Smithville Reservoir
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Smithville Reservoir clear sky chart from 2005-11-05 to 2018-04-23.

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
41%
16806
23%
49607
13%
16759
50%
16759
31%
29873

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
32%
975
22%
2522
9%
970
42%
970
32%
1598
January16th to endNight
27%
1040
25%
2704
8%
1040
38%
1040
32%
1712
February1st to 15thNight
24%
955
15%
2483
6%
951
30%
951
22%
1770
February16th to endNight
26%
734
22%
2100
7%
734
37%
734
27%
1335
March1st to 15thNight
33%
585
22%
2145
12%
585
45%
585
25%
1228
March16th to endNight
25%
624
15%
2288
10%
624
33%
624
17%
1527
April1st to 15thNight
32%
584
21%
1996
14%
584
44%
584
28%
1152
April16th to endNight
31%
558
22%
1771
14%
558
44%
558
24%
1147
May1st to 15thNight
43%
539
19%
1620
15%
539
49%
539
25%
1043
May16th to endNight
47%
563
20%
1607
13%
561
54%
561
34%
975
June1st to 15thNight
63%
540
19%
1440
11%
540
66%
540
43%
821
June16th to endNight
62%
540
25%
1440
15%
540
66%
540
52%
776
July1st to 15thNight
69%
510
20%
1485
14%
510
72%
510
42%
826
July16th to endNight
72%
564
25%
1594
23%
531
76%
531
45%
825
August1st to 15thNight
77%
539
24%
1610
26%
536
80%
536
45%
839
August16th to endNight
70%
573
27%
1815
30%
573
74%
573
40%
967
September1st to 15thNight
64%
540
27%
1836
29%
540
67%
540
33%
1032
September16th to endNight
62%
539
29%
1982
26%
539
70%
539
35%
1008
October1st to 15thNight
43%
720
27%
2160
18%
720
49%
720
35%
1250
October16th to endNight
39%
768
29%
2304
15%
768
52%
768
36%
1270
November1st to 15thNight
40%
826
28%
2356
14%
826
52%
826
36%
1322
November16th to endNight
31%
975
25%
2730
10%
975
44%
975
32%
1650
December1st to 15thNight
30%
975
18%
2730
7%
975
39%
975
25%
1797
December16th to endNight
24%
1040
21%
2889
7%
1040
36%
1040
22%
2003

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
12%6%35%42445%7%43%
49899
Night
11%5%24424347%48%
49802
TransparencyDay
39%5%13%25%14%2
49599
Night
35%412%27%17%3
49607
SeeingDay
14%7%27%29%18%4
6589
Night
14%8%30%32%12%1
16807

By Month

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
11%6%36%6%34347%42%
1746
16th to endDay
12%10%46%434445%40%
1872
February1st to 15thDay
12%9%5%6%5%33346%37%
1710
16th to endDay
12%9%37%42435%5%40%
1669
March1st to 15thDay
12%9%36%5%2445%7%38%
2145
16th to endDay
20%11%45%5%24345%31%
2286
April1st to 15thDay
16%8%35%424345%41%
2280
16th to endDay
19%8%35%42445%7%32%
2301
May1st to 15thDay
16%9%46%5%25%347%35%
2331
16th to endDay
13%6%245%345%6%7%38%
2508
June1st to 15thDay
8%5%25%5%35%5%6%8%44%
2520
16th to endDay
5%214425%47%10%49%
2520
July1st to 15thDay
7%424435%5%7%9%45%
2382
16th to endDay
7%214425%5%6%8%48%
2466
August1st to 15thDay
6%415%435%45%10%47%
2340
16th to endDay
10%424425%45%8%48%
2386
September1st to 15thDay
11%5%13424446%48%
2121
16th to endDay
8%42342445%7%52%
1965
October1st to 15thDay
15%414423336%49%
1800
16th to endDay
12%5%24313346%52%
1920
November1st to 15thDay
10%5%23323246%54%
1827
16th to endDay
17%6%23313336%48%
1560
December1st to 15thDay
12%8%45%5%35%445%39%
1560
16th to endDay
13%10%37%4245%5%5%36%
1684
January1st to 15thNight
8%5%25%5%2435%7%48%
2522
16th to endNight
9%7%35%32335%6%48%
2704
February1st to 15thNight
11%10%46%6%35%445%37%
2473
16th to endNight
12%7%35%423346%45%
2100
March1st to 15thNight
11%6%25%42435%6%47%
2145
16th to endNight
19%9%35%424447%34%
2288
April1st to 15thNight
11%7%23423345%49%
1996
16th to endNight
17%7%25%423436%41%
1771
May1st to 15thNight
12%5%25%5%25%446%42%
1619
16th to endNight
10%325%423447%49%
1605
June1st to 15thNight
5%223425%5%6%9%52%
1440
16th to endNight
32113335%6%9%59%
1440
July1st to 15thNight
6%31342446%8%54%
1575
16th to endNight
42134245%6%11%52%
1702
August1st to 15thNight
3213325%45%11%55%
1620
16th to endNight
7%414334246%57%
1815
September1st to 15thNight
10%4145%13446%52%
1836
16th to endNight
7%21442445%7%55%
1982
October1st to 15thNight
14%5%13323235%54%
2160
16th to endNight
12%413312245%56%
2304
November1st to 15thNight
9%5%13313236%57%
2356
16th to endNight
14%6%23323345%51%
2730
December1st to 15thNight
13%7%35%5%24345%43%
2730
16th to endNight
15%8%46%423335%38%
2889

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
42%312%24%15%1
1747
16th to endDay
46%315%22%10%1
1872
February1st to 15thDay
48%416%21%8%1
1711
16th to endDay
45%313%20%14%1
1669
March1st to 15thDay
44%413%24%11%1
2145
16th to endDay
56%412%18%8%1
2288
April1st to 15thDay
45%314%24%12%
2280
16th to endDay
50%5%12%20%10%
2301
May1st to 15thDay
49%5%12%22%10%
2331
16th to endDay
43%6%16%20%11%1
2512
June1st to 15thDay
35%6%13%28%14%1
2520
16th to endDay
27%7%18%29%15%1
2520
July1st to 15thDay
33%6%16%26%13%2
2243
16th to endDay
29%5%13%33%15%1
2311
August1st to 15thDay
31%6%16%28%16%1
2326
16th to endDay
33%6%11%24%17%5%
2386
September1st to 15thDay
34%6%11%23%17%5%
2121
16th to endDay
30%5%11%31%19%1
1965
October1st to 15thDay
36%39%26%19%4
1800
16th to endDay
33%311%27%19%4
1920
November1st to 15thDay
32%313%26%20%4
1827
16th to endDay
38%211%29%17%
1560
December1st to 15thDay
46%415%22%10%
1560
16th to endDay
48%413%21%10%1
1684
January1st to 15thNight
35%414%27%17%
2522
16th to endNight
37%315%26%15%1
2704
February1st to 15thNight
48%412%20%11%2
2483
16th to endNight
40%312%21%19%3
2100
March1st to 15thNight
37%311%26%16%3
2145
16th to endNight
49%412%21%9%1
2288
April1st to 15thNight
36%311%27%18%2
1996
16th to endNight
44%310%24%15%1
1771
May1st to 15thNight
41%5%13%23%15%1
1620
16th to endNight
34%5%16%26%15%1
1607
June1st to 15thNight
25%6%18%31%16%2
1440
16th to endNight
20%5%16%33%22%2
1440
July1st to 15thNight
25%6%12%34%17%3
1485
16th to endNight
23%413%37%18%1
1594
August1st to 15thNight
22%5%17%32%19%2
1610
16th to endNight
27%39%28%23%6%
1815
September1st to 15thNight
32%48%25%21%6%
1836
16th to endNight
27%5%11%31%21%3
1982
October1st to 15thNight
33%37%26%22%6%
2160
16th to endNight
30%29%27%24%4
2304
November1st to 15thNight
29%312%25%21%7%
2356
16th to endNight
36%210%30%18%2
2730
December1st to 15thNight
43%313%26%12%
2730
16th to endNight
48%311%21%12%2
2889

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
20%12%39%22%5%
135
16th to endDay
15%15%42%21%5%
144
February1st to 15thDay
19%19%48%9%3
135
16th to endDay
18%20%38%13%8%
120
March1st to 15thDay
23%13%42%17%2
135
16th to endDay
34%13%29%20%2
144
April1st to 15thDay
22%12%32%23%8%
279
16th to endDay
25%10%33%19%9%
374
May1st to 15thDay
18%9%31%27%10%1
468
16th to endDay
19%6%34%23%13%2
517
June1st to 15thDay
8%426%32%22%5%
495
16th to endDay
4431%35%18%4
495
July1st to 15thDay
12%216%37%25%6%
475
16th to endDay
7%112%37%35%5%
515
August1st to 15thDay
5%113%37%35%7%
493
16th to endDay
10%314%32%29%9%
426
September1st to 15thDay
9%214%37%28%6%
276
16th to endDay
11%119%44%14%8%
135
October1st to 15thDay
11%6%35%28%11%6%
135
16th to endDay
9%9%38%31%9%
144
November1st to 15thDay
14%333%27%13%8%
135
16th to endDay
29%10%33%16%10%
135
December1st to 15thDay
11%21%42%15%5%3
135
16th to endDay
20%14%42%21%1
144
January1st to 15thNight
12%13%37%28%7%
975
16th to endNight
13%12%42%27%4
1040
February1st to 15thNight
16%13%39%26%3
955
16th to endNight
18%13%38%24%4
734
March1st to 15thNight
15%12%34%29%7%
585
16th to endNight
25%8%35%23%5%
624
April1st to 15thNight
14%11%37%30%5%
584
16th to endNight
21%7%33%28%8%
558
May1st to 15thNight
14%7%30%35%11%1
540
16th to endNight
12%430%36%13%2
563
June1st to 15thNight
6%220%46%20%2
540
16th to endNight
3227%45%19%1
540
July1st to 15thNight
7%114%44%28%2
510
16th to endNight
5%14%44%33%1
564
August1st to 15thNight
310%46%36%1
539
16th to endNight
9%112%39%32%4
573
September1st to 15thNight
13%114%38%26%5%
540
16th to endNight
7%420%40%24%2
539
October1st to 15thNight
16%6%30%28%16%2
720
16th to endNight
15%9%32%32%10%
768
November1st to 15thNight
12%11%32%32%10%
826
16th to endNight
17%12%36%26%7%
975
December1st to 15thNight
19%14%32%27%6%
975
16th to endNight
18%12%37%26%5%
1040
Page generated at 2018-04-24 09:03:03. Version ac04

Copyright 2018 A. Danko


Smithville Reservoir Clear Sky Chart |Charts Home