thDay
62%10%12%9%5%
1408
16th to endDay
68%10%7%11%2
1306
December1st to 15thDay
65%11%11%8%3
1080
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%12%17%6%
1696
16th to endNight
57%9%12%15%4
1389
May1st to 15thNight
52%6%10%18%11%
1320
16th to endNight
55%11%15%14%2
1168
June1st to 15thNight
52%9%12%17%7%
990
16th to endNight
53%13%14%13%3
990
July1st to 15thNight
45%11%14%14%12%1
1004
16th to endNight
35%11%22%27%4
1141
August1st to 15thNight
34%10%21%28%4
1305
16th to endNight
46%10%17%18%5%1
1562
September1st to 15thNight
35%9%15%28%9%1
1650
16th to endNight
48%8%14%20%6%
1808
October1st to 15thNight
48%9%17%19%5%
1980
16th to endNight
62%8%14%13%
2300
November1st to 15thNight
62%9%11%10%4
2450
16th to endNight
63%9%10%12%3
2638
December1st to 15thNight
63%9%12%12%2
2880
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%20%32%18%10%2
239
16th to endDay
16%21%25%26%8%1
210
May1st to 15thDay
10%12%35%19%16%5%
228
16th to endDay
12%9%27%28%18%3
464
June1st to 15thDay
15%9%23%25%20%4
585
16th to endDay
15%8%17%31%22%3
585
July1st to 15thDay
12%6%21%32%23%3
480
16th to endDay
7%6%23%34%24%3
445
August1st to 15thDay
7%418%36%27%5%
263
16th to endDay
10%10%25%34%17%1
268
September1st to 15thDay
14%10%20%32%18%3
255
16th to endDay
23%7%26%25%13%3
255
October1st to 15thDay
19%13%24%23%17%1
255
16th to endDay
27%8%25%20%16%1
137
November1st to 15thDay
31%26%18%15%6%1
60
16th to endDay
16%11%23%21%11%15%
60
December1st to 15thDay
21%10%11%26%21%8%
60
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%20%30%21%4
658
16th to endNight
17%11%25%27%16%2
399
May1st to 15thNight
16%6%18%33%22%2
330
16th to endNight
15%421%27%26%4
343
June1st to 15thNight
20%7%16%28%23%3
330
16th to endNight
12%6%13%36%27%3
330
July1st to 15thNight
13%314%30%33%3
310
16th to endNight
8%316%32%34%4
348
August1st to 15thNight
418%33%44%6%
330
16th to endNight
15%311%31%33%4
512
September1st to 15thNight
10%214%34%31%5%
660
16th to endNight
19%7%21%26%21%3
656
October1st to 15thNight
19%8%17%32%18%3
660
16th to endNight
23%14%19%24%16%2
704
November1st to 15thNight
24%17%20%27%8%1
700
16th to endNight
24%11%24%26%11%2
808
December1st to 15thNight
25%11%18%28%15%1
930
16th to endNight
20%14%22%27%12%1
992
Page generated at 2017-04-09 03:54:14. Version ac04

Copyright 2017 A. Danko


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