Timmins
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Timmins clear sky chart from 2005-11-05 to 2017-09-15.

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
26%
15198
9%
46751
6%
15164
30%
15164
13%
36154

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
15%
898
6%
2685
3%
895
18%
895
6%
2336
January16th to endNight
24%
951
7%
2724
4%
951
27%
951
9%
2299
February1st to 15thNight
26%
704
8%
2287
6%
701
30%
701
11%
1788
February16th to endNight
22%
631
7%
2012
4%
631
26%
631
9%
1634
March1st to 15thNight
21%
719
12%
2046
7%
719
25%
719
13%
1611
March16th to endNight
30%
768
17%
2112
10%
768
36%
768
20%
1536
April1st to 15thNight
25%
617
13%
1740
7%
617
30%
617
16%
1321
April16th to endNight
29%
540
15%
1620
9%
540
35%
540
20%
1140
May1st to 15thNight
34%
438
13%
1518
12%
438
42%
438
18%
1060
May16th to endNight
33%
375
10%
1357
8%
374
39%
374
17%
915
June1st to 15thNight
35%
360
6%
1260
5%
360
37%
360
16%
871
June16th to endNight
39%
360
6%
1260
5%
360
40%
360
22%
822
July1st to 15thNight
38%
340
7%
1190
6%
340
41%
340
22%
757
July16th to endNight
45%
406
12%
1268
12%
382
46%
382
23%
816
August1st to 15thNight
46%
539
10%
1607
7%
536
50%
536
22%
1133
August16th to endNight
41%
573
15%
1719
10%
573
45%
573
25%
1117
September1st to 15thNight
34%
684
10%
1818
5%
684
37%
684
22%
1311
September16th to endNight
34%
657
14%
1815
8%
657
38%
657
22%
1258
October1st to 15thNight
24%
660
12%
1972
7%
660
30%
660
15%
1483
October16th to endNight
18%
704
7%
2214
6%
704
21%
704
7%
1892
November1st to 15thNight
17%
700
8%
2433
6%
700
21%
700
7%
2005
November16th to endNight
13%
720
6%
2520
4%
720
17%
720
6%
2144
December1st to 15thNight
12%
894
3%
2694
0%
894
15%
894
5%
2356
December16th to endNight
14%
960
4%
2880
2%
960
16%
960
5%
2549

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
20%11%47%6%35%446%25%
47996
Night
18%13%5%8%6%34445%24%
46902
TransparencyDay
59%411%16%6%
47664
Night
61%410%15%6%
46752
SeeingDay
25%11%29%20%9%3
5971
Night
25%10%29%23%9%1
15201

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
16%17%7%11%7%445%7%412%
1253
16th to endDay
14%16%7%10%6%5%6%5%6%6%13%
1497
February1st to 15thDay
6%14%8%10%10%5%9%5%47%17%
1575
16th to endDay
12%16%6%10%6%47%45%5%19%
1458
March1st to 15thDay
15%10%5%10%7%46%445%24%
1902
16th to endDay
13%14%47%8%43435%30%
2112
April1st to 15thDay
23%13%5%6%5%3424426%
2217
16th to endDay
19%11%37%425%446%31%
2340
May1st to 15thDay
20%10%37%6%35%45%5%25%
2433
16th to endDay
23%9%345%3445%5%29%
2755
June1st to 15thDay
21%8%25%5%3445%7%31%
2700
16th to endDay
21%7%25%5%35%45%8%29%
2700
July1st to 15thDay
21%6%26%5%35%5%6%8%29%
2700
16th to endDay
17%6%36%6%45%5%6%7%29%
2811
August1st to 15thDay
20%7%37%6%45%5%5%7%25%
2343
16th to endDay
20%8%25%5%35%5%48%29%
2483
September1st to 15thDay
22%8%25%5%3335%6%31%
2116
16th to endDay
25%9%26%412346%33%
1815
October1st to 15thDay
27%13%36%43333427%
1658
16th to endDay
29%23%5%8%5%2222411%
1658
November1st to 15thDay
21%18%9%8%5%2343417%
1423
16th to endDay
23%21%6%12%8%3432310%
1440
December1st to 15thDay
18%17%8%14%8%33435%11%
1263
16th to endDay
17%19%8%12%9%35%44311%
1344
January1st to 15thNight
17%18%8%11%9%36%5%4310%
2685
16th to endNight
11%17%7%10%9%5%7%6%6%5%11%
2724
February1st to 15thNight
8%12%7%10%11%6%7%45%7%17%
2285
16th to endNight
13%18%6%10%7%45%45%5%16%
2012
March1st to 15thNight
15%14%5%10%8%3444325%
2034
16th to endNight
14%12%47%6%34435%33%
2112
April1st to 15thNight
21%12%47%5%34246%26%
1740
16th to endNight
19%9%47%423336%34%
1620
May1st to 15thNight
17%9%46%5%34446%31%
1518
16th to endNight
19%7%35%5%34248%34%
1356
June1st to 15thNight
21%7%36%425%5%5%8%30%
1260
16th to endNight
17%7%35%424448%36%
1260
July1st to 15thNight
16%5%26%42445%8%37%
1260
16th to endNight
16%4245%3446%9%39%
1354
August1st to 15thNight
14%6%37%5%25%5%6%7%34%
1617
16th to endNight
17%5%246%335%5%7%40%
1719
September1st to 15thNight
20%8%35%5%23345%36%
1818
16th to endNight
22%7%34313346%39%
1815
October1st to 15thNight
22%12%26%5%2445%5%28%
1972
16th to endNight
27%18%5%7%7%23335%14%
2214
November1st to 15thNight
21%18%7%9%5%3433418%
2433
16th to endNight
22%18%8%10%7%3323315%
2520
December1st to 15thNight
17%19%7%12%9%4443411%
2694
16th to endNight
19%19%7%11%9%46%4339%
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
70%49%12%1
1254
16th to endDay
68%46%13%7%
1497
February1st to 15thDay
65%410%12%6%
1577
16th to endDay
66%37%15%7%
1458
March1st to 15thDay
61%410%14%9%
1913
16th to endDay
56%36%20%9%2
2112
April1st to 15thDay
62%35%16%10%1
2217
16th to endDay
53%49%18%12%1
2340
May1st to 15thDay
58%48%16%10%1
2433
16th to endDay
55%5%11%19%7%
2759
June1st to 15thDay
52%412%19%11%
2700
16th to endDay
53%5%12%19%8%
2700
July1st to 15thDay
49%6%15%20%7%
2541
16th to endDay
53%6%13%22%3
2634
August1st to 15thDay
56%6%14%18%3
2329
16th to endDay
52%6%15%20%4
2483
September1st to 15thDay
53%5%16%17%6%
2116
16th to endDay
52%5%14%22%5%
1815
October1st to 15thDay
61%312%16%5%
1658
16th to endDay
78%38%6%2
1658
November1st to 15thDay
69%410%10%4
1423
16th to endDay
80%27%7%1
1440
December1st to 15thDay
76%37%7%3
1263
16th to endDay
78%37%6%3
1344
January1st to 15thNight
76%47%10%1
2685
16th to endNight
71%48%12%3
2724
February1st to 15thNight
64%313%12%5%
2287
16th to endNight
69%38%12%5%
2012
March1st to 15thNight
64%38%14%8%1
2046
16th to endNight
53%38%20%12%2
2112
April1st to 15thNight
59%36%15%12%2
1740
16th to endNight
51%38%19%15%1
1620
May1st to 15thNight
52%48%19%13%1
1518
16th to endNight
48%6%13%19%9%1
1358
June1st to 15thNight
50%5%10%18%12%1
1260
16th to endNight
46%413%24%10%1
1260
July1st to 15thNight
42%7%15%25%8%
1190
16th to endNight
42%6%15%30%5%
1268
August1st to 15thNight
46%7%17%22%4
1607
16th to endNight
42%5%19%26%6%
1719
September1st to 15thNight
50%5%16%19%7%
1818
16th to endNight
46%5%17%26%4
1815
October1st to 15thNight
56%5%14%17%6%
1972
16th to endNight
72%5%7%10%3
2214
November1st to 15thNight
69%5%10%10%3
2433
16th to endNight
75%39%8%3
2520
December1st to 15thNight
77%48%8%1
2694
16th to endNight
78%47%5%2
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
30%11%36%11%10%
60
16th to endDay
39%431%15%7%
88
February1st to 15thDay
23%14%35%26%
90
16th to endDay
33%19%33%12%1
81
March1st to 15thDay
23%13%35%20%6%
203
16th to endDay
21%17%29%20%9%2
288
April1st to 15thDay
25%18%28%19%5%1
270
16th to endDay
26%15%30%14%7%5%
270
May1st to 15thDay
26%15%23%23%6%4
288
16th to endDay
30%11%29%18%7%1
468
June1st to 15thDay
27%11%28%19%9%2
495
16th to endDay
24%10%28%22%12%1
495
July1st to 15thDay
20%10%33%24%8%2
475
16th to endDay
15%10%29%28%11%4
515
August1st to 15thDay
20%6%28%22%14%6%
316
16th to endDay
27%7%24%21%12%7%
332
September1st to 15thDay
23%7%29%21%12%5%
311
16th to endDay
29%9%27%20%9%3
254
October1st to 15thDay
31%12%28%17%7%1
255
16th to endDay
35%15%30%12%5%1
170
November1st to 15thDay
31%15%38%12%1
63
16th to endDay
41%23%21%11%1
60
December1st to 15thDay
28%8%43%15%31
60
16th to endDay
35%17%39%43
64
January1st to 15thNight
28%14%30%18%5%1
900
16th to endNight
20%13%28%25%10%1
951
February1st to 15thNight
16%9%35%27%9%
704
16th to endNight
23%10%33%23%8%
631
March1st to 15thNight
23%18%29%21%6%
720
16th to endNight
20%10%32%26%8%1
768
April1st to 15thNight
27%13%27%23%7%
617
16th to endNight
23%9%31%24%10%
540
May1st to 15thNight
21%8%30%31%7%
438
16th to endNight
23%5%32%28%7%1
375
June1st to 15thNight
24%10%24%29%11%
360
16th to endNight
17%6%30%32%11%
360
July1st to 15thNight
17%6%31%30%12%
340
16th to endNight
17%425%35%15%1
406
August1st to 15thNight
16%325%31%19%2
539
16th to endNight
20%5%26%29%16%1
573
September1st to 15thNight
24%8%27%21%16%2
684
16th to endNight
26%7%27%24%11%2
657
October1st to 15thNight
29%10%30%20%8%
660
16th to endNight
37%10%25%17%7%1
704
November1st to 15thNight
31%16%29%17%5%
700
16th to endNight
36%10%30%18%4
720
December1st to 15thNight
27%14%32%18%5%
894
16th to endNight
30%12%28%19%6%
960
Page generated at 2017-09-16 00:58:33. Version ac04

Copyright 2017 A. Danko


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