Takhini Hot Springs
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Takhini Hot Springs clear sky chart from 2005-11-06 to 2024-03-08.

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%
22532
6%
82219
5%
22434
42%
22434
11%
63438

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 10thNight
41%
960
5%
5561
8%
945
44%
945
5%
4813
January11th to 20thNight
29%
835
11%
5112
4%
820
34%
820
5%
3811
January21st to endNight
33%
923
6%
5548
6%
902
37%
902
5%
4459
February1st to 10thNight
42%
850
9%
2850
7%
850
45%
850
13%
2173
February11th to 20thNight
37%
834
9%
2592
5%
830
40%
830
13%
2024
February21st to endNight
44%
703
11%
2064
9%
703
45%
703
16%
1547
March1st to 10thNight
45%
770
14%
2291
13%
770
47%
770
18%
1695
March11th to 20thNight
41%
644
8%
2084
8%
644
41%
644
14%
1563
March21st to endNight
48%
594
9%
2011
10%
594
49%
594
15%
1460
April1st to 10thNight
52%
540
6%
1771
6%
540
53%
540
18%
1252
April11th to 20thNight
49%
533
8%
1423
5%
533
51%
533
22%
1033
April21st to endNight
53%
540
1%
1440
1%
540
54%
540
24%
1012
May1st to 10thNight
50%
366
0%
1118
0%
366
50%
366
21%
751
May11th to 20thNight
50%
354
0%
1062
0%
354
50%
354
23%
705
May21st to endNight
58%
312
0%
981
0%
312
58%
312
26%
622
June1st to 10thNight
52%
180
0%
720
0%
180
52%
180
18%
464
June11th to 20thNight
50%
180
0%
720
0%
180
50%
180
13%
511
June21st to endNight
55%
180
0%
720
0%
180
55%
180
17%
472
July1st to 10thNight
56%
175
0%
700
0%
175
56%
175
19%
430
July11th to 20thNight
51%
174
0%
832
0%
174
51%
174
12%
571
July21st to endNight
48%
394
0%
1116
0%
372
47%
372
21%
776
August1st to 10thNight
50%
401
0%
1111
0%
399
50%
399
22%
769
August11th to 20thNight
41%
534
1%
1376
1%
534
42%
534
18%
1035
August21st to endNight
42%
594
3%
1584
2%
594
42%
594
16%
1237
September1st to 10thNight
43%
540
7%
1751
6%
540
44%
540
14%
1303
September11th to 20thNight
48%
540
12%
1800
12%
540
50%
540
20%
1202
September21st to endNight
34%
700
9%
2045
6%
700
37%
700
13%
1574
October1st to 10thNight
35%
720
9%
2160
7%
720
36%
720
13%
1687
October11th to 20thNight
32%
729
7%
2350
6%
729
33%
729
11%
1857
October21st to endNight
37%
891
5%
2776
3%
891
39%
891
11%
2231
November1st to 10thNight
33%
830
5%
2776
5%
830
35%
830
8%
2332
November11th to 20thNight
30%
850
4%
3039
3%
850
32%
850
6%
2590
November21st to endNight
31%
950
5%
3140
3%
950
33%
950
9%
2584
December1st to 10thNight
31%
1040
5%
3334
4%
1040
34%
1040
8%
2845
December11th to 20thNight
37%
1039
8%
4135
5%
1039
40%
1039
8%
3300
December21st to endNight
37%
1133
4%
6126
7%
1114
39%
1114
6%
4748

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
9%11%5%10%9%5%7%6%7%8%23%
76808
Night
6%12%6%11%10%6%8%7%7%8%21%
82703
TransparencyDay
56%10%15%14%5%
76460
Night
56%11%13%14%5%1
82632
SeeingDay
14%11%23%28%18%6%
16073
Night
10%7%24%34%22%4
22591

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 10thDay
17%5%13%16%10%12%10%9%8%10%
1390
11th to 20thDay
311%8%16%11%6%7%6%5%9%18%
1692
21st to endDay
5%21%9%15%12%5%6%5%6%6%11%
2094
February1st to 10thDay
212%7%12%9%7%8%7%7%9%21%
1330
11th to 20thDay
414%7%10%9%6%5%7%7%8%23%
1477
21st to endDay
111%5%14%12%7%6%7%7%6%24%
1389
March1st to 10thDay
28%6%13%11%7%7%7%8%6%25%
1829
11th to 20thDay
211%6%13%11%5%6%7%7%8%23%
1876
21st to endDay
29%7%12%11%6%7%5%6%8%27%
2345
April1st to 10thDay
312%6%13%9%47%6%7%9%23%
2186
11th to 20thDay
412%6%10%9%5%6%6%5%9%26%
2486
21st to endDay
5%12%7%12%9%47%6%6%7%25%
2520
May1st to 10thDay
10%12%5%9%8%47%6%6%8%24%
2839
11th to 20thDay
9%12%5%9%7%46%7%5%6%29%
2833
21st to endDay
8%9%49%9%5%7%6%7%8%29%
3290
June1st to 10thDay
12%10%48%8%5%7%6%6%9%25%
3240
11th to 20thDay
13%11%5%9%9%46%5%6%8%22%
3240
21st to endDay
9%8%5%9%10%5%8%7%8%8%23%
3240
July1st to 10thDay
12%8%48%8%5%7%6%7%8%27%
3240
11th to 20thDay
15%9%5%9%9%5%9%7%7%8%18%
3099
21st to endDay
13%8%48%7%5%7%6%6%8%27%
3135
August1st to 10thDay
13%8%38%7%5%6%6%6%8%30%
2820
11th to 20thDay
18%10%47%7%46%6%6%8%24%
2524
21st to endDay
18%11%49%8%46%6%6%7%21%
2772
September1st to 10thDay
17%13%5%9%8%45%5%5%6%24%
2206
11th to 20thDay
11%10%48%7%46%5%7%7%30%
2160
21st to endDay
13%14%5%9%8%46%6%5%7%21%
1915
October1st to 10thDay
11%13%411%8%5%7%6%6%7%22%
1800
11th to 20thDay
11%16%6%11%7%47%5%5%7%21%
1607
21st to endDay
6%13%7%11%10%6%7%6%7%7%21%
1580
November1st to 10thDay
5%16%7%14%11%6%9%7%5%6%15%
1302
11th to 20thDay
5%14%10%16%15%6%7%5%6%6%12%
1140
21st to endDay
214%6%15%12%8%8%9%8%6%13%
1020
December1st to 10thDay
411%5%14%14%6%10%9%7%9%10%
844
11th to 20thDay
211%5%10%12%5%10%9%8%13%15%
962
21st to endDay
8%12%49%11%5%9%10%9%8%14%
1386
January1st to 10thNight
212%5%11%15%10%12%9%6%6%11%
5586
11th to 20thNight
313%8%15%10%5%6%7%10%12%13%
5206
21st to endNight
7%18%7%13%11%6%7%6%5%6%14%
5560
February1st to 10thNight
411%5%11%11%5%9%7%7%8%22%
2850
11th to 20thNight
212%6%12%11%6%8%7%7%7%22%
2589
21st to endNight
310%6%11%10%47%8%6%8%26%
2064
March1st to 10thNight
29%5%13%9%6%7%6%5%8%30%
2291
11th to 20thNight
211%6%13%10%6%8%8%6%6%23%
2082
21st to endNight
29%8%12%9%5%7%5%7%7%29%
2011
April1st to 10thNight
110%6%12%8%5%7%6%6%8%30%
1771
11th to 20thNight
39%410%9%5%7%7%6%10%29%
1423
21st to endNight
5%9%47%8%5%7%6%8%9%34%
1440
May1st to 10thNight
6%6%47%6%48%8%9%10%33%
1118
11th to 20thNight
7%7%48%6%45%6%8%10%34%
1062
21st to endNight
6%6%47%6%46%6%7%8%41%
981
June1st to 10thNight
12%6%47%8%46%6%6%9%34%
720
11th to 20thNight
12%8%39%9%5%6%8%8%9%24%
720
21st to endNight
7%7%27%7%47%9%10%10%29%
720
July1st to 10thNight
11%5%35%6%47%6%8%10%34%
720
11th to 20thNight
11%8%46%8%5%7%8%6%10%28%
859
21st to endNight
12%7%47%6%35%7%8%10%32%
1182
August1st to 10thNight
9%6%26%7%46%6%9%11%34%
1117
11th to 20thNight
14%9%37%5%5%7%7%7%8%28%
1376
21st to endNight
18%10%49%5%46%5%6%6%27%
1584
September1st to 10thNight
13%7%48%9%5%7%6%6%6%28%
1751
11th to 20thNight
8%8%48%7%36%6%6%8%36%
1800
21st to endNight
13%14%49%8%5%6%5%6%8%23%
2045
October1st to 10thNight
11%15%39%7%46%6%6%6%25%
2160
11th to 20thNight
12%16%6%10%9%45%5%5%7%23%
2350
21st to endNight
6%15%6%11%10%47%6%6%7%22%
2776
November1st to 10thNight
5%14%8%14%11%5%7%7%7%7%14%
2776
11th to 20thNight
5%14%9%14%14%6%7%8%6%6%12%
3039
21st to endNight
413%7%13%13%6%9%8%7%8%13%
3140
December1st to 10thNight
5%12%6%14%13%8%9%6%7%7%13%
3334
11th to 20thNight
312%7%13%10%6%9%8%7%8%16%
4230
21st to endNight
5%17%6%11%9%5%8%8%8%7%16%
6270

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 10thDay
65%13%8%8%6%
1390
11th to 20thDay
61%11%8%12%8%1
1708
21st to endDay
67%10%10%9%4
2094
February1st to 10thDay
56%10%10%12%11%1
1330
11th to 20thDay
52%12%13%12%10%
1485
21st to endDay
56%10%13%15%6%
1389
March1st to 10thDay
53%9%13%19%5%1
1829
11th to 20thDay
54%9%15%15%7%
1876
21st to endDay
52%9%17%13%8%
2345
April1st to 10thDay
53%10%19%13%5%
2186
11th to 20thDay
53%10%14%17%6%
2486
21st to endDay
55%9%14%16%6%
2520
May1st to 10thDay
55%11%16%16%3
2839
11th to 20thDay
51%8%10%21%9%
2836
21st to endDay
48%9%18%19%7%
3291
June1st to 10thDay
53%8%16%17%6%1
3240
11th to 20thDay
57%9%15%15%3
3240
21st to endDay
54%10%17%16%3
3240
July1st to 10thDay
48%10%19%16%6%1
3151
11th to 20thDay
58%13%18%9%2
3003
21st to endDay
51%11%21%15%2
2961
August1st to 10thDay
48%11%23%15%3
2801
11th to 20thDay
57%10%16%15%2
2524
21st to endDay
59%11%18%12%1
2772
September1st to 10thDay
59%10%14%14%2
2206
11th to 20thDay
49%10%19%19%3
2160
21st to endDay
60%9%15%14%3
1915
October1st to 10thDay
58%11%13%15%3
1800
11th to 20thDay
62%10%15%11%2
1607
21st to endDay
59%13%17%10%2
1580
November1st to 10thDay
67%12%11%8%2
1302
11th to 20thDay
72%7%9%10%1
1140
21st to endDay
65%12%11%7%5%
1020
December1st to 10thDay
66%13%13%7%2
844
11th to 20thDay
54%11%9%15%10%
964
21st to endDay
59%15%9%10%7%
1386
January1st to 10thNight
69%12%7%7%4
5586
11th to 20thNight
59%9%8%11%10%3
5252
21st to endNight
66%10%10%10%41
5560
February1st to 10thNight
55%10%10%14%8%2
2850
11th to 20thNight
53%14%12%12%7%1
2592
21st to endNight
52%10%14%17%7%
2064
March1st to 10thNight
50%10%11%20%8%1
2291
11th to 20thNight
54%10%13%16%7%
2084
21st to endNight
51%9%16%14%9%
2011
April1st to 10thNight
47%10%19%18%5%
1771
11th to 20thNight
47%10%15%22%6%
1423
21st to endNight
40%12%16%23%8%
1440
May1st to 10thNight
39%12%21%22%5%
1118
11th to 20thNight
39%11%14%22%14%1
1062
21st to endNight
38%9%18%26%9%
981
June1st to 10thNight
45%8%17%23%7%
720
11th to 20thNight
50%11%18%18%3
720
21st to endNight
40%14%23%19%4
720
July1st to 10thNight
40%10%20%24%6%
700
11th to 20thNight
46%13%18%20%2
832
21st to endNight
41%13%24%18%4
1116
August1st to 10thNight
39%14%23%20%4
1111
11th to 20thNight
48%12%18%18%3
1376
21st to endNight
54%11%21%13%1
1584
September1st to 10thNight
50%12%18%17%2
1751
11th to 20thNight
42%10%22%21%4
1800
21st to endNight
58%8%15%16%4
2045
October1st to 10thNight
57%10%14%16%3
2160
11th to 20thNight
58%11%15%13%2
2350
21st to endNight
58%13%16%10%2
2776
November1st to 10thNight
65%12%13%8%2
2776
11th to 20thNight
69%10%10%9%2
3039
21st to endNight
63%11%11%12%3
3140
December1st to 10thNight
66%12%12%7%2
3334
11th to 20thNight
60%11%11%11%6%1
4227
21st to endNight
58%13%8%10%10%2
6270

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 10thDay
3317%37%33%7%
90
11th to 20thDay
9%6%13%37%19%17%
126
21st to endDay
8%12%19%38%16%6%
202
February1st to 10thDay
9%6%24%36%18%7%
370
11th to 20thDay
7%9%26%34%17%7%
365
21st to endDay
8%11%27%34%16%5%
307
March1st to 10thDay
5%9%28%31%18%9%
362
11th to 20thDay
6%11%31%29%21%3
340
21st to endDay
7%11%26%31%20%5%
449
April1st to 10thDay
7%16%26%30%16%5%
446
11th to 20thDay
11%13%25%26%19%6%
590
21st to endDay
11%18%26%30%12%3
600
May1st to 10thDay
17%20%27%25%8%3
603
11th to 20thDay
13%14%25%26%15%7%
625
21st to endDay
12%13%25%27%18%5%
787
June1st to 10thDay
15%9%21%27%22%5%
810
11th to 20thDay
17%10%20%26%21%5%
810
21st to endDay
11%8%18%31%25%8%
810
July1st to 10thDay
15%7%16%30%24%8%
796
11th to 20thDay
17%9%17%28%23%6%
654
21st to endDay
16%7%19%24%26%8%
684
August1st to 10thDay
16%9%21%28%18%9%
626
11th to 20thDay
24%12%25%23%14%3
615
21st to endDay
24%8%23%27%15%4
693
September1st to 10thDay
27%13%20%18%16%6%
485
11th to 20thDay
14%13%21%25%19%8%
450
21st to endDay
22%18%25%21%11%4
408
October1st to 10thDay
21%16%27%21%11%4
360
11th to 20thDay
20%17%24%23%11%5%
360
21st to endDay
12%9%24%32%18%5%
392
November1st to 10thDay
11%9%31%27%19%3
180
11th to 20thDay
10%6%18%34%26%7%
180
21st to endDay
6%6%30%34%14%11%
180
December1st to 10thDay
36%19%42%22%9%
129
11th to 20thDay
7%8%17%36%24%9%
90
21st to endDay
5%423%37%18%12%
99
January1st to 10thNight
5%423%40%23%5%
979
11th to 20thNight
8%6%29%34%19%4
850
21st to endNight
9%7%28%38%16%3
935
February1st to 10thNight
7%6%24%43%18%2
850
11th to 20thNight
5%6%32%37%15%4
834
21st to endNight
7%6%23%42%18%3
703
March1st to 10thNight
37%26%35%25%4
770
11th to 20thNight
5%6%25%36%24%4
644
21st to endNight
38%19%30%35%5%
594
April1st to 10thNight
47%20%36%29%4
540
11th to 20thNight
6%6%20%31%31%6%
533
21st to endNight
8%7%19%32%30%4
540
May1st to 10thNight
7%11%22%30%25%4
366
11th to 20thNight
10%7%20%34%27%1
354
21st to endNight
7%419%36%32%2
313
June1st to 10thNight
11%6%19%39%23%2
180
11th to 20thNight
12%322%33%27%2
180
21st to endNight
8%5%19%34%31%2
180
July1st to 10thNight
12%419%30%31%4
175
11th to 20thNight
12%5%16%28%36%4
174
21st to endNight
12%6%22%31%25%5%
394
August1st to 10thNight
12%7%18%34%24%5%
401
11th to 20thNight
19%8%23%28%18%4
534
21st to endNight
22%419%27%24%4
594
September1st to 10thNight
17%9%20%27%24%3
540
11th to 20thNight
11%6%22%30%26%4
540
21st to endNight
19%13%22%29%14%3
700
October1st to 10thNight
19%10%24%28%17%2
720
11th to 20thNight
19%9%21%29%18%3
729
21st to endNight
11%8%26%33%19%2
891
November1st to 10thNight
9%7%25%38%17%4
830
11th to 20thNight
10%7%22%33%22%5%
850
21st to endNight
8%8%28%34%18%4
950
December1st to 10thNight
9%7%25%37%18%4
1040
11th to 20thNight
9%7%23%36%20%5%
1040
21st to endNight
9%7%24%36%19%6%
1144
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