Joplin
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Joplin clear sky chart from 2005-11-06 to 2025-05-11.

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 Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(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

By Month

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 Forecast	Data Points
Cloud Cover	Day	11% 7% 2 6% 4 4 4 3 5% 7% 46%	113758
	Night	11% 7% 2 6% 4 3 3 3 4 6% 50%	115384
Transparency	Day	37% 4 11% 26% 18% 4	117410
	Night	35% 3 10% 26% 21% 5%	119874
Seeing	Day	15% 11% 29% 27% 14% 3	16145
	Night	15% 12% 33% 29% 11% 1	26113

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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	16% 11% 4 6% 4 4 3 2 3 5% 41%	4077
	11th to 20th	Day	8% 9% 3 8% 6% 3 4 3 4 5% 46%	4080
	21st to end	Day	17% 11% 2 6% 3 3 3 2 4 5% 45%	4488
February	1st to 10th	Day	15% 12% 3 7% 4 4 3 3 5% 5% 39%	1800
	11th to 20th	Day	14% 8% 3 8% 4 4 4 2 4 5% 44%	1764
	21st to end	Day	14% 9% 3 6% 4 4 3 3 6% 6% 40%	1764
March	1st to 10th	Day	12% 8% 2 5% 3 3 4 3 5% 5% 50%	4936
	11th to 20th	Day	10% 7% 1 4 3 3 3 3 5% 7% 54%	4980
	21st to end	Day	13% 9% 3 7% 5% 5% 5% 4 6% 8% 34%	5462
April	1st to 10th	Day	13% 7% 3 6% 4 3 4 4 5% 7% 44%	2300
	11th to 20th	Day	16% 7% 2 6% 5% 4 4 3 5% 6% 41%	2374
	21st to end	Day	21% 8% 2 6% 4 4 4 3 4 6% 37%	2462
May	1st to 10th	Day	20% 8% 2 7% 4 4 4 4 5% 6% 36%	4212
	11th to 20th	Day	12% 6% 2 7% 5% 5% 4 5% 6% 8% 40%	4083
	21st to end	Day	14% 6% 3 6% 5% 5% 4 5% 6% 8% 37%	4477
June	1st to 10th	Day	7% 4 1 6% 3 5% 5% 4 6% 11% 48%	2470
	11th to 20th	Day	6% 4 2 5% 4 4 4 5% 6% 10% 49%	2470
	21st to end	Day	5% 3 1 3 4 4 4 4 7% 10% 56%	2470
July	1st to 10th	Day	10% 5% 3 6% 5% 4 5% 5% 7% 9% 41%	4120
	11th to 20th	Day	5% 4 2 5% 4 4 4 4 7% 11% 51%	4120
	21st to end	Day	6% 4 1 5% 4 4 5% 5% 8% 12% 46%	4465
August	1st to 10th	Day	5% 4 1 4 4 3 4 3 6% 9% 58%	4104
	11th to 20th	Day	7% 5% 2 6% 5% 5% 5% 4 6% 8% 45%	4041
	21st to end	Day	5% 4 2 5% 4 3 4 3 6% 8% 56%	4190
September	1st to 10th	Day	10% 5% 2 5% 4 3 4 3 5% 6% 53%	2280
	11th to 20th	Day	10% 5% 2 6% 5% 4 4 5% 6% 7% 47%	2101
	21st to end	Day	7% 5% 2 5% 3 4 4 4 6% 7% 53%	2076
October	1st to 10th	Day	11% 4 2 4 3 3 4 3 4 7% 54%	1900
	11th to 20th	Day	12% 5% 2 4 2 2 2 3 5% 5% 58%	1900
	21st to end	Day	18% 6% 2 5% 2 3 3 3 3 5% 51%	2090
November	1st to 10th	Day	11% 5% 2 5% 2 2 3 2 4 6% 58%	1958
	11th to 20th	Day	13% 7% 2 4 2 3 3 3 4 5% 54%	1887
	21st to end	Day	14% 8% 2 6% 3 2 3 3 4 7% 50%	1659
December	1st to 10th	Day	10% 10% 2 4 3 3 3 3 4 5% 53%	2610
	11th to 20th	Day	9% 10% 3 6% 4 3 3 2 4 5% 51%	3100
	21st to end	Day	19% 20% 5% 8% 4 4 3 2 4 4 27%	4488
January	1st to 10th	Night	14% 9% 3 9% 6% 4 3 2 4 5% 42%	5888
	11th to 20th	Night	8% 7% 3 9% 6% 4 4 3 3 5% 49%	5900
	21st to end	Night	17% 11% 3 7% 3 2 2 2 3 5% 46%	6490
February	1st to 10th	Night	15% 12% 2 6% 4 3 4 3 5% 5% 43%	2600
	11th to 20th	Night	15% 9% 3 7% 4 3 3 3 4 4 45%	2533
	21st to end	Night	14% 8% 2 6% 4 3 3 3 5% 5% 47%	1872
March	1st to 10th	Night	13% 10% 3 6% 4 3 3 3 4 5% 47%	4919
	11th to 20th	Night	10% 6% 2 4 3 3 3 3 4 6% 56%	4980
	21st to end	Night	10% 6% 3 6% 5% 4 4 3 6% 7% 45%	5467
April	1st to 10th	Night	11% 7% 2 6% 3 3 3 3 4 6% 52%	2099
	11th to 20th	Night	14% 7% 2 4 4 3 3 3 4 6% 49%	1975
	21st to end	Night	17% 7% 2 6% 5% 3 4 3 4 7% 42%	1934
May	1st to 10th	Night	14% 7% 2 6% 4 4 4 3 5% 7% 44%	2913
	11th to 20th	Night	14% 7% 3 6% 5% 4 3 4 5% 7% 42%	2828
	21st to end	Night	10% 6% 2 6% 4 3 4 4 6% 9% 46%	3090
June	1st to 10th	Night	6% 4 2 4 4 4 4 5% 6% 9% 53%	1710
	11th to 20th	Night	4 3 1 4 4 4 4 5% 6% 11% 55%	1710
	21st to end	Night	3 3 2 3 4 3 4 3 7% 9% 60%	1710
July	1st to 10th	Night	10% 5% 2 5% 4 3 4 4 6% 8% 50%	2850
	11th to 20th	Night	2 2 1 4 4 4 4 4 5% 8% 61%	2850
	21st to end	Night	5% 4 1 5% 4 3 3 3 7% 10% 54%	3098
August	1st to 10th	Night	3 2 1 3 3 3 4 4 6% 9% 62%	2836
	11th to 20th	Night	8% 4 2 6% 3 3 5% 3 6% 8% 53%	2798
	21st to end	Night	3 2 1 4 3 3 4 3 6% 8% 64%	3466
September	1st to 10th	Night	9% 5% 2 4 3 2 3 2 5% 8% 58%	1900
	11th to 20th	Night	10% 5% 2 6% 3 3 3 3 5% 7% 53%	2076
	21st to end	Night	8% 4 2 5% 4 4 4 2 4 7% 57%	2090
October	1st to 10th	Night	7% 4 1 3 3 3 3 3 4 7% 63%	2274
	11th to 20th	Night	13% 4 2 3 3 3 3 3 4 5% 57%	2280
	21st to end	Night	15% 6% 2 5% 3 3 2 2 4 4 53%	2508
November	1st to 10th	Night	12% 5% 2 4 2 2 2 2 4 5% 61%	2340
	11th to 20th	Night	11% 6% 2 4 4 3 3 3 4 5% 54%	2510
	21st to end	Night	14% 7% 2 4 3 2 3 3 3 5% 54%	2735
December	1st to 10th	Night	9% 8% 3 5% 3 3 3 3 4 6% 53%	4580
	11th to 20th	Night	15% 8% 3 6% 3 3 3 2 3 5% 50%	5085
	21st to end	Night	17% 16% 5% 8% 4 3 4 3 3 4 32%	6490

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	47% 2 9% 25% 15% 2	4078
	11th to 20th	Day	40% 3 11% 25% 17% 5%	4080
	21st to end	Day	44% 2 8% 20% 20% 6%	4488
February	1st to 10th	Day	48% 4 10% 24% 11% 3	1800
	11th to 20th	Day	45% 3 9% 24% 16% 4	1773
	21st to end	Day	44% 3 6% 23% 16% 8%	1764
March	1st to 10th	Day	36% 3 8% 22% 19% 13%	4936
	11th to 20th	Day	31% 3 10% 21% 24% 11%	4980
	21st to end	Day	47% 5% 13% 27% 7% 1	5464
April	1st to 10th	Day	39% 5% 12% 24% 17% 3	2300
	11th to 20th	Day	43% 4 13% 20% 17% 3	2374
	21st to end	Day	49% 4 10% 23% 12% 1	2462
May	1st to 10th	Day	49% 5% 10% 21% 13% 1	4250
	11th to 20th	Day	42% 6% 14% 25% 13%	4087
	21st to end	Day	42% 7% 15% 23% 12% 1	4489
June	1st to 10th	Day	30% 7% 17% 28% 15% 2	2470
	11th to 20th	Day	30% 6% 15% 31% 17% 2	2470
	21st to end	Day	23% 6% 16% 31% 20% 4	2470
July	1st to 10th	Day	36% 6% 17% 22% 15% 3	4056
	11th to 20th	Day	27% 5% 12% 37% 18% 1	4051
	21st to end	Day	28% 7% 23% 32% 10% 1	4325
August	1st to 10th	Day	24% 5% 17% 27% 24% 3	4090
	11th to 20th	Day	35% 6% 17% 25% 16% 1	4080
	21st to end	Day	26% 6% 10% 41% 14% 4	4189
September	1st to 10th	Day	33% 4 10% 27% 17% 9%	2280
	11th to 20th	Day	35% 5% 10% 24% 24% 3	2101
	21st to end	Day	30% 6% 9% 26% 25% 5%	2076
October	1st to 10th	Day	19% 3 7% 17% 37% 18%	3160
	11th to 20th	Day	18% 2 5% 26% 36% 14%	3140
	21st to end	Day	29% 2 7% 32% 26% 5%	3428
November	1st to 10th	Day	29% 3 10% 30% 22% 6%	1958
	11th to 20th	Day	34% 3 9% 24% 23% 8%	1887
	21st to end	Day	37% 3 9% 25% 24% 2	1659
December	1st to 10th	Day	35% 3 8% 34% 20%	2610
	11th to 20th	Day	37% 2 6% 29% 23% 2	3097
	21st to end	Day	62% 3 7% 19% 8% 1	4488
January	1st to 10th	Night	47% 2 11% 25% 13% 2	5888
	11th to 20th	Night	40% 2 10% 23% 23% 3	5900
	21st to end	Night	44% 1 9% 19% 21% 5%	6490
February	1st to 10th	Night	44% 4 11% 23% 14% 4	2600
	11th to 20th	Night	43% 3 8% 25% 17% 3	2534
	21st to end	Night	39% 3 8% 21% 23% 6%	1872
March	1st to 10th	Night	41% 3 8% 19% 23% 6%	4919
	11th to 20th	Night	30% 3 7% 23% 26% 10%	4980
	21st to end	Night	37% 4 13% 30% 14% 2	5467
April	1st to 10th	Night	34% 4 11% 23% 21% 6%	2099
	11th to 20th	Night	37% 3 10% 24% 21% 5%	1975
	21st to end	Night	43% 4 11% 23% 17% 1	1934
May	1st to 10th	Night	40% 5% 13% 22% 16% 4	2940
	11th to 20th	Night	42% 5% 13% 25% 14% 1	2829
	21st to end	Night	34% 6% 16% 30% 14% 1	3099
June	1st to 10th	Night	27% 6% 17% 29% 17% 4	1710
	11th to 20th	Night	22% 6% 16% 31% 21% 3	1710
	21st to end	Night	20% 5% 16% 33% 21% 5%	1710
July	1st to 10th	Night	31% 5% 17% 24% 18% 5%	2805
	11th to 20th	Night	21% 5% 9% 40% 22% 3	2796
	21st to end	Night	24% 6% 19% 36% 15%	2999
August	1st to 10th	Night	18% 5% 15% 32% 25% 4	2826
	11th to 20th	Night	30% 5% 15% 29% 19% 2	2825
	21st to end	Night	19% 5% 12% 39% 21% 4	3466
September	1st to 10th	Night	27% 4 11% 27% 22% 9%	1900
	11th to 20th	Night	32% 4 9% 24% 26% 6%	2076
	21st to end	Night	29% 4 8% 26% 29% 5%	2090
October	1st to 10th	Night	14% 2 6% 17% 42% 19%	3794
	11th to 20th	Night	21% 2 5% 20% 33% 19%	3779
	21st to end	Night	31% 2 7% 29% 26% 5%	4120
November	1st to 10th	Night	28% 3 9% 26% 26% 8%	2340
	11th to 20th	Night	33% 3 6% 25% 26% 7%	2510
	21st to end	Night	35% 3 8% 25% 25% 4	2735
December	1st to 10th	Night	33% 3 10% 36% 17% 1	4580
	11th to 20th	Night	40% 1 6% 24% 24% 4	5087
	21st to end	Night	57% 3 8% 22% 8% 2	6490

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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	22% 17% 40% 18% 3	300
	11th to 20th	Day	25% 22% 40% 12% 1	300
	21st to end	Day	17% 21% 45% 15% 3	330
February	1st to 10th	Day	28% 22% 37% 11% 2	300
	11th to 20th	Day	24% 29% 35% 11% 2	300
	21st to end	Day	29% 22% 37% 11%	249
March	1st to 10th	Day	23% 21% 39% 15% 2	300
	11th to 20th	Day	28% 23% 33% 15% 2	300
	21st to end	Day	29% 22% 35% 10% 3	330
April	1st to 10th	Day	23% 21% 36% 17% 3 1	400
	11th to 20th	Day	24% 22% 35% 16% 3	492
	21st to end	Day	27% 17% 29% 21% 6%	562
May	1st to 10th	Day	20% 15% 37% 21% 7%	703
	11th to 20th	Day	16% 12% 34% 24% 12% 3	676
	21st to end	Day	15% 10% 33% 23% 13% 4	734
June	1st to 10th	Day	7% 4 24% 36% 23% 6%	680
	11th to 20th	Day	7% 3 26% 42% 18% 4	680
	21st to end	Day	4 5% 34% 37% 16% 4	680
July	1st to 10th	Day	10% 4 16% 35% 27% 8%	671
	11th to 20th	Day	4 3 19% 42% 25% 7%	668
	21st to end	Day	8% 2 17% 36% 28% 9%	739
August	1st to 10th	Day	9% 3 19% 39% 26% 4	676
	11th to 20th	Day	8% 4 20% 38% 27% 4	665
	21st to end	Day	9% 1 14% 35% 34% 7%	549
September	1st to 10th	Day	10% 2 13% 41% 27% 7%	490
	11th to 20th	Day	6% 2 26% 40% 20% 7%	311
	21st to end	Day	12% 6% 25% 32% 19% 6%	300
October	1st to 10th	Day	11% 11% 26% 32% 15% 5%	300
	11th to 20th	Day	14% 15% 38% 25% 7% 1	300
	21st to end	Day	28% 14% 33% 19% 4 1	330
November	1st to 10th	Day	17% 14% 41% 19% 7% 2	300
	11th to 20th	Day	19% 19% 35% 19% 7% 2	300
	21st to end	Day	23% 19% 35% 20% 4	300
December	1st to 10th	Day	19% 20% 39% 15% 6% 2	300
	11th to 20th	Day	21% 21% 36% 17% 4	300
	21st to end	Day	27% 22% 35% 14% 2	330
January	1st to 10th	Night	17% 17% 40% 22% 4	1000
	11th to 20th	Night	17% 20% 40% 19% 4	1000
	21st to end	Night	16% 17% 41% 23% 3	1100
February	1st to 10th	Night	23% 17% 40% 18% 3	1000
	11th to 20th	Night	21% 19% 41% 18% 2	979
	21st to end	Night	21% 20% 34% 22% 2	552
March	1st to 10th	Night	16% 17% 42% 23% 3	600
	11th to 20th	Night	24% 14% 39% 20% 3	600
	21st to end	Night	18% 17% 43% 17% 5%	660
April	1st to 10th	Night	14% 15% 42% 25% 3	600
	11th to 20th	Night	18% 15% 36% 25% 5%	593
	21st to end	Night	19% 15% 39% 21% 6%	600
May	1st to 10th	Night	14% 10% 39% 31% 7%	600
	11th to 20th	Night	16% 6% 32% 31% 14% 1	563
	21st to end	Night	10% 8% 32% 35% 13% 1	617
June	1st to 10th	Night	8% 4 20% 46% 22% 1	570
	11th to 20th	Night	5% 3 26% 47% 17% 1	570
	21st to end	Night	4 3 28% 49% 16% 1	570
July	1st to 10th	Night	8% 1 16% 43% 30% 2	555
	11th to 20th	Night	4 2 16% 48% 26% 4	552
	21st to end	Night	7% 2 13% 44% 30% 4	624
August	1st to 10th	Night	6% 1 17% 46% 29% 1	567
	11th to 20th	Night	7% 2 18% 48% 23% 2	564
	21st to end	Night	5% 1 17% 41% 33% 3	627
September	1st to 10th	Night	10% 2 16% 45% 25% 2	570
	11th to 20th	Night	11% 3 18% 43% 22% 3	570
	21st to end	Night	10% 5% 23% 38% 20% 3	570
October	1st to 10th	Night	9% 4 31% 35% 20% 2	754
	11th to 20th	Night	14% 9% 40% 29% 8% 1	760
	21st to end	Night	19% 12% 35% 24% 8% 1	836
November	1st to 10th	Night	14% 11% 42% 24% 9% 1	780
	11th to 20th	Night	15% 16% 37% 24% 8%	910
	21st to end	Night	19% 15% 37% 22% 7%	1000
December	1st to 10th	Night	18% 15% 40% 23% 4	1000
	11th to 20th	Night	21% 16% 36% 24% 3	1000
	21st to end	Night	19% 20% 37% 22% 3	1100

Page generated at 2025-05-08 08:33:56. Version ac07

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