Agate Fossil Beds National Monument
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Agate Fossil Beds National Monument clear sky chart from 2005-11-05 to 2018-02-13.

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%
16726
22%
48780
12%
16684
49%
16684
34%
28585

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
34%
975
21%
2716
10%
970
44%
970
32%
1654
January16th to endNight
30%
1007
25%
2879
10%
1007
44%
1007
34%
1675
February1st to 15thNight
27%
747
15%
2395
7%
747
36%
747
24%
1506
February16th to endNight
31%
632
21%
1894
7%
632
43%
632
29%
1167
March1st to 15thNight
37%
720
21%
2160
10%
720
47%
720
33%
1268
March16th to endNight
33%
637
20%
2002
11%
637
43%
637
27%
1221
April1st to 15thNight
31%
539
18%
1798
11%
539
41%
539
27%
1079
April16th to endNight
34%
540
15%
1746
10%
540
42%
540
21%
1131
May1st to 15thNight
41%
540
18%
1551
12%
540
48%
540
29%
981
May16th to endNight
39%
562
15%
1498
8%
561
43%
561
29%
998
June1st to 15thNight
43%
540
13%
1440
6%
540
47%
540
35%
900
June16th to endNight
50%
540
19%
1440
9%
540
56%
540
50%
781
July1st to 15thNight
63%
510
17%
1360
11%
510
65%
510
39%
815
July16th to endNight
65%
564
26%
1416
17%
531
68%
531
50%
758
August1st to 15thNight
61%
539
20%
1555
15%
536
66%
536
41%
860
August16th to endNight
63%
573
28%
1910
28%
573
70%
573
42%
964
September1st to 15thNight
53%
540
26%
1800
22%
540
63%
540
37%
960
September16th to endNight
54%
537
33%
1965
28%
537
66%
537
43%
909
October1st to 15thNight
42%
662
24%
2102
15%
662
49%
662
32%
1214
October16th to endNight
43%
882
31%
2418
13%
882
54%
882
42%
1363
November1st to 15thNight
41%
950
28%
2470
13%
950
49%
950
42%
1444
November16th to endNight
38%
975
30%
2623
12%
975
52%
975
43%
1484
December1st to 15thNight
27%
975
19%
2730
6%
975
38%
975
32%
1670
December16th to endNight
30%
1040
21%
2912
8%
1040
42%
1040
31%
1783

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
7%5%2442445%8%51%
49267
Night
6%5%2442445%8%51%
48947
Cloud CoverDay
7%5%2442445%8%51%
49277
Night
6%5%2442445%8%51%
48952
Cloud CoverDay
7%5%2442445%8%51%
49275
Night
6%5%2442445%8%51%
48952
TransparencyDay
30%6%14%26%17%5%
48951
Night
30%6%15%26%16%4
48780
SeeingDay
10%7%31%30%16%3
6445
Night
8%7%38%34%9%
16732

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 15thDay
36%35%5%2445%7%49%
1552
16th to endDay
5%6%15%42436%7%52%
1710
February1st to 15thDay
5%8%45%6%35%5%5%7%42%
1730
16th to endDay
39%36%435%45%7%46%
1580
March1st to 15thDay
6%6%1332446%9%51%
1790
16th to endDay
8%7%35%435%45%7%45%
2218
April1st to 15thDay
10%7%3433445%8%44%
2150
16th to endDay
14%7%35%43435%7%40%
2214
May1st to 15thDay
12%6%2342445%7%45%
2397
16th to endDay
12%6%25%5%246%6%8%38%
2616
June1st to 15thDay
8%313325%46%9%49%
2520
16th to endDay
32232445%9%62%
2520
July1st to 15thDay
5%3133245%7%8%53%
2520
16th to endDay
42123245%6%9%56%
2656
August1st to 15thDay
43134245%6%9%52%
2392
16th to endDay
4223313448%61%
2292
September1st to 15thDay
7%313422345%59%
2160
16th to endDay
6%312212247%64%
1993
October1st to 15thDay
12%5%13413336%53%
1857
16th to endDay
5%322212447%60%
1794
November1st to 15thDay
441342445%8%55%
1718
16th to endDay
432331445%7%59%
1664
December1st to 15thDay
46%3443345%8%50%
1560
16th to endDay
5%6%44425%45%8%47%
1664
January1st to 15thNight
46%35%4345%5%8%48%
2716
16th to endNight
35%25%425%5%5%7%51%
2879
February1st to 15thNight
5%7%47%5%345%5%9%42%
2392
16th to endNight
5%8%35%425%5%5%6%47%
1894
March1st to 15thNight
47%34433448%51%
2147
16th to endNight
7%6%3442446%7%46%
2002
April1st to 15thNight
8%6%25%3345%48%46%
1798
16th to endNight
13%6%36%42435%7%40%
1746
May1st to 15thNight
11%4145%235%6%8%45%
1551
16th to endNight
12%5%2443447%8%42%
1497
June1st to 15thNight
7%41442346%11%47%
1440
16th to endNight
22123245%7%9%59%
1440
July1st to 15thNight
5%414435%45%7%52%
1440
16th to endNight
211242436%8%60%
1512
August1st to 15thNight
3213425%5%6%9%53%
1563
16th to endNight
5%2133245%47%59%
1910
September1st to 15thNight
8%5%24322346%57%
1800
16th to endNight
6%312212346%63%
1965
October1st to 15thNight
12%5%14323247%51%
2102
16th to endNight
6%413324337%58%
2418
November1st to 15thNight
5%41442345%7%55%
2470
16th to endNight
35%23324449%55%
2623
December1st to 15thNight
47%345%2436%7%49%
2730
16th to endNight
47%35%42445%7%49%
2912

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
36%35%5%245%5%6%49%
1552
16th to endDay
5%6%245%2345%7%52%
1710
February1st to 15thDay
5%8%35%6%35%5%47%42%
1730
16th to endDay
39%35%4345%5%7%46%
1580
March1st to 15thDay
6%6%2432445%9%50%
1800
16th to endDay
8%6%25%435%45%7%45%
2218
April1st to 15thDay
9%7%3433445%8%44%
2150
16th to endDay
13%7%35%435%35%7%40%
2214
May1st to 15thDay
12%5%235%2445%7%45%
2397
16th to endDay
12%6%25%5%346%6%8%38%
2616
June1st to 15thDay
8%313425%5%5%9%49%
2520
16th to endDay
311232445%9%62%
2520
July1st to 15thDay
6%2133245%7%8%53%
2520
16th to endDay
42123245%6%9%56%
2656
August1st to 15thDay
43135%245%7%9%52%
2392
16th to endDay
4213413348%61%
2292
September1st to 15thDay
8%313423345%59%
2160
16th to endDay
6%312212247%64%
1993
October1st to 15thDay
12%5%13422346%53%
1857
16th to endDay
5%41222345%7%60%
1794
November1st to 15thDay
5%4143245%49%54%
1718
16th to endDay
441331445%7%58%
1664
December1st to 15thDay
46%345%3445%8%50%
1560
16th to endDay
5%6%45%435%45%7%47%
1664
January1st to 15thNight
36%25%4345%5%8%48%
2716
16th to endNight
35%24425%5%5%7%51%
2879
February1st to 15thNight
5%7%37%5%25%5%5%9%42%
2385
16th to endNight
5%8%35%425%5%5%6%47%
1894
March1st to 15thNight
47%2443445%8%51%
2160
16th to endNight
7%6%344245%5%8%46%
2002
April1st to 15thNight
8%6%25%424448%46%
1798
16th to endNight
13%6%26%5%2345%6%41%
1746
May1st to 15thNight
11%3244245%6%7%46%
1550
16th to endNight
12%5%3442447%8%42%
1497
June1st to 15thNight
7%4245%2446%11%47%
1440
16th to endNight
22122245%6%9%59%
1440
July1st to 15thNight
5%424335%45%7%52%
1440
16th to endNight
211232445%8%61%
1512
August1st to 15thNight
3213336%5%6%10%53%
1563
16th to endNight
5%2133335%47%59%
1910
September1st to 15thNight
8%424322346%57%
1800
16th to endNight
6%31321235%5%64%
1965
October1st to 15thNight
12%414412346%51%
2102
16th to endNight
6%423313346%58%
2418
November1st to 15thNight
5%324423447%55%
2470
16th to endNight
45%233235%49%55%
2623
December1st to 15thNight
47%35%42436%8%49%
2730
16th to endNight
47%35%42445%7%49%
2912

Percentage Cloud Cover SE (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
37%35%5%245%5%7%49%
1552
16th to endDay
5%6%2442445%7%51%
1710
February1st to 15thDay
5%8%446%35%5%5%6%42%
1730
16th to endDay
49%35%435%45%7%46%
1580
March1st to 15thDay
6%6%2332446%9%50%
1800
16th to endDay
8%6%345%3445%7%45%
2216
April1st to 15thDay
9%7%3442445%8%44%
2150
16th to endDay
13%7%3443435%7%40%
2214
May1st to 15thDay
13%5%135%2445%8%44%
2397
16th to endDay
12%6%25%435%5%6%8%38%
2616
June1st to 15thDay
8%3133345%6%9%49%
2520
16th to endDay
32222345%7%62%
2520
July1st to 15thDay
5%2143245%6%9%53%
2520
16th to endDay
42123345%6%9%56%
2656
August1st to 15thDay
43134245%6%9%53%
2392
16th to endDay
4213323447%61%
2292
September1st to 15thDay
8%413323445%59%
2160
16th to endDay
6%312312247%64%
1993
October1st to 15thDay
12%5%2242335%6%52%
1857
16th to endDay
5%41231236%6%60%
1794
November1st to 15thDay
441342445%9%54%
1718
16th to endDay
432431446%6%58%
1664
December1st to 15thDay
5%5%35%5%2345%8%50%
1560
16th to endDay
5%6%45%42445%7%47%
1664
January1st to 15thNight
46%25%5%345%5%9%48%
2716
16th to endNight
35%24425%5%5%8%51%
2879
February1st to 15thNight
5%8%37%5%25%45%9%42%
2385
16th to endNight
5%7%35%3345%5%6%47%
1894
March1st to 15thNight
47%2443345%7%51%
2160
16th to endNight
7%6%2442345%9%45%
2002
April1st to 15thNight
9%6%3432445%8%47%
1798
16th to endNight
13%6%36%5%2445%7%40%
1746
May1st to 15thNight
11%5%134335%6%7%46%
1550
16th to endNight
12%4244245%6%9%42%
1497
June1st to 15thNight
7%4144245%6%10%47%
1440
16th to endNight
22122245%6%9%59%
1440
July1st to 15thNight
5%325%435%5%5%8%52%
1440
16th to endNight
211232345%8%61%
1512
August1st to 15thNight
3214425%5%6%10%53%
1563
16th to endNight
5%213423446%60%
1910
September1st to 15thNight
8%414322347%57%
1800
16th to endNight
6%312212346%63%
1965
October1st to 15thNight
12%423312347%51%
2102
16th to endNight
6%423423347%58%
2418
November1st to 15thNight
6%313424447%55%
2470
16th to endNight
35%1442445%9%54%
2623
December1st to 15thNight
47%345%2436%7%49%
2730
16th to endNight
47%35%42445%7%49%
2912

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
32%6%18%30%10%1
1553
16th to endDay
30%5%17%31%13%2
1710
February1st to 15thDay
39%7%17%23%9%2
1731
16th to endDay
36%5%18%24%10%4
1580
March1st to 15thDay
28%6%17%28%16%3
1800
16th to endDay
37%6%14%26%12%2
2218
April1st to 15thDay
36%7%15%26%10%2
2150
16th to endDay
42%6%15%20%14%1
2214
May1st to 15thDay
37%6%16%27%11%
2397
16th to endDay
41%8%16%22%9%1
2620
June1st to 15thDay
29%8%15%26%16%3
2520
16th to endDay
18%5%12%29%25%8%
2520
July1st to 15thDay
26%6%14%21%20%10%
2371
16th to endDay
21%7%11%24%23%10%
2489
August1st to 15thDay
25%7%15%25%16%9%
2376
16th to endDay
22%49%22%29%11%
2292
September1st to 15thDay
26%37%22%25%12%
2160
16th to endDay
20%311%32%27%4
1993
October1st to 15thDay
32%5%11%24%20%4
1857
16th to endDay
22%5%14%32%18%6%
1794
November1st to 15thDay
26%5%14%26%19%6%
1718
16th to endDay
23%418%31%20%2
1664
December1st to 15thDay
31%5%20%27%13%1
1560
16th to endDay
35%6%18%26%12%1
1664
January1st to 15thNight
31%7%18%26%13%2
2716
16th to endNight
29%6%16%29%15%2
2879
February1st to 15thNight
37%8%17%24%9%2
2395
16th to endNight
34%6%15%26%12%4
1894
March1st to 15thNight
31%5%14%28%15%4
2160
16th to endNight
35%6%15%25%14%1
2002
April1st to 15thNight
35%6%16%25%12%3
1798
16th to endNight
41%7%13%22%13%1
1746
May1st to 15thNight
34%8%16%26%11%1
1551
16th to endNight
36%9%19%21%9%2
1498
June1st to 15thNight
31%8%23%21%12%3
1440
16th to endNight
18%8%16%30%19%6%
1440
July1st to 15thNight
29%6%13%25%15%8%
1360
16th to endNight
19%6%14%28%21%9%
1416
August1st to 15thNight
24%7%18%27%14%7%
1555
16th to endNight
22%6%10%21%28%10%
1910
September1st to 15thNight
27%5%10%25%22%9%
1800
16th to endNight
21%39%33%23%7%
1965
October1st to 15thNight
33%414%20%21%4
2102
16th to endNight
26%5%12%28%20%7%
2418
November1st to 15thNight
26%5%13%26%22%6%
2470
16th to endNight
25%414%31%18%4
2623
December1st to 15thNight
33%6%18%27%12%2
2730
16th to endNight
32%7%19%26%12%1
2912

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
8%7%40%24%14%4
135
16th to endDay
9%10%38%29%9%2
144
February1st to 15thDay
10%15%56%15%2
126
16th to endDay
11%16%35%27%9%
81
March1st to 15thDay
11%6%50%24%7%
90
16th to endDay
15%14%39%22%7%1
264
April1st to 15thDay
14%17%37%21%8%1
269
16th to endDay
20%15%30%21%9%1
324
May1st to 15thDay
15%10%30%27%11%4
468
16th to endDay
18%7%29%25%15%2
517
June1st to 15thDay
8%6%27%32%18%6%
495
16th to endDay
46%31%37%18%1
495
July1st to 15thDay
8%222%35%26%4
475
16th to endDay
4221%40%27%2
515
August1st to 15thDay
6%322%41%21%4
424
16th to endDay
6%325%30%26%8%
332
September1st to 15thDay
6%6%27%32%20%6%
315
16th to endDay
8%8%25%33%18%6%
148
October1st to 15thDay
15%434%23%16%5%
135
16th to endDay
413%31%29%13%6%
144
November1st to 15thDay
15%35%34%19%4
135
16th to endDay
17%7%40%29%5%
135
December1st to 15thDay
7%16%51%16%8%
135
16th to endDay
10%9%51%23%41
144
January1st to 15thNight
6%13%41%27%8%1
975
16th to endNight
6%11%47%28%5%
1007
February1st to 15thNight
8%9%48%27%5%
752
16th to endNight
10%10%44%28%5%
632
March1st to 15thNight
8%8%42%33%7%
720
16th to endNight
10%9%44%30%5%
637
April1st to 15thNight
11%10%43%30%3
539
16th to endNight
16%12%30%33%7%
540
May1st to 15thNight
12%7%32%34%11%
540
16th to endNight
15%437%31%10%
563
June1st to 15thNight
11%5%35%35%10%1
540
16th to endNight
3341%44%7%
540
July1st to 15thNight
6%122%51%16%1
510
16th to endNight
2124%51%19%
564
August1st to 15thNight
5%126%51%15%
539
16th to endNight
5%26%51%15%
573
September1st to 15thNight
10%327%38%18%1
540
16th to endNight
8%431%40%14%
537
October1st to 15thNight
16%6%31%32%11%1
662
16th to endNight
8%7%34%36%11%
882
November1st to 15thNight
7%8%40%33%8%1
950
16th to endNight
6%9%42%33%7%
975
December1st to 15thNight
8%11%50%25%5%
975
16th to endNight
9%10%45%29%5%
1040
Page generated at 2018-02-13 18:46:00. Version ac04

Copyright 2018 A. Danko


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