Pullout on Antelope Flats Rd
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pullout on Antelope Flats Rd clear sky chart from 2005-11-06 to 2024-03-06.

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
52%
24388
16%
79861
14%
24320
55%
24320
23%
52607

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
40%
913
9%
4338
8%
907
42%
907
9%
3152
January11th to 20thNight
40%
752
11%
4092
12%
740
44%
740
9%
3104
January21st to endNight
41%
825
8%
4478
11%
814
44%
814
8%
3332
February1st to 10thNight
34%
760
8%
2470
8%
760
36%
760
11%
1923
February11th to 20thNight
36%
740
10%
2403
10%
740
38%
740
14%
1803
February21st to endNight
33%
628
11%
1951
10%
628
35%
628
13%
1510
March1st to 10thNight
42%
742
11%
2071
10%
742
44%
742
18%
1559
March11th to 20thNight
50%
720
16%
1980
12%
720
53%
720
25%
1365
March21st to endNight
42%
792
10%
2178
7%
792
44%
792
18%
1657
April1st to 10thNight
44%
622
12%
1882
9%
622
47%
622
18%
1345
April11th to 20thNight
43%
533
14%
1655
11%
533
46%
533
20%
1138
April21st to endNight
51%
540
17%
1620
14%
540
54%
540
25%
1067
May1st to 10thNight
55%
540
13%
1620
12%
540
56%
540
27%
1023
May11th to 20thNight
60%
531
14%
1512
13%
531
61%
531
30%
948
May21st to endNight
54%
583
10%
1552
8%
582
55%
582
21%
1124
June1st to 10thNight
57%
540
13%
1440
9%
540
59%
540
30%
943
June11th to 20thNight
57%
381
20%
1281
18%
381
63%
381
33%
698
June21st to endNight
81%
360
28%
1260
33%
360
84%
360
53%
527
July1st to 10thNight
84%
350
24%
1225
29%
350
87%
350
54%
518
July11th to 20thNight
79%
488
30%
1427
30%
488
83%
488
66%
626
July21st to endNight
80%
591
27%
1674
25%
558
83%
558
56%
778
August1st to 10thNight
76%
537
26%
1602
23%
534
77%
534
43%
852
August11th to 20thNight
83%
534
35%
1602
29%
534
84%
534
58%
736
August21st to endNight
75%
594
34%
1813
30%
594
78%
594
50%
883
September1st to 10thNight
75%
540
32%
1800
33%
540
79%
540
48%
856
September11th to 20thNight
72%
720
29%
1980
25%
720
75%
720
45%
1114
September21st to endNight
70%
720
29%
1980
24%
720
72%
720
46%
1100
October1st to 10thNight
58%
720
19%
2132
16%
720
61%
720
30%
1342
October11th to 20thNight
58%
720
23%
2160
19%
720
62%
720
33%
1286
October21st to endNight
59%
792
21%
2389
17%
792
63%
792
31%
1457
November1st to 10thNight
46%
754
16%
2419
15%
754
48%
754
22%
1616
November11th to 20thNight
43%
950
15%
2660
10%
950
46%
950
24%
1839
November21st to endNight
48%
950
14%
2660
11%
950
50%
950
25%
1802
December1st to 10thNight
38%
950
9%
2660
6%
950
40%
950
16%
2044
December11th to 20thNight
37%
948
11%
3162
7%
948
38%
948
12%
2419
December21st to endNight
34%
1028
6%
4733
6%
1026
37%
1026
9%
3121

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
49%5%9%7%45%5%5%7%40%
79168
Night
39%5%9%7%45%5%5%7%40%
80405
TransparencyDay
44%7%13%18%13%5%
78876
Night
43%7%14%20%12%4
80219
SeeingDay
9%14%29%29%16%4
14680
Night
8%6%23%40%20%2
24449

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
110%9%18%13%5%5%5%5%6%23%
2600
11th to 20thDay
111%7%15%11%5%6%5%5%6%28%
2860
21st to endDay
112%10%13%10%46%5%5%6%27%
3146
February1st to 10thDay
216%8%16%9%46%5%5%5%24%
1710
11th to 20thDay
214%10%14%10%45%5%45%27%
1665
21st to endDay
213%9%18%11%5%5%45%5%22%
1501
March1st to 10thDay
112%6%15%11%46%5%5%6%29%
2004
11th to 20thDay
212%6%10%8%45%5%6%9%31%
1980
21st to endDay
418%8%13%9%46%5%5%7%22%
2178
April1st to 10thDay
7%16%5%11%8%46%5%47%27%
2078
11th to 20thDay
5%15%6%11%9%47%45%7%27%
2249
21st to endDay
7%15%6%9%7%45%5%5%8%30%
2340
May1st to 10thDay
7%11%5%8%7%46%6%6%7%32%
2340
11th to 20thDay
8%8%37%6%5%8%6%7%10%33%
2382
21st to endDay
11%11%5%9%8%6%6%6%6%8%24%
2724
June1st to 10thDay
8%7%37%6%36%6%7%8%39%
2520
11th to 20thDay
9%7%26%6%35%5%6%9%43%
2672
21st to endDay
2213425%45%8%63%
2700
July1st to 10thDay
2212335%5%6%9%61%
2700
11th to 20thDay
2213335%5%5%7%62%
2480
21st to endDay
43234345%6%8%57%
2545
August1st to 10thDay
5%324435%6%7%7%54%
2328
11th to 20thDay
2223435%5%6%6%63%
2299
21st to endDay
5%2134245%6%7%59%
2543
September1st to 10thDay
5%3235%345%46%60%
2157
11th to 20thDay
6%425%5%345%48%55%
1980
21st to endDay
6%6%24433447%58%
1980
October1st to 10thDay
9%10%36%6%4445%5%43%
1827
11th to 20thDay
6%10%45%5%34446%49%
1800
21st to endDay
410%37%7%35%5%5%7%44%
1962
November1st to 10thDay
6%13%5%8%5%35%5%5%7%37%
1638
11th to 20thDay
313%5%12%7%34446%37%
1520
21st to endDay
110%7%13%7%35%5%5%6%39%
1520
December1st to 10thDay
213%6%14%10%5%6%5%5%7%29%
1520
11th to 20thDay
314%6%14%10%46%6%5%9%23%
1926
21st to endDay
210%5%14%9%45%6%7%9%30%
2794
January1st to 10thNight
17%8%19%11%5%6%5%6%8%24%
4385
11th to 20thNight
19%7%19%15%6%5%445%25%
4110
21st to endNight
117%8%15%10%45%46%5%25%
4521
February1st to 10thNight
212%8%16%9%5%7%6%5%6%25%
2470
11th to 20thNight
212%9%13%10%45%5%45%30%
2402
21st to endNight
210%8%17%12%5%6%5%46%24%
1951
March1st to 10thNight
211%7%13%8%5%6%5%6%7%31%
2071
11th to 20thNight
210%49%6%46%6%6%8%40%
1980
21st to endNight
413%8%11%7%36%6%7%7%29%
2178
April1st to 10thNight
314%5%8%7%46%5%6%9%33%
1882
11th to 20thNight
5%9%5%9%7%45%5%6%8%36%
1655
21st to endNight
411%37%5%45%5%5%8%43%
1620
May1st to 10thNight
7%8%36%5%35%5%6%8%43%
1620
11th to 20thNight
7%6%24435%6%7%11%45%
1511
21st to endNight
9%9%45%7%47%6%7%10%33%
1552
June1st to 10thNight
9%5%25%5%45%5%7%9%46%
1440
11th to 20thNight
9%5%1442346%10%52%
1281
21st to endNight
311222345%7%70%
1260
July1st to 10thNight
12123245%7%10%65%
1260
11th to 20thNight
1122225%5%8%72%
1473
21st to endNight
131232345%8%66%
1773
August1st to 10thNight
3315%4345%6%8%58%
1611
11th to 20thNight
221222245%7%70%
1602
21st to endNight
42123245%5%6%65%
1813
September1st to 10thNight
4313324447%66%
1800
11th to 20thNight
4324435%5%5%7%59%
1980
21st to endNight
8%5%23323336%63%
1980
October1st to 10thNight
8%8%36%6%25%346%48%
2132
11th to 20thNight
7%8%3442435%6%53%
2160
21st to endNight
49%36%5%335%5%8%49%
2389
November1st to 10thNight
6%12%48%6%445%6%7%39%
2419
11th to 20thNight
311%5%8%7%46%5%6%7%37%
2660
21st to endNight
39%6%10%6%46%5%5%8%40%
2660
December1st to 10thNight
114%6%12%9%5%7%6%5%6%30%
2660
11th to 20thNight
212%6%14%10%5%6%5%6%9%25%
3271
21st to endNight
212%6%12%10%46%6%6%9%28%
4873

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
59%9%14%15%31
2601
11th to 20thDay
54%8%15%10%9%3
2860
21st to endDay
56%10%13%13%7%1
3146
February1st to 10thDay
62%8%13%12%41
1710
11th to 20thDay
60%6%13%13%5%2
1674
21st to endDay
65%5%8%14%5%2
1501
March1st to 10thDay
57%7%14%15%5%1
2004
11th to 20thDay
50%9%17%15%8%2
1980
21st to endDay
65%6%13%13%3
2178
April1st to 10thDay
60%7%12%15%6%1
2078
11th to 20thDay
57%6%14%17%6%
2252
21st to endDay
53%8%14%20%4
2340
May1st to 10thDay
50%8%13%22%6%
2340
11th to 20thDay
44%9%19%22%6%
2386
21st to endDay
56%10%15%14%4
2724
June1st to 10thDay
41%8%18%22%10%1
2520
11th to 20thDay
39%7%12%20%17%7%
2672
21st to endDay
20%411%26%30%10%
2700
July1st to 10thDay
20%5%10%25%29%12%
2626
11th to 20thDay
22%49%18%25%23%
2403
21st to endDay
25%5%10%17%25%19%
2404
August1st to 10thDay
28%6%11%19%25%11%
2313
11th to 20thDay
21%5%10%24%29%12%
2299
21st to endDay
24%49%21%31%11%
2543
September1st to 10thDay
26%5%8%17%33%12%
2157
11th to 20thDay
30%411%23%24%8%
1980
21st to endDay
29%412%29%22%4
1980
October1st to 10thDay
44%5%12%23%13%3
1827
11th to 20thDay
39%6%16%28%9%2
1800
21st to endDay
41%7%19%22%11%1
1962
November1st to 10thDay
49%6%15%21%8%2
1638
11th to 20thDay
48%7%17%19%8%1
1520
21st to endDay
47%7%18%18%10%1
1520
December1st to 10thDay
56%10%11%11%9%3
1520
11th to 20thDay
56%10%15%15%4
1924
21st to endDay
49%8%12%14%9%8%
2794
January1st to 10thNight
53%11%16%14%5%
4385
11th to 20thNight
60%9%13%11%5%2
4110
21st to endNight
58%9%14%12%6%1
4521
February1st to 10thNight
60%8%13%13%6%
2470
11th to 20thNight
58%6%12%16%7%1
2403
21st to endNight
62%5%11%14%6%2
1951
March1st to 10thNight
54%8%15%17%6%1
2071
11th to 20thNight
42%9%17%22%8%2
1980
21st to endNight
55%7%16%18%31
2178
April1st to 10thNight
50%8%17%16%9%1
1882
11th to 20thNight
47%7%17%22%6%1
1655
21st to endNight
41%8%18%28%5%
1620
May1st to 10thNight
38%7%17%29%8%
1620
11th to 20thNight
32%11%22%25%9%
1512
21st to endNight
45%11%19%19%6%
1552
June1st to 10thNight
36%10%18%26%10%1
1440
11th to 20thNight
30%6%15%24%19%7%
1281
21st to endNight
14%5%10%28%32%11%
1260
July1st to 10thNight
14%6%13%25%32%11%
1225
11th to 20thNight
11%38%23%31%24%
1427
21st to endNight
16%49%20%31%20%
1674
August1st to 10thNight
24%6%10%21%24%14%
1602
11th to 20thNight
14%49%29%30%14%
1602
21st to endNight
19%5%9%21%33%13%
1813
September1st to 10thNight
19%5%9%19%34%14%
1800
11th to 20thNight
24%7%11%24%26%8%
1980
21st to endNight
26%410%30%25%4
1980
October1st to 10thNight
38%5%14%25%15%2
2132
11th to 20thNight
34%5%15%33%11%2
2160
21st to endNight
35%7%18%28%12%1
2389
November1st to 10thNight
46%6%15%22%9%2
2419
11th to 20thNight
45%7%19%20%7%1
2660
21st to endNight
43%7%18%20%10%2
2660
December1st to 10thNight
55%9%15%12%7%2
2660
11th to 20thNight
56%8%16%15%5%
3272
21st to endNight
50%7%12%17%9%5%
4873

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
7%16%17%39%18%3
270
11th to 20thDay
413%26%40%11%6%
270
21st to endDay
6%10%30%35%16%2
297
February1st to 10thDay
14%25%29%28%4
270
11th to 20thDay
10%18%33%29%10%1
270
21st to endDay
10%23%35%23%9%1
313
March1st to 10thDay
12%25%34%24%41
441
11th to 20thDay
9%20%34%25%11%1
420
21st to endDay
13%22%34%24%6%1
462
April1st to 10thDay
15%23%32%20%8%1
420
11th to 20thDay
13%27%34%17%8%1
412
21st to endDay
20%15%28%20%14%3
420
May1st to 10thDay
11%19%32%26%10%2
423
11th to 20thDay
15%12%27%26%17%2
529
21st to endDay
15%11%23%28%18%5%
679
June1st to 10thDay
10%14%22%29%21%5%
630
11th to 20thDay
15%14%30%28%12%2
630
21st to endDay
5%8%27%33%22%4
630
July1st to 10thDay
26%24%38%26%4
621
11th to 20thDay
39%31%32%22%2
546
21st to endDay
5%6%27%37%19%6%
487
August1st to 10thDay
8%6%29%31%21%5%
447
11th to 20thDay
36%28%30%21%11%
437
21st to endDay
6%10%28%30%18%8%
495
September1st to 10thDay
5%10%32%24%21%7%
450
11th to 20thDay
10%13%27%25%17%8%
450
21st to endDay
8%12%28%28%18%6%
450
October1st to 10thDay
13%7%25%27%21%8%
297
11th to 20thDay
10%14%22%27%19%9%
270
21st to endDay
11%14%31%31%11%2
297
November1st to 10thDay
10%17%31%27%9%6%
270
11th to 20thDay
9%13%30%29%17%3
270
21st to endDay
49%33%36%16%3
270
December1st to 10thDay
8%12%28%33%16%2
270
11th to 20thDay
9%16%28%32%14%
270
21st to endDay
10%17%29%27%13%5%
297
January1st to 10thNight
6%9%28%39%16%1
931
11th to 20thNight
7%6%32%40%12%2
760
21st to endNight
7%5%31%43%12%2
836
February1st to 10thNight
8%9%34%39%9%1
760
11th to 20thNight
7%9%32%37%13%1
744
21st to endNight
7%11%32%36%12%2
628
March1st to 10thNight
6%10%31%40%12%1
742
11th to 20thNight
6%7%26%42%17%1
720
21st to endNight
10%6%28%39%16%
792
April1st to 10thNight
10%11%26%37%14%2
622
11th to 20thNight
12%8%28%38%13%
533
21st to endNight
11%5%24%37%21%2
540
May1st to 10thNight
12%7%19%39%21%1
540
11th to 20thNight
12%5%17%37%26%3
531
21st to endNight
15%418%37%24%2
584
June1st to 10thNight
14%5%19%32%28%2
540
11th to 20thNight
10%5%22%45%18%
381
21st to endNight
3110%48%34%3
360
July1st to 10thNight
119%46%40%3
350
11th to 20thNight
3214%45%35%1
488
21st to endNight
219%48%37%3
591
August1st to 10thNight
5%18%47%36%3
537
11th to 20thNight
318%45%40%3
534
21st to endNight
5%214%38%37%4
594
September1st to 10thNight
6%214%41%34%3
540
11th to 20thNight
5%212%41%34%6%
720
21st to endNight
11%313%41%27%6%
720
October1st to 10thNight
10%5%19%38%23%4
720
11th to 20thNight
11%6%18%40%22%3
720
21st to endNight
8%6%20%49%14%3
792
November1st to 10thNight
10%8%27%37%16%2
754
11th to 20thNight
11%9%29%41%9%1
950
21st to endNight
8%8%28%40%14%2
950
December1st to 10thNight
9%9%31%40%10%1
950
11th to 20thNight
10%9%29%41%11%1
950
21st to endNight
9%12%29%36%11%2
1045
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