Pinhey's Point
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pinhey's Point clear sky chart from 2005-11-06 to 2024-01-12.

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
29%
22559
14%
74727
9%
22516
37%
22516
16%
52779

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
14%
760
8%
2649
2%
757
21%
757
8%
2125
January11th to 20thNight
19%
727
9%
2541
5%
727
24%
727
8%
1994
January21st to endNight
22%
792
14%
2696
8%
792
31%
792
14%
1931
February1st to 10thNight
16%
720
10%
2340
3%
720
25%
720
10%
1795
February11th to 20thNight
17%
703
14%
2275
5%
700
29%
700
13%
1650
February21st to endNight
24%
592
15%
1778
8%
592
34%
592
14%
1308
March1st to 10thNight
21%
720
14%
2153
8%
720
29%
720
15%
1592
March11th to 20thNight
22%
720
16%
1979
7%
720
32%
720
17%
1435
March21st to endNight
27%
792
21%
2066
8%
792
35%
792
20%
1440
April1st to 10thNight
24%
720
15%
1800
5%
720
29%
720
19%
1325
April11th to 20thNight
25%
711
18%
1775
6%
711
31%
711
21%
1276
April21st to endNight
27%
604
16%
1684
7%
604
34%
604
18%
1227
May1st to 10thNight
35%
360
18%
1440
16%
360
44%
360
17%
927
May11th to 20thNight
33%
354
21%
1416
17%
354
50%
354
19%
873
May21st to endNight
37%
389
13%
1551
11%
388
49%
388
24%
912
June1st to 10thNight
40%
360
11%
1440
11%
360
48%
360
19%
922
June11th to 20thNight
42%
360
13%
1440
16%
360
50%
360
22%
834
June21st to endNight
41%
360
11%
1440
13%
360
49%
360
18%
908
July1st to 10thNight
51%
350
15%
1400
19%
350
60%
350
26%
783
July11th to 20thNight
51%
348
16%
1392
23%
348
57%
348
24%
796
July21st to endNight
54%
394
15%
1486
18%
372
59%
372
25%
839
August1st to 10thNight
52%
397
16%
1461
15%
395
59%
395
24%
871
August11th to 20thNight
57%
534
19%
1598
14%
534
60%
534
33%
987
August21st to endNight
47%
792
18%
1980
8%
792
51%
792
32%
1294
September1st to 10thNight
45%
720
17%
1800
8%
720
48%
720
33%
1185
September11th to 20thNight
50%
720
22%
1800
13%
720
54%
720
35%
1157
September21st to endNight
42%
720
22%
2036
15%
720
48%
720
27%
1332
October1st to 10thNight
35%
720
17%
2160
11%
720
43%
720
20%
1475
October11th to 20thNight
26%
720
14%
2160
8%
720
35%
720
16%
1584
October21st to endNight
25%
792
13%
2515
8%
792
33%
792
14%
1865
November1st to 10thNight
29%
740
16%
2407
10%
740
36%
740
17%
1664
November11th to 20thNight
22%
760
16%
2660
9%
760
32%
760
14%
1916
November21st to endNight
20%
760
10%
2660
5%
760
27%
760
10%
2029
December1st to 10thNight
18%
760
8%
2660
4%
760
24%
760
8%
2149
December11th to 20thNight
17%
759
12%
3243
6%
759
27%
759
9%
2438
December21st to endNight
13%
829
6%
4846
2%
817
20%
817
4%
3941

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
17%9%47%6%35%5%5%7%33%
74724
Night
18%10%47%6%3445%6%32%
74982
TransparencyDay
51%5%12%21%10%1
74429
Night
53%5%11%20%10%1
74811
SeeingDay
22%15%30%20%10%3
13343
Night
23%12%29%26%10%1
22567

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 10thDay
17%17%7%10%6%445%45%21%
1517
11th to 20thDay
20%14%6%10%7%45%35%423%
1448
21st to endDay
13%14%5%9%7%5%5%5%6%6%25%
1656
February1st to 10thDay
14%16%5%11%8%45%5%45%24%
1620
11th to 20thDay
13%14%6%9%6%35%5%46%29%
1573
21st to endDay
20%13%48%7%345%6%5%25%
1476
March1st to 10thDay
16%10%5%7%8%45%5%5%6%29%
1801
11th to 20thDay
16%11%5%8%6%45%446%31%
1980
21st to endDay
19%9%36%6%33446%37%
2290
April1st to 10thDay
22%11%46%434447%32%
2160
11th to 20thDay
22%8%36%5%24445%37%
2134
21st to endDay
22%9%47%6%33445%31%
2291
May1st to 10thDay
20%7%36%5%4445%6%35%
2520
11th to 20thDay
16%6%36%6%35%447%39%
2478
21st to endDay
16%6%35%7%36%6%5%7%37%
2725
June1st to 10thDay
21%7%37%5%46%5%5%7%30%
2520
11th to 20thDay
15%5%26%6%35%5%6%9%38%
2520
21st to endDay
19%5%46%6%36%6%7%8%31%
2520
July1st to 10thDay
12%5%35%5%35%6%7%8%40%
2520
11th to 20thDay
12%5%36%5%45%5%6%9%40%
2520
21st to endDay
12%5%25%6%46%6%6%10%39%
2744
August1st to 10thDay
11%5%26%6%45%7%7%7%40%
2465
11th to 20thDay
12%5%36%6%36%5%6%8%40%
2285
21st to endDay
13%6%35%6%35%5%6%9%40%
2376
September1st to 10thDay
14%5%25%5%35%6%5%8%43%
2160
11th to 20thDay
13%5%245%345%5%8%45%
2160
21st to endDay
17%5%35%6%3446%8%38%
1919
October1st to 10thDay
21%7%35%5%3446%7%35%
1800
11th to 20thDay
24%8%37%6%45%5%5%7%28%
1800
21st to endDay
27%8%37%5%35%5%45%28%
1841
November1st to 10thDay
16%8%37%5%46%5%6%6%34%
1667
11th to 20thDay
21%11%46%6%45%5%6%6%27%
1520
21st to endDay
22%13%49%7%5%5%5%46%20%
1520
December1st to 10thDay
22%17%7%9%6%45%45%6%16%
1520
11th to 20thDay
21%13%5%9%7%35%5%5%5%24%
1906
21st to endDay
28%17%7%8%6%3333319%
2772
January1st to 10thNight
18%17%7%11%7%45%445%18%
2649
11th to 20thNight
18%17%6%9%7%45%44423%
2541
21st to endNight
13%14%6%8%7%345%46%30%
2696
February1st to 10thNight
15%13%5%11%8%45%45%6%22%
2340
11th to 20thNight
15%12%6%10%7%3445%6%29%
2273
21st to endNight
17%11%5%8%7%45%445%30%
1778
March1st to 10thNight
16%13%48%7%45%445%29%
2143
11th to 20thNight
16%12%5%8%6%34445%33%
1979
21st to endNight
18%8%36%6%2435%5%39%
2066
April1st to 10thNight
21%9%46%5%4445%5%33%
1800
11th to 20thNight
19%8%46%7%25%5%46%36%
1775
21st to endNight
21%9%36%6%35%35%5%33%
1684
May1st to 10thNight
20%7%35%5%445%5%7%36%
1440
11th to 20thNight
17%8%345%34447%39%
1415
21st to endNight
13%5%35%5%345%6%6%44%
1550
June1st to 10thNight
16%6%36%6%36%5%6%9%35%
1440
11th to 20thNight
15%5%26%5%3446%8%43%
1440
21st to endNight
17%7%25%435%5%6%8%37%
1440
July1st to 10thNight
11%425%5%36%5%5%8%46%
1440
11th to 20thNight
12%6%35%4346%6%9%43%
1440
21st to endNight
10%5%246%36%6%6%8%44%
1574
August1st to 10thNight
10%6%27%4445%6%10%42%
1471
11th to 20thNight
10%5%35%5%45%5%6%8%45%
1598
21st to endNight
11%5%25%6%35%5%6%7%45%
1980
September1st to 10thNight
11%5%35%5%4445%7%46%
1800
11th to 20thNight
15%425%44335%6%49%
1800
21st to endNight
18%6%25%6%3435%6%44%
2036
October1st to 10thNight
19%8%35%5%345%5%6%38%
2160
11th to 20thNight
22%8%35%7%46%45%6%30%
2160
21st to endNight
24%10%36%6%45%45%6%28%
2515
November1st to 10thNight
20%9%36%6%3445%6%34%
2407
11th to 20thNight
20%10%47%6%45%5%5%5%29%
2660
21st to endNight
22%12%5%8%7%4445%7%23%
2660
December1st to 10thNight
22%15%6%9%7%35%5%6%5%17%
2660
11th to 20thNight
23%13%48%7%3443426%
3288
21st to endNight
30%18%48%5%2433418%
4884

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
66%410%14%6%
1518
11th to 20thDay
65%48%12%10%1
1448
21st to endDay
60%5%10%15%9%1
1656
February1st to 10thDay
63%410%17%42
1620
11th to 20thDay
57%412%17%9%1
1582
21st to endDay
60%411%14%10%1
1476
March1st to 10thDay
57%410%18%10%1
1804
11th to 20thDay
55%412%16%11%3
1980
21st to endDay
50%48%19%14%5%
2290
April1st to 10thDay
54%38%21%12%3
2160
11th to 20thDay
50%37%23%15%2
2134
21st to endDay
55%48%15%14%4
2291
May1st to 10thDay
50%5%7%21%14%4
2520
11th to 20thDay
46%5%8%22%17%3
2482
21st to endDay
46%5%13%21%13%3
2725
June1st to 10thDay
53%5%11%19%11%1
2520
11th to 20thDay
41%6%13%24%13%3
2520
21st to endDay
49%6%14%21%11%1
2520
July1st to 10thDay
38%6%14%27%14%1
2450
11th to 20thDay
39%6%16%27%12%
2445
21st to endDay
40%6%17%27%10%
2591
August1st to 10thDay
39%7%17%26%10%
2451
11th to 20thDay
41%6%16%28%9%1
2285
21st to endDay
40%5%15%28%12%1
2376
September1st to 10thDay
39%6%15%28%12%
2160
11th to 20thDay
37%5%14%32%12%1
2160
21st to endDay
43%7%14%27%9%
1919
October1st to 10thDay
48%5%13%23%10%1
1800
11th to 20thDay
55%6%16%17%6%1
1800
21st to endDay
59%413%16%8%1
1841
November1st to 10thDay
48%5%16%23%7%1
1667
11th to 20thDay
57%5%14%15%8%1
1520
21st to endDay
65%6%12%9%7%1
1520
December1st to 10thDay
69%5%12%11%31
1520
11th to 20thDay
62%5%14%14%5%
1906
21st to endDay
72%37%15%3
2772
January1st to 10thNight
69%49%13%5%
2649
11th to 20thNight
66%49%12%8%1
2541
21st to endNight
56%49%19%11%1
2696
February1st to 10thNight
63%410%15%7%1
2340
11th to 20thNight
57%411%20%8%1
2275
21st to endNight
56%5%9%19%11%1
1778
March1st to 10thNight
58%310%18%10%2
2153
11th to 20thNight
54%310%19%12%2
1980
21st to endNight
48%48%20%15%5%
2066
April1st to 10thNight
53%49%18%15%2
1800
11th to 20thNight
50%47%21%16%1
1775
21st to endNight
54%47%16%16%4
1684
May1st to 10thNight
47%5%6%21%16%5%
1440
11th to 20thNight
44%48%23%18%3
1416
21st to endNight
39%5%16%20%18%3
1551
June1st to 10thNight
45%6%14%24%9%1
1440
11th to 20thNight
39%5%12%26%16%2
1440
21st to endNight
44%7%13%22%14%1
1440
July1st to 10thNight
35%6%13%27%17%2
1400
11th to 20thNight
38%5%12%32%13%
1392
21st to endNight
35%6%16%28%14%
1486
August1st to 10thNight
38%7%17%24%13%1
1461
11th to 20thNight
36%5%17%30%12%
1598
21st to endNight
37%6%16%30%11%
1980
September1st to 10thNight
37%6%11%30%15%1
1800
11th to 20thNight
36%414%34%10%2
1800
21st to endNight
42%411%32%10%
2036
October1st to 10thNight
47%6%10%24%13%1
2160
11th to 20thNight
54%5%11%21%8%
2160
21st to endNight
57%5%14%16%8%
2515
November1st to 10thNight
51%414%21%9%
2407
11th to 20thNight
56%411%18%9%1
2660
21st to endNight
61%6%13%15%5%
2660
December1st to 10thNight
68%5%10%13%3
2660
11th to 20thNight
62%410%17%7%1
3288
21st to endNight
73%37%13%4
4884

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
24%22%33%17%5%
180
11th to 20thDay
28%20%34%14%4
162
21st to endDay
21%17%38%19%4
208
February1st to 10thDay
31%27%31%10%1
240
11th to 20thDay
28%29%36%7%1
240
21st to endDay
30%25%29%15%2
342
March1st to 10thDay
28%18%33%18%4
420
11th to 20thDay
26%21%34%15%41
420
21st to endDay
31%19%27%16%6%1
462
April1st to 10thDay
30%20%28%15%6%1
420
11th to 20thDay
30%18%25%14%11%2
412
21st to endDay
30%20%30%13%7%1
420
May1st to 10thDay
26%15%30%19%7%3
423
11th to 20thDay
18%19%31%20%8%3
447
21st to endDay
18%15%32%22%11%1
485
June1st to 10thDay
26%12%30%22%7%2
450
11th to 20thDay
16%16%30%25%11%3
450
21st to endDay
19%14%31%22%12%3
450
July1st to 10thDay
12%7%26%35%16%4
445
11th to 20thDay
14%7%32%27%15%5%
444
21st to endDay
13%8%30%30%14%4
488
August1st to 10thDay
13%7%29%30%18%4
446
11th to 20thDay
12%7%26%29%18%9%
439
21st to endDay
15%12%27%24%14%8%
495
September1st to 10thDay
16%10%29%21%16%9%
450
11th to 20thDay
13%9%27%23%19%9%
450
21st to endDay
18%12%31%20%15%5%
450
October1st to 10thDay
24%14%25%19%13%4
450
11th to 20thDay
26%20%28%19%7%1
450
21st to endDay
31%17%25%21%6%
426
November1st to 10thDay
24%18%29%19%9%1
361
11th to 20thDay
29%22%33%11%41
180
21st to endDay
28%19%36%11%41
180
December1st to 10thDay
31%16%38%13%3
180
11th to 20thDay
29%27%32%9%2
180
21st to endDay
28%23%34%12%21
198
January1st to 10thNight
28%14%34%20%4
760
11th to 20thNight
27%18%26%21%6%1
727
21st to endNight
19%12%37%26%5%
792
February1st to 10thNight
23%17%35%22%4
720
11th to 20thNight
22%17%38%19%4
703
21st to endNight
25%18%28%26%4
592
March1st to 10thNight
23%15%35%23%3
720
11th to 20thNight
24%17%31%21%6%
720
21st to endNight
24%15%28%26%7%
792
April1st to 10thNight
27%13%30%25%5%
720
11th to 20thNight
25%17%28%22%8%
711
21st to endNight
26%13%28%25%8%
604
May1st to 10thNight
24%7%28%31%9%2
360
11th to 20thNight
23%9%28%31%9%
354
21st to endNight
15%6%36%30%12%
389
June1st to 10thNight
19%432%34%11%
360
11th to 20thNight
17%8%24%35%14%2
360
21st to endNight
22%5%26%32%15%1
360
July1st to 10thNight
10%428%39%19%
350
11th to 20thNight
12%424%43%16%1
348
21st to endNight
9%5%23%45%15%1
394
August1st to 10thNight
12%321%41%22%1
397
11th to 20thNight
12%418%39%24%3
534
21st to endNight
13%6%24%35%18%2
792
September1st to 10thNight
14%5%29%30%20%2
720
11th to 20thNight
17%7%21%32%20%3
720
21st to endNight
21%8%23%26%20%2
720
October1st to 10thNight
23%10%25%26%15%1
720
11th to 20thNight
27%13%28%24%8%1
720
21st to endNight
27%14%27%26%6%
792
November1st to 10thNight
26%13%26%26%8%1
740
11th to 20thNight
24%16%32%18%9%1
760
21st to endNight
30%15%27%22%6%
760
December1st to 10thNight
30%15%29%22%3
760
11th to 20thNight
28%16%29%21%5%1
760
21st to endNight
34%16%29%17%4
836
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