Carthage
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Carthage clear sky chart from 2005-11-06 to 2026-07-16.

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	12% 7% 2 6% 4 4 4 3 5% 7% 46%	137377
	Night	11% 7% 2 6% 4 3 4 3 5% 7% 49%	135560
Transparency	Day	37% 5% 11% 26% 18% 4	140988
	Night	35% 4 10% 26% 20% 5%	140029
Seeing	Day	15% 9% 28% 28% 16% 4	17851
	Night	14% 9% 32% 31% 12% 1	27653

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	15% 10% 3 6% 4 4 4 2 4 6% 43%	5289
	11th to 20th	Day	6% 9% 3 8% 5% 4 4 3 3 6% 49%	5310
	21st to end	Day	15% 11% 3 6% 3 3 3 2 4 4 46%	5812
February	1st to 10th	Day	15% 12% 2 6% 5% 3 3 2 5% 5% 39%	1890
	11th to 20th	Day	14% 9% 3 7% 4 4 4 2 5% 5% 44%	1844
	21st to end	Day	14% 10% 3 7% 4 4 3 3 6% 6% 42%	1851
March	1st to 10th	Day	12% 9% 2 5% 3 3 3 3 4 5% 49%	5046
	11th to 20th	Day	10% 7% 2 4 3 3 4 3 4 7% 54%	5090
	21st to end	Day	12% 10% 4 7% 5% 5% 5% 4 6% 7% 35%	5583
April	1st to 10th	Day	13% 7% 2 6% 5% 3 4 3 6% 7% 45%	2428
	11th to 20th	Day	15% 8% 2 6% 4 5% 4 4 5% 6% 41%	2494
	21st to end	Day	20% 8% 3 7% 4 4 4 3 5% 6% 36%	2569
May	1st to 10th	Day	17% 7% 2 6% 4 4 4 4 5% 7% 40%	7617
	11th to 20th	Day	12% 6% 2 6% 4 4 5% 4 6% 7% 43%	7627
	21st to end	Day	21% 7% 3 6% 5% 4 4 4 5% 7% 33%	8392
June	1st to 10th	Day	8% 4 2 5% 4 5% 5% 4 6% 10% 47%	2733
	11th to 20th	Day	8% 4 2 5% 5% 4 4 4 6% 9% 48%	2835
	21st to end	Day	6% 3 1 4 4 3 5% 5% 6% 10% 54%	2730
July	1st to 10th	Day	8% 5% 2 6% 4 5% 6% 5% 8% 10% 44%	6030
	11th to 20th	Day	6% 5% 2 6% 5% 5% 5% 4 6% 10% 46%	5966
	21st to end	Day	5% 3 2 4 4 4 5% 4 8% 11% 50%	6422
August	1st to 10th	Day	5% 3 2 4 3 3 4 4 5% 9% 57%	4234
	11th to 20th	Day	7% 5% 2 6% 5% 5% 5% 4 6% 9% 46%	4171
	21st to end	Day	6% 4 2 5% 3 4 4 4 6% 8% 55%	4312
September	1st to 10th	Day	11% 5% 2 6% 4 3 3 3 5% 6% 52%	2400
	11th to 20th	Day	10% 5% 2 6% 4 4 5% 3 6% 8% 46%	2232
	21st to end	Day	8% 4 2 5% 4 3 4 4 5% 7% 53%	2174
October	1st to 10th	Day	11% 4 2 4 3 4 4 2 5% 6% 55%	2000
	11th to 20th	Day	13% 5% 2 4 2 3 3 2 4 6% 56%	2000
	21st to end	Day	19% 6% 2 5% 2 2 3 2 4 4 50%	2200
November	1st to 10th	Day	11% 5% 2 5% 3 3 2 3 4 6% 57%	2058
	11th to 20th	Day	13% 7% 2 3 3 4 3 2 5% 6% 52%	1995
	21st to end	Day	15% 9% 3 5% 3 2 2 2 4 7% 49%	1696
December	1st to 10th	Day	10% 8% 2 5% 3 3 3 3 4 5% 54%	2690
	11th to 20th	Day	10% 9% 2 6% 4 3 3 2 3 6% 52%	3088
	21st to end	Day	19% 20% 5% 8% 4 3 3 2 3 4 28%	4569
January	1st to 10th	Night	13% 10% 3 9% 5% 3 3 2 3 5% 43%	7634
	11th to 20th	Night	7% 6% 2 8% 5% 4 4 3 4 5% 53%	7680
	21st to end	Night	16% 9% 3 6% 3 4 3 3 4 5% 45%	8402
February	1st to 10th	Night	15% 10% 3 6% 3 3 3 3 5% 6% 44%	2730
	11th to 20th	Night	15% 9% 3 6% 4 3 3 3 4 5% 45%	2663
	21st to end	Night	13% 7% 2 6% 5% 3 3 3 5% 5% 47%	1970
March	1st to 10th	Night	14% 10% 3 6% 3 3 3 3 3 5% 47%	5029
	11th to 20th	Night	10% 6% 2 4 3 3 3 3 4 6% 56%	5090
	21st to end	Night	10% 6% 3 6% 4 4 5% 3 5% 8% 46%	5588
April	1st to 10th	Night	11% 6% 2 5% 3 3 3 3 5% 7% 51%	2190
	11th to 20th	Night	14% 7% 2 5% 3 3 3 3 4 7% 48%	2075
	21st to end	Night	17% 7% 2 6% 3 3 4 4 5% 6% 42%	2047
May	1st to 10th	Night	13% 7% 2 6% 4 4 4 3 5% 6% 46%	5266
	11th to 20th	Night	13% 5% 2 6% 4 4 4 3 6% 9% 44%	5265
	21st to end	Night	18% 8% 3 6% 4 3 4 3 5% 8% 38%	5793
June	1st to 10th	Night	7% 4 2 4 4 4 4 3 6% 9% 52%	1855
	11th to 20th	Night	6% 3 2 4 3 3 5% 4 7% 10% 54%	1752
	21st to end	Night	4 3 2 4 3 3 4 4 6% 10% 59%	1890
July	1st to 10th	Night	8% 4 2 6% 4 4 5% 4 6% 10% 48%	4168
	11th to 20th	Night	4 3 2 5% 4 4 4 4 5% 9% 57%	4122
	21st to end	Night	4 3 1 3 3 4 4 4 7% 12% 54%	4449
August	1st to 10th	Night	3 2 1 4 3 3 4 4 6% 9% 63%	2926
	11th to 20th	Night	7% 4 2 6% 3 4 4 3 6% 9% 51%	2888
	21st to end	Night	2 3 1 4 3 3 4 3 6% 9% 62%	3586
September	1st to 10th	Night	10% 5% 2 4 3 3 3 3 5% 7% 56%	2000
	11th to 20th	Night	9% 5% 2 6% 4 3 4 3 5% 9% 51%	2163
	21st to end	Night	8% 4 2 5% 4 3 4 3 5% 6% 57%	2205
October	1st to 10th	Night	7% 4 1 3 3 2 3 3 4 7% 63%	2400
	11th to 20th	Night	13% 5% 1 4 2 3 4 3 4 5% 56%	2400
	21st to end	Night	15% 7% 2 4 3 2 3 2 4 4 52%	2640
November	1st to 10th	Night	12% 5% 2 4 1 2 2 2 3 5% 61%	2460
	11th to 20th	Night	11% 6% 2 5% 3 3 4 3 4 6% 55%	2623
	21st to end	Night	16% 7% 2 4 3 3 3 2 4 6% 51%	2919
December	1st to 10th	Night	9% 8% 3 6% 3 3 3 3 4 6% 52%	4720
	11th to 20th	Night	15% 7% 3 6% 3 3 3 2 3 5% 50%	5339
	21st to end	Night	17% 16% 5% 9% 4 4 3 3 4 4 32%	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	38% 3 8% 28% 18% 6%	5310
	21st to end	Day	43% 2 7% 21% 20% 6%	5812
February	1st to 10th	Day	47% 5% 10% 24% 12% 2	1890
	11th to 20th	Day	44% 4 10% 23% 16% 4	1853
	21st to end	Day	43% 4 7% 21% 18% 8%	1851
March	1st to 10th	Day	38% 3 7% 22% 17% 13%	5046
	11th to 20th	Day	30% 5% 9% 21% 24% 11%	5090
	21st to end	Day	47% 6% 12% 27% 8% 1	5585
April	1st to 10th	Day	38% 6% 12% 24% 17% 3	2428
	11th to 20th	Day	43% 5% 13% 19% 17% 3	2494
	21st to end	Day	48% 6% 10% 23% 11% 1	2569
May	1st to 10th	Day	43% 5% 10% 25% 16% 1	7655
	11th to 20th	Day	39% 6% 11% 24% 18% 2	7631
	21st to end	Day	49% 6% 13% 18% 13% 1	8405
June	1st to 10th	Day	31% 8% 17% 26% 16% 2	2733
	11th to 20th	Day	32% 7% 14% 29% 16% 2	2835
	21st to end	Day	24% 7% 16% 30% 18% 4	2730
July	1st to 10th	Day	34% 5% 16% 24% 19% 2	5966
	11th to 20th	Day	33% 5% 14% 33% 14% 1	5897
	21st to end	Day	26% 4 22% 36% 11%	6240
August	1st to 10th	Day	23% 6% 17% 28% 24% 3	4220
	11th to 20th	Day	35% 6% 16% 27% 16% 1	4210
	21st to end	Day	28% 5% 11% 39% 14% 3	4311
September	1st to 10th	Day	33% 5% 12% 25% 16% 9%	2400
	11th to 20th	Day	36% 5% 11% 23% 22% 3	2232
	21st to end	Day	29% 6% 10% 25% 25% 5%	2174
October	1st to 10th	Day	18% 3 7% 17% 38% 17%	3260
	11th to 20th	Day	19% 2 5% 25% 35% 14%	3240
	21st to end	Day	30% 2 7% 31% 25% 5%	3538
November	1st to 10th	Day	29% 3 10% 29% 23% 6%	2058
	11th to 20th	Day	34% 4 8% 24% 23% 8%	1995
	21st to end	Day	38% 4 10% 24% 23% 2	1696
December	1st to 10th	Day	35% 3 7% 34% 19% 1	2690
	11th to 20th	Day	37% 2 6% 29% 24% 2	3085
	21st to end	Day	61% 3 7% 20% 8% 1	4569
January	1st to 10th	Night	45% 2 10% 27% 14% 2	7635
	11th to 20th	Night	34% 3 7% 24% 27% 4	7680
	21st to end	Night	45% 2 9% 19% 21% 4	8402
February	1st to 10th	Night	43% 4 11% 24% 14% 4	2730
	11th to 20th	Night	43% 3 9% 25% 17% 4	2664
	21st to end	Night	39% 4 8% 21% 22% 7%	1970
March	1st to 10th	Night	42% 4 7% 18% 23% 6%	5029
	11th to 20th	Night	30% 4 7% 23% 24% 11%	5090
	21st to end	Night	37% 6% 13% 30% 14% 1	5588
April	1st to 10th	Night	34% 5% 12% 24% 20% 6%	2190
	11th to 20th	Night	37% 4 10% 23% 21% 5%	2075
	21st to end	Night	41% 6% 12% 24% 16% 1	2047
May	1st to 10th	Night	39% 5% 12% 27% 16% 2	5293
	11th to 20th	Night	37% 5% 13% 24% 16% 5%	5266
	21st to end	Night	45% 6% 13% 23% 11% 2	5805
June	1st to 10th	Night	28% 8% 16% 29% 16% 4	1855
	11th to 20th	Night	23% 8% 16% 30% 20% 3	1752
	21st to end	Night	21% 5% 17% 33% 20% 4	1890
July	1st to 10th	Night	31% 5% 15% 25% 19% 4	4125
	11th to 20th	Night	25% 5% 11% 41% 17% 2	4071
	21st to end	Night	22% 5% 20% 37% 17%	4320
August	1st to 10th	Night	19% 6% 15% 33% 24% 3	2916
	11th to 20th	Night	29% 5% 16% 30% 19% 1	2915
	21st to end	Night	20% 5% 12% 38% 20% 5%	3586
September	1st to 10th	Night	28% 5% 11% 26% 21% 9%	2000
	11th to 20th	Night	31% 5% 10% 25% 24% 5%	2163
	21st to end	Night	28% 4 9% 24% 30% 4	2205
October	1st to 10th	Night	14% 3 6% 17% 41% 19%	3920
	11th to 20th	Night	22% 3 5% 20% 32% 19%	3899
	21st to end	Night	31% 3 6% 30% 26% 5%	4252
November	1st to 10th	Night	28% 3 9% 26% 26% 8%	2460
	11th to 20th	Night	32% 4 6% 27% 25% 7%	2623
	21st to end	Night	37% 3 8% 24% 23% 4	2919
December	1st to 10th	Night	34% 3 10% 35% 17% 1	4720
	11th to 20th	Night	40% 2 7% 24% 24% 3	5341
	21st to end	Night	56% 4 9% 21% 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	19% 16% 38% 23% 4	330
	11th to 20th	Day	23% 18% 42% 15% 2	330
	21st to end	Day	16% 17% 48% 15% 4	363
February	1st to 10th	Day	24% 18% 38% 17% 2	330
	11th to 20th	Day	22% 21% 41% 14% 3	330
	21st to end	Day	25% 19% 38% 16% 1	273
March	1st to 10th	Day	22% 19% 36% 20% 3	330
	11th to 20th	Day	26% 17% 34% 20% 2	330
	21st to end	Day	28% 17% 40% 11% 4 1	363
April	1st to 10th	Day	21% 20% 34% 21% 4	448
	11th to 20th	Day	22% 18% 39% 17% 5%	532
	21st to end	Day	24% 15% 31% 25% 5% 1	589
May	1st to 10th	Day	18% 12% 37% 24% 8% 1	753
	11th to 20th	Day	16% 10% 32% 27% 13% 3	775
	21st to end	Day	17% 7% 30% 26% 15% 5%	844
June	1st to 10th	Day	9% 5% 21% 34% 23% 8%	780
	11th to 20th	Day	7% 4 22% 38% 22% 6%	780
	21st to end	Day	6% 3 28% 38% 21% 4	780
July	1st to 10th	Day	10% 2 14% 33% 30% 11%	771
	11th to 20th	Day	5% 2 15% 37% 32% 8%	744
	21st to end	Day	8% 2 12% 35% 31% 13%	794
August	1st to 10th	Day	8% 2 13% 43% 28% 5%	726
	11th to 20th	Day	8% 2 16% 34% 32% 7%	715
	21st to end	Day	10% 2 12% 29% 36% 11%	583
September	1st to 10th	Day	10% 3 10% 36% 32% 9%	530
	11th to 20th	Day	8% 1 17% 38% 25% 11%	362
	21st to end	Day	11% 5% 21% 34% 21% 8%	330
October	1st to 10th	Day	10% 6% 25% 32% 20% 7%	330
	11th to 20th	Day	14% 11% 38% 25% 11% 2	330
	21st to end	Day	27% 12% 30% 25% 4 1	363
November	1st to 10th	Day	15% 10% 41% 23% 9% 2	330
	11th to 20th	Day	16% 16% 39% 20% 7% 2	330
	21st to end	Day	24% 15% 34% 21% 7%	330
December	1st to 10th	Day	18% 15% 43% 15% 8% 2	330
	11th to 20th	Day	19% 15% 42% 17% 6% 1	330
	21st to end	Day	22% 19% 37% 20% 2	363
January	1st to 10th	Night	17% 15% 39% 24% 5%	1050
	11th to 20th	Night	16% 17% 43% 20% 4	1050
	21st to end	Night	16% 14% 42% 24% 3	1155
February	1st to 10th	Night	21% 13% 41% 22% 3	1050
	11th to 20th	Night	20% 17% 41% 19% 2	1029
	21st to end	Night	19% 19% 37% 22% 3	586
March	1st to 10th	Night	18% 14% 40% 24% 4	630
	11th to 20th	Night	22% 12% 40% 23% 3	630
	21st to end	Night	19% 14% 42% 21% 4	693
April	1st to 10th	Night	15% 13% 39% 30% 3	630
	11th to 20th	Night	18% 13% 36% 28% 5%	623
	21st to end	Night	20% 11% 39% 23% 7%	630
May	1st to 10th	Night	14% 7% 37% 34% 7%	630
	11th to 20th	Night	15% 6% 29% 32% 16% 1	621
	21st to end	Night	12% 5% 30% 34% 17% 1	683
June	1st to 10th	Night	8% 3 18% 45% 24% 1	630
	11th to 20th	Night	7% 3 23% 45% 21% 1	630
	21st to end	Night	4 2 24% 50% 20% 1	630
July	1st to 10th	Night	6% 1 13% 40% 37% 3	615
	11th to 20th	Night	5% 2 12% 45% 33% 4	597
	21st to end	Night	7% 1 11% 43% 34% 4	657
August	1st to 10th	Night	6% 2 14% 45% 32% 1	597
	11th to 20th	Night	6% 2 12% 48% 28% 4	594
	21st to end	Night	4 1 13% 40% 38% 4	660
September	1st to 10th	Night	12% 2 13% 42% 30% 2	600
	11th to 20th	Night	10% 3 13% 44% 27% 4	600
	21st to end	Night	10% 4 20% 43% 21% 3	605
October	1st to 10th	Night	8% 3 26% 39% 21% 3	800
	11th to 20th	Night	14% 7% 37% 31% 10% 1	800
	21st to end	Night	20% 10% 33% 28% 8% 1	880
November	1st to 10th	Night	13% 8% 42% 27% 9% 1	820
	11th to 20th	Night	15% 14% 38% 27% 7%	943
	21st to end	Night	21% 12% 36% 23% 7%	1050
December	1st to 10th	Night	18% 14% 38% 26% 5%	1050
	11th to 20th	Night	20% 13% 37% 26% 4	1050
	21st to end	Night	19% 15% 40% 23% 3	1155

Page generated at 2026-07-13 02:14:54. Version ac07

Copyright © 2026 Attilla Danko.