Hastings
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hastings 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%
24838
23%
79649
13%
24736
50%
24736
31%
46246

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
33%
939
20%
4362
10%
926
45%
926
18%
2675
January11th to 20thNight
32%
948
26%
4008
10%
930
42%
930
21%
2196
January21st to endNight
31%
1037
17%
4374
9%
1023
42%
1023
19%
2821
February1st to 10thNight
28%
950
18%
2470
6%
950
36%
950
26%
1680
February11th to 20thNight
32%
765
21%
2239
9%
761
41%
761
30%
1354
February21st to endNight
27%
628
25%
1884
6%
628
43%
628
33%
1067
March1st to 10thNight
28%
696
24%
2196
9%
696
42%
696
31%
1256
March11th to 20thNight
30%
540
24%
1980
15%
540
44%
540
27%
1122
March21st to endNight
23%
594
16%
2178
9%
594
35%
594
20%
1378
April1st to 10thNight
26%
540
18%
1908
9%
540
40%
540
25%
1101
April11th to 20thNight
27%
533
20%
1655
12%
533
39%
533
27%
1005
April21st to endNight
36%
540
23%
1620
17%
540
48%
540
31%
967
May1st to 10thNight
35%
540
17%
1620
11%
540
43%
540
24%
1055
May11th to 20thNight
37%
531
16%
1593
10%
531
44%
531
28%
1007
May21st to endNight
41%
583
14%
1746
7%
582
47%
582
27%
1128
June1st to 10thNight
59%
540
19%
1620
13%
540
63%
540
40%
884
June11th to 20thNight
46%
540
21%
1440
9%
540
51%
540
41%
848
June21st to endNight
52%
540
23%
1440
11%
540
58%
540
48%
796
July1st to 10thNight
65%
525
18%
1400
10%
525
67%
525
41%
827
July11th to 20thNight
69%
522
22%
1487
17%
522
72%
522
47%
795
July21st to endNight
71%
591
22%
1673
20%
558
74%
558
45%
872
August1st to 10thNight
69%
537
19%
1601
20%
534
70%
534
37%
927
August11th to 20thNight
62%
534
27%
1600
27%
534
69%
534
43%
851
August21st to endNight
63%
594
28%
1843
28%
594
70%
594
44%
957
September1st to 10thNight
57%
540
27%
1926
26%
540
66%
540
43%
904
September11th to 20thNight
50%
540
30%
1980
25%
540
64%
540
37%
997
September21st to endNight
46%
540
31%
1980
21%
540
60%
540
38%
963
October1st to 10thNight
41%
556
29%
1996
23%
556
50%
556
30%
1089
October11th to 20thNight
36%
720
29%
2160
14%
720
46%
720
38%
1166
October21st to endNight
39%
890
28%
2474
13%
890
48%
890
37%
1415
November1st to 10thNight
43%
925
32%
2405
13%
925
55%
925
49%
1291
November11th to 20thNight
36%
950
33%
2470
11%
950
50%
950
41%
1415
November21st to endNight
40%
950
28%
2470
13%
950
49%
950
40%
1434
December1st to 10thNight
32%
950
26%
2470
9%
950
44%
950
37%
1484
December11th to 20thNight
33%
949
29%
2852
10%
948
44%
948
32%
1596
December21st to endNight
30%
1041
17%
4529
9%
1026
43%
1026
18%
2923

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%6%35%5%3445%7%49%
79129
Night
9%6%35%42445%7%51%
80450
TransparencyDay
34%6%14%26%17%3
78847
Night
32%6%13%27%19%3
80255
SeeingDay
13%8%31%31%15%3
14744
Night
11%9%35%34%10%1
24865

By Month

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 10thDay
6%14%5%7%6%45%5%5%6%39%
2538
11th to 20thDay
6%12%5%8%6%345%5%7%40%
2828
21st to endDay
7%8%5%12%6%33436%44%
3135
February1st to 10thDay
9%9%48%6%35%45%6%39%
1710
11th to 20thDay
6%7%37%5%4445%8%48%
1844
21st to endDay
9%6%26%5%24447%51%
1570
March1st to 10thDay
8%6%35%43445%6%53%
1924
11th to 20thDay
15%9%35%31336%7%44%
1980
21st to endDay
14%10%47%5%3445%7%38%
2178
April1st to 10thDay
11%6%35%425%45%6%48%
2047
11th to 20thDay
14%7%35%6%3346%7%43%
2252
21st to endDay
18%7%245%235%5%8%42%
2340
May1st to 10thDay
14%6%35%5%345%6%7%42%
2340
11th to 20thDay
16%6%35%5%3446%7%43%
2302
21st to endDay
14%6%35%6%35%5%6%8%39%
2531
June1st to 10thDay
6%3244345%6%9%55%
2340
11th to 20thDay
8%3245%345%6%8%52%
2515
21st to endDay
6%31443447%9%53%
2520
July1st to 10thDay
7%42344446%9%53%
2520
11th to 20thDay
42144345%6%9%57%
2421
21st to endDay
6%4244345%7%9%50%
2546
August1st to 10thDay
7%5%26%5%45%5%7%10%44%
2328
11th to 20thDay
6%3244335%6%8%56%
2301
21st to endDay
8%4245%3345%7%55%
2511
September1st to 10thDay
12%5%24434335%55%
2032
11th to 20thDay
9%4245%23447%57%
1980
21st to endDay
9%413323347%60%
1980
October1st to 10thDay
15%5%24323345%54%
1944
11th to 20thDay
10%5%23313435%60%
1800
21st to endDay
12%7%25%322245%55%
1880
November1st to 10thDay
8%41433435%7%58%
1673
11th to 20thDay
6%7%34433445%57%
1710
21st to endDay
10%8%35%423346%52%
1710
December1st to 10thDay
6%6%36%5%3445%7%51%
1710
11th to 20thDay
7%7%46%6%34346%49%
2161
21st to endDay
12%10%411%5%3445%5%36%
3028
January1st to 10thNight
6%11%410%7%3445%7%40%
4416
11th to 20thNight
6%9%36%5%35%446%50%
4120
21st to endNight
8%10%49%6%335%45%43%
4532
February1st to 10thNight
8%10%46%5%35%5%5%6%43%
2470
11th to 20thNight
6%6%36%6%345%6%7%47%
2239
21st to endNight
6%7%26%434446%54%
1884
March1st to 10thNight
10%6%34433346%54%
2196
11th to 20thNight
13%7%35%423447%51%
1980
21st to endNight
13%8%46%5%25%46%7%40%
2178
April1st to 10thNight
10%6%35%43446%6%48%
1908
11th to 20thNight
13%6%245%35%5%5%9%45%
1655
21st to endNight
11%5%35%3234410%49%
1620
May1st to 10thNight
15%6%34426%5%5%7%43%
1620
11th to 20thNight
14%6%25%43445%8%45%
1593
21st to endNight
13%5%25%445%46%10%41%
1745
June1st to 10thNight
5%3243245%7%10%56%
1620
11th to 20thNight
7%423325%5%6%8%56%
1440
21st to endNight
431442445%10%59%
1440
July1st to 10thNight
6%3244345%7%10%51%
1440
11th to 20thNight
32224345%7%9%59%
1536
21st to endNight
42244245%7%11%54%
1772
August1st to 10thNight
6%3245%35%6%7%10%50%
1611
11th to 20thNight
6%4235%2446%9%57%
1600
21st to endNight
6%414324446%62%
1843
September1st to 10thNight
9%312223247%63%
1926
11th to 20thNight
7%42342445%6%59%
1980
21st to endNight
7%32342435%6%61%
1980
October1st to 10thNight
14%423424346%54%
1996
11th to 20thNight
11%423323345%60%
2160
21st to endNight
12%5%23323346%58%
2474
November1st to 10thNight
432432335%7%64%
2405
11th to 20thNight
8%5%2342435%6%58%
2470
21st to endNight
9%6%2332335%7%57%
2470
December1st to 10thNight
6%7%246%24447%55%
2470
11th to 20thNight
7%5%25%42435%8%54%
3036
21st to endNight
16%11%37%5%23446%40%
4625

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
44%7%16%22%10%1
2539
11th to 20thDay
43%7%16%19%13%2
2828
21st to endDay
42%6%14%24%13%1
3135
February1st to 10thDay
43%6%16%22%10%3
1710
11th to 20thDay
35%6%16%24%16%4
1854
21st to endDay
33%6%12%27%16%6%
1570
March1st to 10thDay
31%6%15%26%19%4
1924
11th to 20thDay
39%6%12%25%15%3
1980
21st to endDay
47%6%15%22%9%1
2178
April1st to 10thDay
35%6%15%26%16%2
2047
11th to 20thDay
40%5%14%23%14%3
2255
21st to endDay
41%7%13%25%14%1
2340
May1st to 10thDay
41%7%14%22%14%2
2340
11th to 20thDay
40%7%17%23%12%
2306
21st to endDay
40%11%16%21%10%2
2531
June1st to 10thDay
25%8%18%33%15%2
2340
11th to 20thDay
29%8%14%29%17%3
2515
21st to endDay
25%8%16%29%18%4
2520
July1st to 10thDay
28%6%14%30%20%2
2451
11th to 20thDay
23%8%14%30%22%5%
2347
21st to endDay
27%8%17%29%18%1
2405
August1st to 10thDay
31%10%19%25%13%1
2314
11th to 20thDay
25%8%15%33%18%1
2301
21st to endDay
28%7%12%23%24%6%
2511
September1st to 10thDay
32%5%11%24%21%7%
2032
11th to 20thDay
28%5%11%30%23%3
1980
21st to endDay
25%410%33%26%1
1980
October1st to 10thDay
34%410%25%25%2
1944
11th to 20thDay
27%49%30%23%8%
1800
21st to endDay
34%411%24%23%5%
1880
November1st to 10thDay
26%5%13%31%21%4
1673
11th to 20thDay
29%411%26%25%4
1710
21st to endDay
35%5%11%26%20%4
1710
December1st to 10thDay
33%5%15%29%15%2
1710
11th to 20thDay
36%5%14%31%13%
2159
21st to endDay
49%6%10%21%12%1
3028
January1st to 10thNight
43%5%13%24%13%1
4416
11th to 20thNight
36%5%15%27%17%1
4120
21st to endNight
43%7%12%23%15%1
4532
February1st to 10thNight
42%7%13%21%14%4
2470
11th to 20thNight
34%6%14%27%16%3
2239
21st to endNight
31%413%21%23%7%
1884
March1st to 10thNight
32%5%12%27%20%4
2196
11th to 20thNight
36%411%25%21%4
1980
21st to endNight
43%7%16%22%11%2
2178
April1st to 10thNight
35%6%14%23%19%2
1908
11th to 20thNight
36%6%15%26%15%2
1655
21st to endNight
32%7%14%26%19%2
1620
May1st to 10thNight
39%9%13%24%14%1
1620
11th to 20thNight
38%6%17%24%14%1
1594
21st to endNight
38%8%19%23%11%2
1746
June1st to 10thNight
22%10%18%31%17%2
1620
11th to 20thNight
26%8%15%27%18%5%
1440
21st to endNight
21%7%17%31%20%4
1440
July1st to 10thNight
25%9%16%27%18%5%
1400
11th to 20thNight
19%9%15%29%22%5%
1487
21st to endNight
21%8%19%33%17%3
1673
August1st to 10thNight
26%10%20%28%14%3
1601
11th to 20thNight
24%6%17%32%18%3
1600
21st to endNight
23%5%13%24%26%8%
1843
September1st to 10thNight
22%411%27%25%10%
1926
11th to 20thNight
25%6%10%29%25%5%
1980
21st to endNight
24%5%10%29%29%3
1980
October1st to 10thNight
32%5%9%27%23%4
1996
11th to 20thNight
28%48%25%27%8%
2160
21st to endNight
29%411%25%23%8%
2474
November1st to 10thNight
21%5%12%30%26%7%
2405
11th to 20thNight
27%410%28%25%5%
2470
21st to endNight
28%412%28%24%4
2470
December1st to 10thNight
30%5%14%30%18%2
2470
11th to 20thNight
29%412%36%18%1
3037
21st to endNight
44%6%11%26%11%1
4625

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
13%13%40%25%7%1
270
11th to 20thDay
16%14%34%25%10%
270
21st to endDay
13%9%43%25%8%1
297
February1st to 10thDay
14%14%43%24%41
270
11th to 20thDay
11%11%41%28%7%1
270
21st to endDay
11%19%48%18%4
225
March1st to 10thDay
14%11%46%22%5%1
261
11th to 20thDay
25%8%36%20%10%1
240
21st to endDay
23%16%38%18%6%1
264
April1st to 10thDay
16%19%42%20%4
307
11th to 20thDay
18%15%37%25%4
533
21st to endDay
22%13%34%20%9%3
600
May1st to 10thDay
14%12%32%31%10%1
603
11th to 20thDay
18%10%33%24%12%3
625
21st to endDay
17%8%31%28%14%2
679
June1st to 10thDay
46%26%36%21%6%
630
11th to 20thDay
9%5%36%31%16%2
630
21st to endDay
8%6%31%35%18%2
630
July1st to 10thDay
9%317%39%27%5%
621
11th to 20thDay
5%318%44%24%5%
618
21st to endDay
8%218%40%28%5%
684
August1st to 10thDay
9%216%45%24%4
626
11th to 20thDay
6%220%42%27%2
615
21st to endDay
10%121%41%22%5%
630
September1st to 10thDay
15%424%35%16%5%
322
11th to 20thDay
7%5%27%37%17%6%
270
21st to endDay
14%8%30%31%15%3
270
October1st to 10thDay
23%7%23%29%14%4
270
11th to 20thDay
11%12%41%24%11%1
270
21st to endDay
19%14%35%22%8%1
297
November1st to 10thDay
10%15%38%25%9%3
270
11th to 20thDay
9%16%44%20%9%
270
21st to endDay
19%13%33%23%10%2
270
December1st to 10thDay
7%9%44%30%8%1
270
11th to 20thDay
16%9%39%29%7%
270
21st to endDay
18%12%45%22%3
297
January1st to 10thNight
11%11%38%32%6%1
950
11th to 20thNight
11%11%39%31%7%1
950
21st to endNight
11%9%42%31%7%
1045
February1st to 10thNight
14%11%42%28%5%
950
11th to 20thNight
9%11%43%32%41
765
21st to endNight
12%11%45%27%5%
628
March1st to 10thNight
11%13%43%29%31
696
11th to 20thNight
16%10%41%26%6%1
540
21st to endNight
17%13%41%24%5%
594
April1st to 10thNight
14%12%44%26%4
540
11th to 20thNight
16%12%42%25%5%
533
21st to endNight
14%13%33%31%7%1
540
May1st to 10thNight
18%8%36%31%7%
540
11th to 20thNight
16%7%36%33%7%1
531
21st to endNight
16%9%30%32%12%1
584
June1st to 10thNight
7%5%25%47%14%2
540
11th to 20thNight
7%5%38%37%12%
540
21st to endNight
45%36%42%13%
540
July1st to 10thNight
7%220%45%25%1
525
11th to 20thNight
3122%52%21%1
522
21st to endNight
3216%54%24%1
591
August1st to 10thNight
6%318%52%19%3
537
11th to 20thNight
7%322%50%17%1
534
21st to endNight
7%222%45%22%2
594
September1st to 10thNight
11%227%42%17%1
540
11th to 20thNight
9%333%38%15%1
540
21st to endNight
7%5%38%34%14%1
540
October1st to 10thNight
17%6%34%30%12%
556
11th to 20thNight
14%10%37%31%9%
720
21st to endNight
14%12%31%32%10%
890
November1st to 10thNight
7%10%37%39%7%
925
11th to 20thNight
11%11%40%31%7%
950
21st to endNight
11%11%35%31%12%
950
December1st to 10thNight
10%11%42%32%5%
950
11th to 20thNight
13%10%38%31%7%
950
21st to endNight
16%11%38%30%5%
1045
Page generated at 2024-03-05 06:23:58. Version ac07

Copyright © 2024 Attilla Danko.


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