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 2026-09-14.

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% 47%	148197
	Night	10% 7% 2 5% 4 3 4 3 5% 7% 50%	143259
Transparency	Day	36% 4 12% 27% 18% 4	151808
	Night	34% 4 11% 27% 21% 5%	147728
Seeing	Day	15% 11% 29% 27% 14% 3	18117
	Night	14% 11% 33% 29% 11% 1	27827

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	14% 10% 3 6% 4 4 3 2 4 6% 43%	5289
	11th to 20th	Day	6% 8% 3 8% 5% 3 3 3 4 5% 50%	5310
	21st to end	Day	15% 11% 2 6% 3 3 2 2 3 5% 47%	5812
February	1st to 10th	Day	15% 12% 3 7% 4 4 3 3 5% 5% 40%	1890
	11th to 20th	Day	14% 8% 3 8% 4 4 4 2 4 5% 45%	1855
	21st to end	Day	13% 9% 3 6% 4 4 3 3 6% 6% 42%	1850
March	1st to 10th	Day	12% 8% 2 5% 3 3 4 3 5% 5% 49%	5046
	11th to 20th	Day	10% 7% 1 4 3 3 3 3 5% 7% 54%	5090
	21st to end	Day	13% 9% 3 7% 5% 5% 5% 4 6% 7% 35%	5583
April	1st to 10th	Day	13% 7% 3 6% 4 3 4 4 5% 7% 44%	2415
	11th to 20th	Day	16% 7% 2 6% 5% 4 4 3 5% 7% 41%	2494
	21st to end	Day	21% 8% 2 6% 4 4 4 3 4 6% 36%	2585
May	1st to 10th	Day	17% 7% 2 6% 4 4 4 4 5% 7% 40%	7617
	11th to 20th	Day	12% 5% 2 6% 5% 4 5% 4 6% 8% 43%	7627
	21st to end	Day	20% 7% 3 7% 5% 5% 4 4 5% 7% 33%	8392
June	1st to 10th	Day	7% 4 1 5% 4 5% 5% 4 6% 11% 47%	2730
	11th to 20th	Day	7% 5% 2 5% 4 4 4 5% 6% 10% 48%	2730
	21st to end	Day	6% 3 1 4 4 4 4 4 7% 10% 55%	2730
July	1st to 10th	Day	6% 4 2 5% 5% 4 5% 5% 8% 11% 46%	7680
	11th to 20th	Day	5% 5% 2 6% 4 4 5% 4 7% 10% 47%	7680
	21st to end	Day	5% 4 2 6% 4 4 5% 5% 7% 11% 48%	8337
August	1st to 10th	Day	5% 3 1 5% 4 3 4 3 5% 8% 59%	6014
	11th to 20th	Day	5% 3 2 5% 4 4 5% 4 7% 9% 52%	5948
	21st to end	Day	5% 4 2 5% 4 4 4 3 6% 9% 57%	6103
September	1st to 10th	Day	10% 5% 2 5% 4 3 3 3 5% 6% 54%	2520
	11th to 20th	Day	10% 5% 2 6% 5% 4 4 5% 6% 8% 46%	2245
	21st to end	Day	7% 5% 2 5% 3 4 4 4 5% 7% 53%	2185
October	1st to 10th	Day	10% 4 2 4 3 3 4 3 4 7% 54%	2000
	11th to 20th	Day	12% 5% 2 4 3 2 2 3 5% 5% 57%	2000
	21st to end	Day	19% 7% 2 5% 2 3 3 3 3 5% 50%	2200
November	1st to 10th	Day	11% 5% 2 4 2 2 3 2 4 6% 58%	2058
	11th to 20th	Day	13% 7% 2 3 2 3 3 3 4 6% 53%	1981
	21st to end	Day	14% 8% 2 6% 3 2 3 3 4 7% 49%	1742
December	1st to 10th	Day	10% 10% 2 4 3 3 3 3 4 5% 53%	2690
	11th to 20th	Day	9% 10% 3 6% 4 3 3 2 4 5% 51%	3182
	21st to end	Day	19% 19% 5% 8% 4 4 3 2 4 4 28%	4587
January	1st to 10th	Night	13% 10% 3 8% 5% 3 3 2 3 5% 44%	7634
	11th to 20th	Night	7% 6% 3 8% 5% 4 4 3 3 5% 54%	7680
	21st to end	Night	16% 9% 3 6% 3 4 3 2 4 5% 45%	8402
February	1st to 10th	Night	14% 11% 2 6% 4 3 4 3 5% 5% 44%	2730
	11th to 20th	Night	15% 8% 3 7% 4 3 3 3 4 5% 45%	2663
	21st to end	Night	13% 8% 2 6% 4 3 3 3 5% 5% 48%	1962
March	1st to 10th	Night	13% 10% 3 6% 4 3 3 3 4 5% 47%	5029
	11th to 20th	Night	10% 6% 2 4 3 3 3 3 5% 6% 56%	5090
	21st to end	Night	10% 6% 2 6% 5% 4 4 4 6% 7% 46%	5588
April	1st to 10th	Night	11% 7% 2 6% 3 3 3 3 4 7% 52%	2204
	11th to 20th	Night	14% 7% 2 4 4 3 3 3 4 6% 48%	2075
	21st to end	Night	16% 7% 2 6% 4 4 4 3 4 6% 43%	2031
May	1st to 10th	Night	13% 7% 2 6% 4 4 4 3 5% 7% 46%	5266
	11th to 20th	Night	12% 5% 2 5% 4 4 4 4 6% 10% 44%	5265
	21st to end	Night	17% 8% 3 6% 4 4 4 3 5% 8% 39%	5793
June	1st to 10th	Night	7% 4 2 4 4 4 4 4 6% 9% 52%	1890
	11th to 20th	Night	6% 3 1 4 4 4 4 5% 6% 11% 54%	1890
	21st to end	Night	3 3 2 4 4 4 3 3 7% 9% 59%	1890
July	1st to 10th	Night	6% 4 1 4 3 4 5% 4 7% 11% 51%	5308
	11th to 20th	Night	3 3 1 5% 4 4 5% 4 6% 9% 55%	5307
	21st to end	Night	3 3 1 4 4 4 4 4 7% 11% 55%	5770
August	1st to 10th	Night	2 2 1 4 3 3 4 3 6% 8% 63%	4156
	11th to 20th	Night	5% 3 1 5% 3 3 4 3 5% 8% 59%	4118
	21st to end	Night	3 3 1 4 3 3 4 3 5% 8% 64%	5024
September	1st to 10th	Night	9% 5% 2 4 3 2 3 2 5% 8% 56%	2100
	11th to 20th	Night	9% 5% 2 6% 3 4 3 3 5% 8% 52%	2217
	21st to end	Night	8% 4 2 5% 4 4 4 2 4 7% 57%	2200
October	1st to 10th	Night	7% 4 1 3 3 3 3 3 4 7% 63%	2394
	11th to 20th	Night	12% 5% 2 3 3 3 3 3 4 5% 57%	2400
	21st to end	Night	16% 7% 2 5% 3 3 2 2 4 4 52%	2640
November	1st to 10th	Night	12% 5% 2 3 2 2 2 2 4 5% 61%	2460
	11th to 20th	Night	11% 6% 2 4 3 3 3 3 4 6% 55%	2636
	21st to end	Night	15% 7% 2 4 3 2 3 3 3 5% 52%	2872
December	1st to 10th	Night	8% 9% 3 5% 3 3 3 3 4 6% 53%	4720
	11th to 20th	Night	15% 8% 3 5% 3 3 3 2 3 5% 50%	5222
	21st to end	Night	17% 16% 5% 8% 4 3 4 3 3 5% 33%	6633

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	44% 2 9% 27% 16% 2	5290
	11th to 20th	Day	37% 2 9% 29% 18% 5%	5310
	21st to end	Day	43% 2 8% 21% 20% 5%	5812
February	1st to 10th	Day	47% 4 10% 25% 12% 2	1890
	11th to 20th	Day	44% 3 9% 24% 16% 4	1864
	21st to end	Day	43% 3 6% 22% 18% 8%	1850
March	1st to 10th	Day	37% 3 8% 22% 18% 12%	5046
	11th to 20th	Day	31% 3 10% 21% 24% 11%	5090
	21st to end	Day	47% 5% 13% 27% 8% 1	5585
April	1st to 10th	Day	39% 5% 12% 24% 17% 3	2415
	11th to 20th	Day	43% 5% 13% 19% 17% 3	2494
	21st to end	Day	49% 4 10% 24% 12% 1	2585
May	1st to 10th	Day	44% 4 9% 25% 16% 1	7655
	11th to 20th	Day	39% 5% 11% 24% 19% 2	7631
	21st to end	Day	49% 6% 12% 19% 13% 1	8405
June	1st to 10th	Day	31% 7% 16% 27% 16% 2	2730
	11th to 20th	Day	31% 6% 15% 30% 16% 2	2730
	21st to end	Day	24% 6% 17% 30% 19% 4	2730
July	1st to 10th	Day	30% 6% 17% 27% 18% 2	7616
	11th to 20th	Day	29% 7% 16% 29% 15% 4	7611
	21st to end	Day	29% 6% 19% 37% 9%	8155
August	1st to 10th	Day	24% 5% 14% 27% 27% 2	6000
	11th to 20th	Day	27% 6% 16% 32% 18% 1	5987
	21st to end	Day	25% 5% 14% 37% 16% 3	6102
September	1st to 10th	Day	32% 4 10% 28% 18% 8%	2520
	11th to 20th	Day	35% 5% 11% 24% 22% 2	2245
	21st to end	Day	30% 6% 9% 25% 25% 5%	2185
October	1st to 10th	Day	19% 3 7% 17% 38% 17%	3260
	11th to 20th	Day	19% 2 5% 26% 35% 13%	3240
	21st to end	Day	30% 2 7% 31% 26% 5%	3538
November	1st to 10th	Day	29% 3 10% 31% 22% 5%	2058
	11th to 20th	Day	34% 3 9% 25% 22% 7%	1981
	21st to end	Day	38% 3 9% 25% 23% 2	1742
December	1st to 10th	Day	35% 3 8% 34% 19%	2690
	11th to 20th	Day	37% 2 6% 30% 23% 2	3179
	21st to end	Day	61% 3 7% 20% 8% 1	4587
January	1st to 10th	Night	45% 2 10% 28% 14% 2	7635
	11th to 20th	Night	35% 2 9% 25% 26% 4	7680
	21st to end	Night	44% 2 10% 19% 21% 4	8402
February	1st to 10th	Night	43% 4 11% 24% 14% 4	2730
	11th to 20th	Night	43% 3 8% 25% 17% 3	2664
	21st to end	Night	38% 3 8% 21% 23% 7%	1962
March	1st to 10th	Night	42% 3 8% 18% 23% 6%	5029
	11th to 20th	Night	30% 3 7% 24% 26% 10%	5090
	21st to end	Night	37% 4 13% 30% 14% 2	5588
April	1st to 10th	Night	34% 4 11% 24% 21% 6%	2204
	11th to 20th	Night	37% 3 10% 23% 21% 5%	2075
	21st to end	Night	42% 4 11% 24% 16% 1	2031
May	1st to 10th	Night	39% 5% 12% 26% 16% 2	5293
	11th to 20th	Night	37% 4 14% 25% 16% 5%	5266
	21st to end	Night	44% 5% 13% 23% 11% 2	5805
June	1st to 10th	Night	29% 6% 16% 29% 17% 4	1890
	11th to 20th	Night	24% 6% 16% 31% 20% 3	1890
	21st to end	Night	21% 5% 15% 33% 21% 4	1890
July	1st to 10th	Night	26% 5% 17% 29% 20% 3	5265
	11th to 20th	Night	24% 7% 14% 34% 15% 5%	5256
	21st to end	Night	22% 6% 18% 39% 15%	5641
August	1st to 10th	Night	19% 5% 13% 30% 29% 4	4146
	11th to 20th	Night	25% 4 14% 34% 22% 1	4145
	21st to end	Night	19% 4 13% 37% 22% 3	5024
September	1st to 10th	Night	28% 4 11% 26% 22% 9%	2100
	11th to 20th	Night	32% 4 10% 25% 24% 5%	2217
	21st to end	Night	28% 4 8% 25% 29% 5%	2200
October	1st to 10th	Night	14% 2 6% 17% 42% 18%	3914
	11th to 20th	Night	22% 2 5% 20% 32% 19%	3899
	21st to end	Night	32% 2 7% 29% 26% 5%	4252
November	1st to 10th	Night	28% 3 9% 27% 27% 7%	2460
	11th to 20th	Night	32% 3 7% 27% 25% 6%	2636
	21st to end	Night	37% 3 8% 25% 24% 4	2872
December	1st to 10th	Night	34% 3 10% 35% 17% 1	4720
	11th to 20th	Night	40% 2 7% 24% 24% 3	5224
	21st to end	Night	56% 2 8% 22% 9% 2	6633

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	21% 16% 41% 19% 3	330
	11th to 20th	Day	24% 22% 39% 12% 2	330
	21st to end	Day	17% 20% 46% 14% 3	363
February	1st to 10th	Day	25% 22% 38% 12% 2	330
	11th to 20th	Day	24% 27% 36% 12% 2	330
	21st to end	Day	28% 24% 36% 11%	273
March	1st to 10th	Day	25% 21% 38% 14% 2	330
	11th to 20th	Day	29% 21% 34% 14% 2	330
	21st to end	Day	27% 22% 37% 10% 3	363
April	1st to 10th	Day	22% 21% 35% 17% 3	435
	11th to 20th	Day	24% 22% 36% 15% 3	532
	21st to end	Day	26% 18% 30% 20% 6%	605
May	1st to 10th	Day	19% 15% 38% 21% 7%	753
	11th to 20th	Day	16% 13% 33% 23% 11% 3	775
	21st to end	Day	17% 10% 32% 23% 13% 4	844
June	1st to 10th	Day	8% 6% 25% 35% 21% 5%	780
	11th to 20th	Day	8% 5% 26% 39% 18% 4	780
	21st to end	Day	5% 6% 34% 36% 16% 3	780
July	1st to 10th	Day	9% 4 16% 36% 27% 8%	771
	11th to 20th	Day	5% 3 19% 43% 24% 6%	768
	21st to end	Day	7% 2 16% 38% 28% 9%	849
August	1st to 10th	Day	9% 3 20% 39% 24% 5%	776
	11th to 20th	Day	7% 4 19% 40% 26% 5%	765
	21st to end	Day	10% 1 16% 36% 30% 7%	638
September	1st to 10th	Day	9% 3 12% 42% 27% 7%	570
	11th to 20th	Day	7% 2 23% 39% 22% 7%	351
	21st to end	Day	12% 6% 24% 32% 20% 6%	330
October	1st to 10th	Day	10% 10% 26% 34% 15% 5%	330
	11th to 20th	Day	14% 14% 38% 24% 7% 2	330
	21st to end	Day	30% 13% 32% 19% 4 1	363
November	1st to 10th	Day	16% 14% 43% 19% 6% 2	330
	11th to 20th	Day	18% 18% 37% 18% 7% 2	330
	21st to end	Day	24% 18% 34% 19% 4	330
December	1st to 10th	Day	20% 20% 38% 14% 6% 2	330
	11th to 20th	Day	21% 20% 38% 17% 4	330
	21st to end	Day	26% 21% 37% 15% 2	363
January	1st to 10th	Night	17% 17% 40% 22% 4	1050
	11th to 20th	Night	16% 21% 41% 18% 3	1050
	21st to end	Night	16% 17% 41% 23% 3	1155
February	1st to 10th	Night	21% 16% 41% 18% 3	1050
	11th to 20th	Night	21% 19% 41% 17% 2	1029
	21st to end	Night	20% 20% 35% 22% 2	578
March	1st to 10th	Night	17% 17% 41% 22% 3	630
	11th to 20th	Night	23% 15% 39% 20% 3	630
	21st to end	Night	18% 17% 44% 17% 5%	693
April	1st to 10th	Night	15% 15% 42% 26% 3	630
	11th to 20th	Night	18% 16% 37% 24% 5%	623
	21st to end	Night	18% 16% 40% 20% 6%	630
May	1st to 10th	Night	14% 10% 40% 31% 6%	630
	11th to 20th	Night	15% 7% 33% 30% 13% 1	621
	21st to end	Night	11% 8% 30% 36% 13% 1	683
June	1st to 10th	Night	8% 4 21% 44% 21% 1	630
	11th to 20th	Night	7% 3 26% 46% 17% 1	630
	21st to end	Night	4 3 28% 48% 15% 1	630
July	1st to 10th	Night	7% 1 16% 43% 31% 2	615
	11th to 20th	Night	5% 2 16% 47% 26% 4	612
	21st to end	Night	6% 2 13% 44% 30% 4	690
August	1st to 10th	Night	5% 1 19% 47% 27% 1	627
	11th to 20th	Night	7% 2 17% 48% 24% 2	624
	21st to end	Night	5% 1 18% 41% 31% 3	693
September	1st to 10th	Night	11% 2 16% 44% 25% 2	630
	11th to 20th	Night	11% 3 17% 42% 24% 3	609
	21st to end	Night	11% 5% 23% 38% 21% 3	600
October	1st to 10th	Night	8% 4 30% 36% 20% 2	794
	11th to 20th	Night	14% 9% 40% 30% 8% 1	800
	21st to end	Night	20% 12% 35% 24% 8% 1	880
November	1st to 10th	Night	14% 11% 43% 24% 9%	820
	11th to 20th	Night	15% 16% 38% 24% 8%	956
	21st to end	Night	20% 15% 36% 22% 7%	1050
December	1st to 10th	Night	17% 15% 41% 22% 4	1050
	11th to 20th	Night	20% 16% 37% 24% 3	1050
	21st to end	Night	18% 20% 37% 22% 3	1155

Page generated at 2026-09-11 03:11:52. Version ac07

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