Pukatawagan
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pukatawagan clear sky chart from 2005-11-05 to 2017-11-30.

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
34%
16050
9%
47643
5%
16017
38%
16017
17%
35370

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%
897
10%
2864
8%
895
33%
895
12%
2222
January16th to endNight
25%
960
8%
2889
4%
960
30%
960
11%
2324
February1st to 15thNight
37%
875
12%
2464
6%
875
41%
875
20%
1782
February16th to endNight
35%
717
10%
2044
7%
717
38%
717
16%
1559
March1st to 15thNight
38%
720
14%
2160
10%
720
42%
720
19%
1543
March16th to endNight
38%
588
18%
2025
14%
588
47%
588
20%
1333
April1st to 15thNight
45%
539
15%
1717
12%
539
49%
539
22%
1141
April16th to endNight
41%
540
15%
1521
7%
540
44%
540
29%
990
May1st to 15thNight
40%
540
4%
1302
3%
540
41%
540
27%
926
May16th to endNight
39%
474
0%
1224
0%
474
39%
474
27%
846
June1st to 15thNight
44%
360
0%
1080
0%
360
44%
360
24%
722
June16th to endNight
45%
360
0%
1080
0%
360
45%
360
22%
748
July1st to 15thNight
51%
340
0%
1020
0%
340
51%
340
27%
656
July16th to endNight
54%
449
0%
1129
0%
421
55%
421
30%
750
August1st to 15thNight
57%
539
5%
1399
4%
536
59%
536
35%
882
August16th to endNight
41%
573
9%
1633
5%
573
43%
573
21%
1161
September1st to 15thNight
47%
540
11%
1763
9%
540
52%
540
27%
1085
September16th to endNight
34%
537
13%
1980
10%
537
42%
537
16%
1341
October1st to 15thNight
29%
757
10%
2197
5%
757
33%
757
15%
1672
October16th to endNight
20%
960
7%
2496
3%
960
23%
960
10%
2113
November1st to 15thNight
24%
950
8%
2815
4%
950
27%
950
9%
2326
November16th to endNight
22%
975
5%
2924
3%
975
25%
975
8%
2452
December1st to 15thNight
28%
900
6%
2845
4%
900
31%
900
9%
2355
December16th to endNight
29%
960
9%
3072
7%
960
33%
960
12%
2441

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
14%10%47%6%35%5%5%7%29%
48816
Night
13%11%5%8%7%45%5%5%6%26%
47770
Cloud CoverDay
14%10%47%7%35%5%5%7%28%
48824
Night
12%11%5%8%7%45%5%5%6%26%
47774
TransparencyDay
53%414%19%6%
48459
Night
56%413%18%5%
47643
SeeingDay
19%8%26%27%13%4
6540
Night
18%6%26%30%15%2
16060

By Month

Percentage Cloud Cover NE (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%14%6%9%8%5%8%7%7%7%17%
1074
16th to endDay
14%12%6%12%9%46%6%6%416%
1333
February1st to 15thDay
5%10%47%9%6%9%7%9%7%23%
1400
16th to endDay
6%9%5%9%10%6%8%8%7%7%22%
1440
March1st to 15thDay
11%13%6%8%6%33445%30%
1790
16th to endDay
11%9%5%7%5%34447%37%
2197
April1st to 15thDay
9%9%39%7%3445%6%35%
2231
16th to endDay
8%8%37%6%35%5%6%8%35%
2439
May1st to 15thDay
15%9%37%6%24448%33%
2649
16th to endDay
17%7%25%424346%40%
2888
June1st to 15thDay
16%7%35%6%35%447%34%
2880
16th to endDay
18%7%36%6%36%5%5%6%29%
2880
July1st to 15thDay
17%5%25%6%35%5%6%8%32%
2880
16th to endDay
14%5%25%6%35%6%6%8%34%
2960
August1st to 15thDay
12%5%26%6%25%5%6%7%37%
2553
16th to endDay
18%7%36%5%345%6%8%30%
2569
September1st to 15thDay
18%7%36%5%24446%34%
2196
16th to endDay
19%12%46%5%345%5%7%26%
1980
October1st to 15thDay
21%18%47%5%2444422%
1750
16th to endDay
21%21%6%10%6%4433413%
1728
November1st to 15thDay
17%16%5%12%8%4423418%
1372
16th to endDay
10%15%6%14%9%5%7%5%5%6%12%
1362
December1st to 15thDay
10%12%6%11%13%6%6%5%7%7%12%
1113
16th to endDay
7%15%7%13%11%47%7%47%12%
1152
January1st to 15thNight
9%12%5%10%7%5%8%7%7%6%18%
2864
16th to endNight
11%14%6%10%8%5%7%6%6%6%15%
2889
February1st to 15thNight
7%7%5%7%7%5%9%7%6%8%27%
2460
16th to endNight
6%11%6%10%8%5%6%6%6%7%23%
2044
March1st to 15thNight
12%11%5%8%6%345%45%32%
2147
16th to endNight
11%10%46%6%4445%7%34%
2025
April1st to 15thNight
11%7%27%5%36%47%5%37%
1717
16th to endNight
7%9%37%5%25%447%41%
1521
May1st to 15thNight
17%8%345%3335%6%37%
1302
16th to endNight
17%6%246%2445%7%38%
1223
June1st to 15thNight
16%5%26%6%34436%39%
1080
16th to endNight
16%8%25%5%35%5%47%33%
1080
July1st to 15thNight
16%4244445%7%8%36%
1080
16th to endNight
11%325%5%35%6%7%8%38%
1207
August1st to 15thNight
10%4144345%6%10%43%
1406
16th to endNight
15%8%26%6%45%5%6%6%33%
1633
September1st to 15thNight
15%42342445%8%43%
1763
16th to endNight
21%8%45%5%2335%7%31%
1980
October1st to 15thNight
22%14%45%5%33445%27%
2197
16th to endNight
21%20%6%9%7%3234417%
2496
November1st to 15thNight
16%15%6%12%9%34445%17%
2815
16th to endNight
9%14%8%12%11%6%7%5%5%6%13%
2924
December1st to 15thNight
9%13%7%13%10%5%8%7%5%5%14%
2845
16th to endNight
8%15%7%12%9%45%6%7%6%15%
3072

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%14%6%8%8%5%8%6%7%7%17%
1074
16th to endDay
15%12%6%12%9%5%6%6%5%416%
1333
February1st to 15thDay
5%10%47%9%6%9%7%8%7%23%
1400
16th to endDay
6%9%49%10%6%8%8%6%7%22%
1440
March1st to 15thDay
12%13%6%8%7%3345%5%30%
1800
16th to endDay
11%9%5%7%5%3445%7%37%
2195
April1st to 15thDay
9%10%39%6%35%45%5%35%
2231
16th to endDay
8%8%37%6%35%5%6%8%35%
2439
May1st to 15thDay
15%8%46%6%2445%7%32%
2649
16th to endDay
17%8%25%424346%39%
2888
June1st to 15thDay
16%7%36%6%345%5%7%34%
2880
16th to endDay
18%7%37%6%46%5%5%7%29%
2880
July1st to 15thDay
16%6%25%6%35%5%7%7%32%
2880
16th to endDay
13%6%26%6%45%6%6%8%34%
2960
August1st to 15thDay
11%6%36%6%25%5%6%8%36%
2553
16th to endDay
17%7%36%5%445%6%8%29%
2569
September1st to 15thDay
17%8%27%6%24446%34%
2196
16th to endDay
18%12%46%5%3445%7%26%
1980
October1st to 15thDay
21%18%47%5%3444421%
1750
16th to endDay
21%21%7%9%7%3433413%
1728
November1st to 15thDay
17%16%6%11%9%45%23418%
1372
16th to endDay
10%14%7%14%9%5%6%5%6%6%12%
1362
December1st to 15thDay
10%12%6%11%13%7%5%5%7%7%12%
1113
16th to endDay
7%15%7%14%10%48%7%47%12%
1152
January1st to 15thNight
9%12%6%10%7%5%8%7%7%6%18%
2864
16th to endNight
11%14%6%10%8%5%7%6%7%6%15%
2889
February1st to 15thNight
7%7%5%7%7%5%9%7%6%8%26%
2453
16th to endNight
6%12%6%10%7%46%7%6%6%23%
2044
March1st to 15thNight
12%11%5%8%6%345%45%32%
2160
16th to endNight
11%10%45%5%45%46%6%34%
2023
April1st to 15thNight
11%7%27%6%45%5%6%6%36%
1717
16th to endNight
7%9%47%425%45%7%41%
1521
May1st to 15thNight
16%8%35%5%33446%37%
1301
16th to endNight
17%6%246%2445%7%38%
1224
June1st to 15thNight
16%5%25%6%35%445%39%
1080
16th to endNight
16%8%35%5%35%5%5%7%33%
1080
July1st to 15thNight
16%425%435%5%7%8%36%
1080
16th to endNight
11%325%6%346%7%9%38%
1207
August1st to 15thNight
9%425%5%3447%9%43%
1406
16th to endNight
14%8%26%7%45%46%6%33%
1633
September1st to 15thNight
14%42433446%7%43%
1763
16th to endNight
20%8%46%5%3345%7%31%
1980
October1st to 15thNight
21%14%46%433445%26%
2197
16th to endNight
21%19%6%9%6%3234417%
2496
November1st to 15thNight
16%15%6%11%8%44445%18%
2815
16th to endNight
9%14%7%12%11%5%7%5%5%6%13%
2924
December1st to 15thNight
9%13%7%13%10%5%8%7%6%5%14%
2845
16th to endNight
7%15%8%12%9%45%6%7%6%15%
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
62%5%11%16%3
1074
16th to endDay
68%36%15%5%
1333
February1st to 15thDay
53%414%20%7%
1400
16th to endDay
58%310%20%6%
1440
March1st to 15thDay
55%412%17%8%
1800
16th to endDay
46%313%25%9%1
2197
April1st to 15thDay
49%412%22%10%
2231
16th to endDay
44%412%27%11%
2439
May1st to 15thDay
50%311%22%10%2
2649
16th to endDay
45%39%25%15%
2892
June1st to 15thDay
49%310%24%11%
2880
16th to endDay
53%414%20%6%
2880
July1st to 15thDay
46%6%18%22%6%
2711
16th to endDay
45%5%21%23%3
2775
August1st to 15thDay
44%6%22%25%2
2536
16th to endDay
49%7%25%16%1
2569
September1st to 15thDay
49%421%18%5%
2196
16th to endDay
56%421%15%2
1980
October1st to 15thDay
64%414%15%1
1750
16th to endDay
75%310%8%1
1728
November1st to 15thDay
71%211%11%3
1372
16th to endDay
70%6%12%9%
1362
December1st to 15thDay
68%412%12%2
1113
16th to endDay
70%39%14%1
1152
January1st to 15thNight
61%5%12%16%3
2864
16th to endNight
66%410%14%4
2889
February1st to 15thNight
52%414%20%8%
2464
16th to endNight
57%5%12%17%7%
2044
March1st to 15thNight
54%313%20%7%
2160
16th to endNight
48%310%25%9%2
2025
April1st to 15thNight
46%411%22%12%1
1717
16th to endNight
41%410%29%14%
1521
May1st to 15thNight
48%29%25%10%3
1302
16th to endNight
45%38%24%16%
1224
June1st to 15thNight
46%38%27%14%
1080
16th to endNight
48%5%17%20%7%
1080
July1st to 15thNight
40%5%19%24%9%
1020
16th to endNight
38%7%20%27%6%
1129
August1st to 15thNight
33%6%28%26%5%
1399
16th to endNight
49%6%20%20%3
1633
September1st to 15thNight
37%6%24%25%5%
1763
16th to endNight
51%315%23%4
1980
October1st to 15thNight
59%414%17%4
2197
16th to endNight
71%311%11%1
2496
November1st to 15thNight
70%311%11%3
2815
16th to endNight
71%413%10%
2924
December1st to 15thNight
69%5%11%11%2
2845
16th to endNight
65%411%15%2
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
35%38%35%18%
60
16th to endDay
34%8%23%21%9%2
82
February1st to 15thDay
3451%30%6%4
90
16th to endDay
11%7%32%22%20%6%
81
March1st to 15thDay
34%320%26%12%3
90
16th to endDay
17%7%27%25%19%3
193
April1st to 15thDay
17%8%35%30%6%
350
16th to endDay
10%7%31%32%14%4
450
May1st to 15thDay
21%11%26%26%11%3
468
16th to endDay
19%9%22%28%16%3
517
June1st to 15thDay
20%7%25%28%12%5%
495
16th to endDay
21%6%25%26%13%5%
495
July1st to 15thDay
19%9%22%28%14%5%
475
16th to endDay
17%7%21%28%16%8%
515
August1st to 15thDay
14%7%19%27%21%9%
493
16th to endDay
20%8%26%29%14%1
523
September1st to 15thDay
25%11%30%21%9%
351
16th to endDay
26%9%20%25%14%2
135
October1st to 15thDay
36%11%26%22%2
135
16th to endDay
43%8%23%18%42
144
November1st to 15thDay
14%8%31%29%13%2
135
16th to endDay
26%233%27%5%2
134
December1st to 15thDay
23%121%33%15%4
65
16th to endDay
6%432%39%14%3
64
January1st to 15thNight
13%6%32%29%15%2
900
16th to endNight
17%8%33%28%10%
960
February1st to 15thNight
11%6%32%31%14%3
880
16th to endNight
12%6%28%31%18%3
717
March1st to 15thNight
18%8%22%30%17%2
720
16th to endNight
15%7%27%25%19%2
588
April1st to 15thNight
16%324%36%16%1
539
16th to endNight
11%5%31%33%16%2
540
May1st to 15thNight
22%6%24%32%11%2
540
16th to endNight
19%7%26%29%14%1
476
June1st to 15thNight
20%421%35%16%2
360
16th to endNight
21%319%36%17%1
360
July1st to 15thNight
19%317%32%23%2
340
16th to endNight
12%317%36%23%6%
449
August1st to 15thNight
12%319%32%24%7%
539
16th to endNight
19%427%32%15%1
573
September1st to 15thNight
17%5%24%34%17%1
540
16th to endNight
25%7%24%27%13%
537
October1st to 15thNight
31%6%22%27%8%2
757
16th to endNight
35%9%23%21%8%1
960
November1st to 15thNight
24%8%25%26%13%1
950
16th to endNight
15%9%31%28%12%2
975
December1st to 15thNight
13%6%29%32%13%3
900
16th to endNight
15%5%25%29%18%5%
960
Page generated at 2017-12-01 11:13:47. Version ac04

Copyright 2017 A. Danko


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