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 2025-03-12.

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% 3 6% 4 4 4 3 5% 7% 46%	108687
	Night	11% 7% 2 6% 4 3 3 3 5% 6% 49%	110464
Transparency	Day	37% 5% 11% 25% 18% 4	112337
	Night	35% 4 10% 26% 20% 5%	114954
Seeing	Day	15% 9% 27% 28% 17% 5%	15922
	Night	14% 10% 32% 31% 12% 1	25939

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	17% 11% 4 6% 4 3 3 2 3 5% 41%	4077
	11th to 20th	Day	8% 9% 3 9% 5% 4 4 3 4 5% 46%	4080
	21st to end	Day	17% 11% 3 6% 3 3 3 3 4 5% 44%	4488
February	1st to 10th	Day	16% 13% 3 6% 5% 3 3 2 5% 5% 38%	1800
	11th to 20th	Day	14% 9% 4 7% 4 3 4 3 5% 5% 43%	1754
	21st to end	Day	15% 10% 3 7% 4 4 4 3 6% 6% 40%	1765
March	1st to 10th	Day	14% 9% 2 5% 3 3 3 3 4 5% 48%	3546
	11th to 20th	Day	13% 8% 2 4 3 3 4 3 4 7% 50%	3491
	21st to end	Day	16% 12% 4 6% 4 5% 4 3 5% 6% 34%	3814
April	1st to 10th	Day	12% 7% 2 6% 5% 4 4 4 6% 7% 45%	2196
	11th to 20th	Day	15% 8% 2 6% 4 5% 4 4 5% 6% 40%	2254
	21st to end	Day	21% 8% 3 6% 4 4 4 3 4 5% 38%	2324
May	1st to 10th	Day	21% 9% 3 6% 5% 4 4 4 5% 6% 35%	4082
	11th to 20th	Day	13% 7% 3 7% 4 5% 4 4 6% 7% 40%	4082
	21st to end	Day	14% 6% 3 6% 6% 5% 5% 4 6% 8% 38%	4477
June	1st to 10th	Day	8% 4 2 4 4 5% 5% 4 6% 11% 47%	2473
	11th to 20th	Day	7% 4 2 5% 4 4 4 4 6% 10% 50%	2566
	21st to end	Day	5% 2 1 3 4 3 5% 5% 7% 10% 56%	2470
July	1st to 10th	Day	10% 5% 2 5% 4 5% 5% 4 7% 9% 42%	4120
	11th to 20th	Day	5% 4 2 5% 4 4 5% 4 7% 10% 51%	4120
	21st to end	Day	6% 4 2 5% 4 4 5% 5% 9% 11% 45%	4465
August	1st to 10th	Day	5% 3 2 4 3 3 4 4 5% 9% 57%	4104
	11th to 20th	Day	7% 5% 2 6% 5% 5% 5% 4 6% 9% 45%	4041
	21st to end	Day	5% 4 2 4 3 4 4 4 6% 8% 56%	4180
September	1st to 10th	Day	11% 5% 2 6% 4 3 3 3 5% 6% 53%	2280
	11th to 20th	Day	10% 5% 3 6% 4 4 5% 3 5% 8% 47%	2121
	21st to end	Day	8% 4 2 5% 4 4 4 4 5% 7% 54%	2066
October	1st to 10th	Day	11% 4 2 4 3 3 4 2 5% 6% 56%	1900
	11th to 20th	Day	13% 5% 2 4 2 2 3 2 4 6% 56%	1900
	21st to end	Day	18% 6% 2 5% 2 3 3 2 4 4 50%	2090
November	1st to 10th	Day	12% 5% 2 5% 3 3 2 3 4 6% 56%	1958
	11th to 20th	Day	14% 7% 2 3 3 3 3 2 5% 5% 53%	1900
	21st to end	Day	14% 8% 3 5% 3 2 2 2 3 7% 50%	1615
December	1st to 10th	Day	10% 8% 2 5% 3 3 3 3 4 5% 54%	2610
	11th to 20th	Day	10% 10% 3 6% 4 3 3 2 3 5% 52%	3008
	21st to end	Day	20% 20% 5% 8% 4 3 3 2 3 4 27%	4470
January	1st to 10th	Night	14% 9% 3 10% 5% 4 3 2 4 6% 40%	5888
	11th to 20th	Night	8% 7% 3 9% 6% 4 4 3 4 5% 48%	5900
	21st to end	Night	17% 10% 4 7% 3 2 2 2 3 5% 46%	6490
February	1st to 10th	Night	16% 11% 3 6% 3 3 3 3 4 6% 42%	2600
	11th to 20th	Night	14% 9% 3 7% 4 3 3 3 4 5% 44%	2533
	21st to end	Night	13% 8% 2 6% 5% 3 3 3 5% 5% 47%	1879
March	1st to 10th	Night	15% 8% 3 5% 3 3 3 3 4 5% 47%	3529
	11th to 20th	Night	12% 6% 2 5% 3 3 4 3 4 5% 53%	3497
	21st to end	Night	13% 7% 3 6% 5% 4 5% 3 5% 7% 43%	3817
April	1st to 10th	Night	10% 6% 2 5% 3 3 3 3 5% 7% 51%	1982
	11th to 20th	Night	13% 7% 2 5% 3 3 3 3 4 7% 48%	1875
	21st to end	Night	17% 7% 2 6% 3 3 4 4 5% 6% 42%	1853
May	1st to 10th	Night	14% 8% 2 5% 4 4 4 3 5% 7% 44%	2823
	11th to 20th	Night	15% 7% 2 7% 4 4 4 3 5% 8% 42%	2823
	21st to end	Night	10% 6% 2 5% 5% 4 4 4 6% 9% 45%	3090
June	1st to 10th	Night	7% 3 2 4 4 3 4 3 6% 9% 54%	1678
	11th to 20th	Night	4 2 2 4 3 3 5% 4 8% 10% 56%	1584
	21st to end	Night	3 3 1 4 3 3 4 4 6% 10% 59%	1710
July	1st to 10th	Night	9% 4 2 6% 3 4 4 4 6% 8% 49%	2850
	11th to 20th	Night	3 2 1 4 4 4 3 4 5% 9% 60%	2850
	21st to end	Night	6% 4 2 4 4 4 4 4 6% 11% 53%	3098
August	1st to 10th	Night	3 2 1 4 3 3 4 3 6% 8% 63%	2836
	11th to 20th	Night	7% 4 2 6% 3 4 4 3 6% 9% 51%	2798
	21st to end	Night	2 3 1 4 3 3 4 3 6% 8% 62%	3476
September	1st to 10th	Night	9% 5% 2 4 3 3 3 3 5% 7% 57%	1900
	11th to 20th	Night	9% 5% 2 6% 4 3 4 3 5% 8% 52%	2055
	21st to end	Night	7% 4 2 5% 4 3 3 3 5% 6% 57%	2095
October	1st to 10th	Night	7% 4 1 3 3 2 3 3 4 7% 62%	2280
	11th to 20th	Night	14% 4 1 4 2 3 3 3 4 5% 57%	2280
	21st to end	Night	14% 7% 2 4 3 2 3 2 4 5% 53%	2508
November	1st to 10th	Night	12% 5% 2 4 1 2 2 2 3 5% 61%	2340
	11th to 20th	Night	12% 6% 2 5% 3 3 4 3 4 6% 54%	2498
	21st to end	Night	15% 7% 2 4 3 3 3 2 4 6% 52%	2780
December	1st to 10th	Night	9% 8% 2 5% 3 3 3 3 4 6% 53%	4580
	11th to 20th	Night	15% 8% 3 6% 3 3 3 2 3 5% 50%	5199
	21st to end	Night	18% 16% 5% 9% 4 4 3 3 4 4 31%	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	48% 2 9% 24% 16% 2	4078
	11th to 20th	Day	40% 3 10% 24% 17% 5%	4080
	21st to end	Day	44% 3 8% 20% 19% 7%	4488
February	1st to 10th	Day	48% 5% 10% 23% 12% 2	1800
	11th to 20th	Day	44% 4 10% 22% 16% 4	1763
	21st to end	Day	44% 4 7% 22% 16% 8%	1765
March	1st to 10th	Day	38% 4 7% 22% 20% 8%	3546
	11th to 20th	Day	34% 6% 12% 26% 18% 4	3491
	21st to end	Day	49% 7% 12% 23% 8% 1	3814
April	1st to 10th	Day	37% 7% 12% 24% 17% 3	2196
	11th to 20th	Day	43% 6% 13% 19% 17% 3	2254
	21st to end	Day	48% 6% 10% 23% 12% 1	2324
May	1st to 10th	Day	48% 7% 10% 20% 13% 1	4120
	11th to 20th	Day	40% 10% 13% 24% 13%	4086
	21st to end	Day	41% 10% 14% 22% 12% 1	4489
June	1st to 10th	Day	30% 9% 17% 27% 15% 2	2473
	11th to 20th	Day	30% 7% 14% 30% 17% 2	2566
	21st to end	Day	23% 8% 16% 31% 19% 4	2470
July	1st to 10th	Day	37% 6% 17% 23% 15% 3	4056
	11th to 20th	Day	28% 6% 13% 35% 18% 2	4051
	21st to end	Day	30% 5% 24% 30% 10%	4325
August	1st to 10th	Day	23% 6% 17% 27% 24% 3	4090
	11th to 20th	Day	36% 6% 16% 26% 16% 1	4080
	21st to end	Day	27% 6% 11% 40% 14% 3	4179
September	1st to 10th	Day	32% 6% 12% 25% 16% 9%	2280
	11th to 20th	Day	36% 5% 10% 23% 23% 3	2121
	21st to end	Day	29% 7% 10% 25% 24% 5%	2066
October	1st to 10th	Day	18% 3 7% 17% 37% 18%	3160
	11th to 20th	Day	19% 2 5% 24% 35% 14%	3140
	21st to end	Day	29% 3 7% 31% 26% 5%	3428
November	1st to 10th	Day	30% 3 11% 28% 23% 6%	1958
	11th to 20th	Day	34% 4 7% 23% 23% 8%	1900
	21st to end	Day	38% 4 9% 24% 24% 2	1615
December	1st to 10th	Day	35% 3 7% 34% 20% 1	2610
	11th to 20th	Day	37% 2 6% 28% 24% 2	3005
	21st to end	Day	62% 3 7% 19% 8% 1	4470
January	1st to 10th	Night	47% 3 11% 23% 14% 2	5888
	11th to 20th	Night	39% 3 9% 22% 23% 3	5900
	21st to end	Night	45% 2 8% 19% 21% 5%	6490
February	1st to 10th	Night	44% 5% 12% 23% 14% 4	2600
	11th to 20th	Night	43% 3 8% 24% 17% 4	2534
	21st to end	Night	40% 4 8% 21% 22% 6%	1879
March	1st to 10th	Night	39% 5% 10% 18% 20% 7%	3529
	11th to 20th	Night	34% 6% 9% 26% 21% 4	3497
	21st to end	Night	41% 7% 13% 28% 10% 1	3817
April	1st to 10th	Night	33% 5% 12% 23% 21% 6%	1982
	11th to 20th	Night	37% 5% 9% 23% 21% 5%	1875
	21st to end	Night	42% 6% 11% 22% 17% 1	1853
May	1st to 10th	Night	39% 7% 12% 21% 16% 4	2850
	11th to 20th	Night	40% 8% 12% 25% 13% 1	2824
	21st to end	Night	33% 9% 15% 30% 13% 1	3099
June	1st to 10th	Night	26% 8% 16% 30% 16% 4	1678
	11th to 20th	Night	21% 8% 16% 31% 21% 3	1584
	21st to end	Night	20% 5% 17% 33% 21% 5%	1710
July	1st to 10th	Night	31% 6% 16% 25% 17% 5%	2805
	11th to 20th	Night	21% 5% 10% 40% 23% 2	2796
	21st to end	Night	25% 5% 21% 35% 14%	2999
August	1st to 10th	Night	19% 6% 15% 33% 24% 3	2826
	11th to 20th	Night	30% 5% 16% 30% 19% 1	2825
	21st to end	Night	20% 5% 12% 39% 20% 4	3476
September	1st to 10th	Night	27% 5% 12% 26% 21% 9%	1900
	11th to 20th	Night	31% 5% 9% 24% 25% 6%	2055
	21st to end	Night	28% 5% 9% 25% 30% 5%	2095
October	1st to 10th	Night	14% 3 6% 17% 41% 19%	3800
	11th to 20th	Night	21% 3 5% 20% 33% 19%	3779
	21st to end	Night	30% 3 6% 31% 25% 5%	4120
November	1st to 10th	Night	28% 3 9% 26% 26% 8%	2340
	11th to 20th	Night	33% 4 6% 25% 26% 7%	2498
	21st to end	Night	36% 3 8% 24% 24% 4	2780
December	1st to 10th	Night	34% 3 9% 35% 17% 1	4580
	11th to 20th	Night	40% 2 6% 24% 23% 3	5201
	21st to end	Night	57% 4 9% 20% 9% 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	20% 16% 39% 22% 3	300
	11th to 20th	Day	25% 17% 41% 15% 2	300
	21st to end	Day	17% 16% 47% 16% 5%	330
February	1st to 10th	Day	27% 18% 37% 16% 2	300
	11th to 20th	Day	21% 23% 40% 13% 3	300
	21st to end	Day	26% 18% 39% 15% 2	249
March	1st to 10th	Day	20% 19% 36% 22% 3	300
	11th to 20th	Day	26% 17% 32% 23% 3	273
	21st to end	Day	28% 19% 37% 11% 4 1	297
April	1st to 10th	Day	18% 20% 36% 21% 4 1	376
	11th to 20th	Day	21% 17% 38% 18% 5%	452
	21st to end	Day	24% 15% 32% 24% 6% 1	504
May	1st to 10th	Day	19% 13% 37% 23% 8% 1	653
	11th to 20th	Day	15% 9% 31% 28% 14% 3	675
	21st to end	Day	15% 7% 31% 25% 16% 6%	734
June	1st to 10th	Day	8% 4 19% 36% 24% 9%	680
	11th to 20th	Day	6% 4 21% 40% 23% 6%	680
	21st to end	Day	5% 3 28% 39% 21% 5%	680
July	1st to 10th	Day	11% 2 15% 32% 30% 11%	671
	11th to 20th	Day	4 2 15% 37% 32% 9%	668
	21st to end	Day	9% 1 12% 34% 32% 13%	739
August	1st to 10th	Day	9% 2 13% 42% 29% 6%	676
	11th to 20th	Day	9% 2 17% 35% 31% 6%	665
	21st to end	Day	9% 2 11% 29% 37% 12%	539
September	1st to 10th	Day	10% 3 10% 36% 32% 9%	490
	11th to 20th	Day	7% 2 18% 38% 25% 10%	331
	21st to end	Day	10% 5% 22% 36% 20% 7%	300
October	1st to 10th	Day	11% 7% 25% 30% 21% 7%	300
	11th to 20th	Day	14% 12% 37% 25% 11% 1	300
	21st to end	Day	26% 12% 31% 25% 5% 2	330
November	1st to 10th	Day	17% 10% 39% 23% 10% 2	300
	11th to 20th	Day	17% 16% 38% 20% 8% 2	300
	21st to end	Day	24% 14% 34% 22% 6%	300
December	1st to 10th	Day	17% 15% 44% 16% 7% 2	300
	11th to 20th	Day	20% 15% 42% 16% 7% 1	300
	21st to end	Day	23% 20% 36% 18% 2	330
January	1st to 10th	Night	16% 15% 40% 24% 5%	1000
	11th to 20th	Night	17% 17% 41% 20% 4	1000
	21st to end	Night	16% 14% 42% 25% 3	1100
February	1st to 10th	Night	22% 13% 40% 21% 3	1000
	11th to 20th	Night	20% 17% 41% 20% 2	979
	21st to end	Night	19% 20% 36% 22% 2	559
March	1st to 10th	Night	17% 14% 40% 24% 4	600
	11th to 20th	Night	22% 12% 39% 23% 3	575
	21st to end	Night	20% 14% 40% 21% 5%	627
April	1st to 10th	Night	14% 13% 40% 29% 4	570
	11th to 20th	Night	17% 13% 34% 29% 6%	563
	21st to end	Night	20% 11% 39% 22% 7%	570
May	1st to 10th	Night	14% 7% 39% 33% 6%	570
	11th to 20th	Night	15% 5% 29% 33% 17% 1	561
	21st to end	Night	10% 5% 32% 35% 17% 1	617
June	1st to 10th	Night	7% 3 17% 46% 26% 1	570
	11th to 20th	Night	5% 2 24% 46% 22% 1	570
	21st to end	Night	3 2 24% 51% 20% 1	570
July	1st to 10th	Night	7% 1 13% 40% 37% 3	555
	11th to 20th	Night	4 1 12% 45% 34% 4	552
	21st to end	Night	7% 1 11% 43% 34% 3	624
August	1st to 10th	Night	6% 2 14% 44% 34% 1	567
	11th to 20th	Night	6% 2 12% 50% 26% 3	564
	21st to end	Night	4 1 13% 39% 39% 4	627
September	1st to 10th	Night	10% 2 14% 42% 31% 2	570
	11th to 20th	Night	10% 3 14% 45% 25% 4	570
	21st to end	Night	10% 4 20% 43% 20% 3	575
October	1st to 10th	Night	9% 3 27% 38% 21% 3	760
	11th to 20th	Night	15% 7% 37% 31% 9% 1	760
	21st to end	Night	19% 10% 33% 29% 9% 1	836
November	1st to 10th	Night	14% 8% 42% 27% 9% 1	780
	11th to 20th	Night	15% 14% 37% 26% 7%	898
	21st to end	Night	20% 11% 37% 24% 8%	1000
December	1st to 10th	Night	18% 13% 38% 26% 5%	1000
	11th to 20th	Night	20% 13% 36% 26% 4	1000
	21st to end	Night	19% 15% 40% 23% 3	1100

Page generated at 2025-03-09 07:08:44. Version ac07

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