Peachland
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Peachland 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%
15050
11%
47597
8%
15022
44%
15022
19%
32700

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
23%
733
6%
2583
5%
729
25%
729
7%
2125
January16th to endNight
29%
768
6%
2688
4%
768
33%
768
9%
2130
February1st to 15thNight
31%
697
8%
2374
6%
697
34%
697
11%
1812
February16th to endNight
40%
632
11%
1972
7%
632
46%
632
18%
1383
March1st to 15thNight
31%
720
8%
2157
5%
720
35%
720
14%
1596
March16th to endNight
32%
768
11%
2003
5%
768
37%
768
18%
1471
April1st to 15thNight
39%
719
10%
1799
4%
719
42%
719
22%
1294
April16th to endNight
40%
502
13%
1582
9%
502
45%
502
23%
1044
May1st to 15thNight
45%
359
12%
1439
16%
359
52%
359
22%
828
May16th to endNight
51%
374
7%
1496
9%
374
53%
374
18%
938
June1st to 15thNight
43%
360
4%
1185
1%
360
43%
360
22%
759
June16th to endNight
42%
360
7%
1080
0%
360
42%
360
30%
647
July1st to 15thNight
60%
340
9%
1210
4%
340
63%
340
38%
586
July16th to endNight
64%
376
16%
1416
19%
354
72%
354
45%
585
August1st to 15thNight
73%
360
22%
1432
29%
358
79%
358
44%
607
August16th to endNight
59%
635
25%
1781
17%
635
64%
635
47%
928
September1st to 15thNight
61%
720
24%
1800
12%
720
66%
720
49%
1000
September16th to endNight
55%
716
22%
1944
15%
716
59%
716
35%
1182
October1st to 15thNight
52%
720
14%
2160
12%
720
56%
720
27%
1355
October16th to endNight
41%
768
13%
2465
9%
768
48%
768
19%
1684
November1st to 15thNight
30%
760
9%
2600
7%
760
34%
760
12%
1965
November16th to endNight
27%
823
7%
2773
3%
823
32%
823
9%
2187
December1st to 15thNight
28%
910
9%
2730
5%
910
31%
910
11%
2196
December16th to endNight
21%
930
8%
2928
3%
930
27%
930
8%
2398

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%9%47%6%45%5%6%7%33%
48855
Night
9%10%47%6%35%5%5%6%35%
47757
Cloud CoverDay
8%8%37%7%46%5%6%7%34%
48855
Night
9%9%47%6%35%5%5%6%34%
47760
TransparencyDay
46%7%16%18%9%1
48518
Night
47%7%16%19%8%1
47598
SeeingDay
14%17%30%23%12%2
6315
Night
14%9%26%29%17%2
15059

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
11%15%5%11%6%5%46%6%5%21%
1352
16th to endDay
10%15%5%7%6%445%7%7%25%
1536
February1st to 15thDay
8%16%5%10%9%36%45%6%22%
1489
16th to endDay
9%11%5%10%8%46%7%6%8%22%
1502
March1st to 15thDay
9%12%49%7%46%6%6%7%24%
1802
16th to endDay
7%13%6%9%7%5%7%6%7%6%19%
2220
April1st to 15thDay
10%12%5%9%7%47%6%6%7%22%
2149
16th to endDay
7%10%49%7%5%7%5%6%7%27%
2376
May1st to 15thDay
9%9%47%6%46%6%6%6%32%
2511
16th to endDay
12%8%48%8%5%7%5%6%8%25%
2615
June1st to 15thDay
15%8%48%7%5%6%5%5%7%25%
2769
16th to endDay
11%5%37%7%46%5%5%7%34%
2880
July1st to 15thDay
5%425%5%35%5%5%6%50%
2673
16th to endDay
4314435%446%55%
2657
August1st to 15thDay
4315%5%345%7%8%51%
2520
16th to endDay
5%4245%345%5%8%49%
2419
September1st to 15thDay
5%425%424335%55%
2160
16th to endDay
10%6%246%35%5%6%6%42%
2014
October1st to 15thDay
10%8%37%5%345%6%6%36%
1800
16th to endDay
16%8%47%6%45%45%7%31%
1758
November1st to 15thDay
14%13%6%8%7%45%46%5%23%
1586
16th to endDay
11%16%7%7%6%45%5%5%5%22%
1501
December1st to 15thDay
9%11%7%11%9%3437%6%26%
1267
16th to endDay
13%17%5%8%7%35%5%46%20%
1299
January1st to 15thNight
14%16%6%12%8%35%45%5%17%
2583
16th to endNight
12%16%6%8%6%35%45%7%21%
2688
February1st to 15thNight
12%15%5%7%7%45%445%25%
2362
16th to endNight
8%11%5%8%6%45%5%6%7%32%
1972
March1st to 15thNight
10%10%5%8%7%37%5%5%6%29%
2157
16th to endNight
7%9%48%8%46%5%6%6%30%
1999
April1st to 15thNight
6%8%39%7%45%7%7%7%31%
1799
16th to endNight
5%9%47%7%46%6%6%7%34%
1582
May1st to 15thNight
7%5%37%5%26%45%7%43%
1439
16th to endNight
12%6%27%6%45%5%5%9%35%
1496
June1st to 15thNight
9%5%37%7%347%7%10%34%
1185
16th to endNight
7%426%7%335%6%7%44%
1080
July1st to 15thNight
22134235%6%8%59%
1282
16th to endNight
3122235%47%65%
1512
August1st to 15thNight
221332445%7%63%
1440
16th to endNight
3344345%5%8%56%
1781
September1st to 15thNight
5%32332345%6%60%
1800
16th to endNight
7%5%2443446%9%47%
1944
October1st to 15thNight
9%6%25%5%35%45%6%45%
2160
16th to endNight
14%8%36%6%345%5%7%35%
2465
November1st to 15thNight
16%11%47%6%36%5%5%7%25%
2600
16th to endNight
13%16%7%10%6%35%45%423%
2773
December1st to 15thNight
10%16%6%10%7%3445%5%23%
2730
16th to endNight
14%17%5%9%7%45%445%20%
2928

Percentage Cloud Cover SW (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
11%14%5%11%7%47%5%6%7%17%
1352
16th to endDay
9%16%48%8%47%6%5%6%22%
1536
February1st to 15thDay
9%13%6%9%8%46%5%5%7%22%
1489
16th to endDay
8%9%5%10%7%5%7%6%7%7%24%
1502
March1st to 15thDay
8%11%48%8%5%5%6%6%10%24%
1802
16th to endDay
7%11%5%9%9%6%8%6%7%8%20%
2220
April1st to 15thDay
9%9%48%7%47%6%8%8%23%
2149
16th to endDay
7%9%48%7%47%6%6%8%29%
2376
May1st to 15thDay
8%8%37%6%36%7%5%8%33%
2511
16th to endDay
11%7%37%8%46%7%6%9%27%
2615
June1st to 15thDay
14%8%38%6%36%6%6%6%27%
2769
16th to endDay
10%5%36%6%5%6%5%6%7%36%
2880
July1st to 15thDay
5%324435%5%6%7%51%
2673
16th to endDay
4213425%46%6%57%
2657
August1st to 15thDay
32135%35%5%6%9%52%
2520
16th to endDay
5%3145%35%5%5%8%51%
2419
September1st to 15thDay
5%325%5%33437%56%
2160
16th to endDay
9%425%5%445%5%8%43%
2014
October1st to 15thDay
9%7%36%6%345%5%7%38%
1800
16th to endDay
14%10%36%7%45%5%47%31%
1758
November1st to 15thDay
14%11%5%8%7%45%5%5%7%23%
1586
16th to endDay
12%14%6%9%7%5%5%5%45%22%
1501
December1st to 15thDay
9%10%8%10%8%37%447%24%
1267
16th to endDay
12%16%6%10%7%346%5%7%19%
1299
January1st to 15thNight
14%16%7%11%7%46%5%5%5%14%
2582
16th to endNight
11%17%5%9%8%37%5%5%5%19%
2688
February1st to 15thNight
12%15%5%7%6%45%46%5%23%
2362
16th to endNight
7%10%5%8%6%46%5%5%8%31%
1972
March1st to 15thNight
10%10%39%7%46%5%5%8%28%
2157
16th to endNight
7%8%49%8%46%5%7%8%30%
2003
April1st to 15thNight
6%8%37%6%46%6%6%8%33%
1799
16th to endNight
5%7%46%7%36%6%8%7%35%
1582
May1st to 15thNight
8%435%5%45%5%5%8%43%
1439
16th to endNight
11%6%45%6%45%6%5%8%35%
1496
June1st to 15thNight
9%6%35%6%35%5%8%8%35%
1185
16th to endNight
6%425%5%36%6%7%7%44%
1080
July1st to 15thNight
221243446%8%61%
1282
16th to endNight
311121445%7%65%
1512
August1st to 15thNight
21231445%7%64%
1440
16th to endNight
221342445%8%58%
1781
September1st to 15thNight
431332335%6%61%
1800
16th to endNight
6%42442447%8%49%
1944
October1st to 15thNight
8%5%25%5%45%5%5%5%46%
2160
16th to endNight
13%7%36%6%245%5%7%36%
2465
November1st to 15thNight
15%11%48%6%45%5%6%6%26%
2600
16th to endNight
13%15%7%9%7%46%44421%
2773
December1st to 15thNight
11%15%5%11%8%45%445%21%
2730
16th to endNight
14%17%7%9%7%36%5%45%18%
2928

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
61%10%14%9%3
1352
16th to endDay
57%6%16%14%21
1536
February1st to 15thDay
60%10%15%11%2
1489
16th to endDay
54%8%18%12%6%
1502
March1st to 15thDay
52%10%18%14%3
1802
16th to endDay
58%7%18%12%3
2220
April1st to 15thDay
54%8%17%15%3
2149
16th to endDay
49%8%18%17%5%
2376
May1st to 15thDay
45%6%16%19%11%
2511
16th to endDay
50%8%18%18%4
2619
June1st to 15thDay
53%5%16%15%7%2
2769
16th to endDay
44%6%16%19%11%
2880
July1st to 15thDay
31%5%13%23%19%6%
2516
16th to endDay
25%6%13%26%22%5%
2490
August1st to 15thDay
26%5%17%29%16%4
2503
16th to endDay
29%417%29%16%2
2419
September1st to 15thDay
28%5%15%25%23%2
2160
16th to endDay
37%6%19%22%11%1
2014
October1st to 15thDay
42%6%20%24%6%
1800
16th to endDay
51%8%17%19%4
1758
November1st to 15thDay
57%9%14%13%3
1586
16th to endDay
60%9%12%13%4
1501
December1st to 15thDay
58%8%15%15%2
1267
16th to endDay
62%9%13%12%2
1299
January1st to 15thNight
68%6%12%8%4
2583
16th to endNight
63%7%13%11%3
2688
February1st to 15thNight
59%6%15%13%3
2374
16th to endNight
48%7%19%18%6%
1972
March1st to 15thNight
51%9%19%15%3
2157
16th to endNight
49%8%19%18%4
2003
April1st to 15thNight
45%8%20%19%5%
1799
16th to endNight
42%7%23%23%4
1582
May1st to 15thNight
36%6%19%22%13%1
1440
16th to endNight
43%7%22%21%5%
1496
June1st to 15thNight
41%7%18%23%6%2
1185
16th to endNight
34%5%23%25%10%
1080
July1st to 15thNight
21%5%15%29%20%6%
1210
16th to endNight
15%5%16%29%26%5%
1416
August1st to 15thNight
18%416%34%20%5%
1432
16th to endNight
21%417%33%19%3
1781
September1st to 15thNight
22%317%30%22%4
1800
16th to endNight
31%7%17%26%13%3
1944
October1st to 15thNight
37%6%19%25%10%
2160
16th to endNight
45%7%18%23%4
2465
November1st to 15thNight
55%9%15%14%4
2600
16th to endNight
63%6%13%11%4
2773
December1st to 15thNight
63%7%12%14%1
2730
16th to endNight
66%6%11%11%3
2928

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
10%5%20%25%31%8%
60
16th to endDay
32%9%18%26%10%1
64
February1st to 15thDay
12%16%36%26%8%1
149
16th to endDay
13%15%36%24%10%
225
March1st to 15thDay
18%33%33%11%3
270
16th to endDay
20%27%36%12%3
288
April1st to 15thDay
23%23%28%15%8%1
269
16th to endDay
15%29%31%15%6%2
270
May1st to 15thDay
18%18%33%18%9%1
288
16th to endDay
18%14%25%22%15%3
330
June1st to 15thDay
17%13%28%24%14%2
564
16th to endDay
13%16%30%24%13%1
675
July1st to 15thDay
7%13%32%30%14%2
450
16th to endDay
6%15%28%32%12%3
327
August1st to 15thDay
5%10%27%32%20%4
315
16th to endDay
7%15%29%30%13%3
332
September1st to 15thDay
7%20%25%28%13%4
315
16th to endDay
14%13%33%21%14%2
315
October1st to 15thDay
13%20%32%20%11%1
315
16th to endDay
24%9%27%26%10%1
174
November1st to 15thDay
20%17%32%23%5%
104
16th to endDay
23%20%24%15%10%6%
90
December1st to 15thDay
17%14%24%30%8%4
62
16th to endDay
7%20%26%28%15%1
64
January1st to 15thNight
22%11%28%24%11%1
733
16th to endNight
17%8%30%27%12%3
768
February1st to 15thNight
21%8%23%30%12%3
704
16th to endNight
13%11%25%28%19%2
632
March1st to 15thNight
14%11%31%27%13%1
720
16th to endNight
11%13%31%29%11%2
768
April1st to 15thNight
11%11%25%31%16%2
719
16th to endNight
9%10%32%30%15%1
502
May1st to 15thNight
10%11%24%32%18%1
360
16th to endNight
14%6%20%33%24%1
375
June1st to 15thNight
11%8%29%31%17%1
360
16th to endNight
8%7%33%31%15%2
360
July1st to 15thNight
39%22%39%24%1
340
16th to endNight
39%21%36%26%2
376
August1st to 15thNight
4315%36%35%5%
360
16th to endNight
45%25%30%29%3
635
September1st to 15thNight
5%8%20%25%29%10%
720
16th to endNight
9%423%29%26%6%
716
October1st to 15thNight
12%8%19%32%21%4
720
16th to endNight
20%7%22%29%16%2
768
November1st to 15thNight
22%9%30%27%9%1
760
16th to endNight
22%11%26%26%10%3
823
December1st to 15thNight
19%7%31%28%11%1
910
16th to endNight
21%9%32%28%7%
930
Page generated at 2017-12-03 08:16:48. Version ac04

Copyright 2017 A. Danko


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