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 2024-02-10.

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	13% 7% 3 5% 5% 3 4 4 5% 7% 45%	78223
	Night	12% 7% 3 5% 4 2 4 4 4 7% 48%	80732
Transparency	Day	39% 6% 12% 24% 16% 3	77946
	Night	36% 5% 11% 25% 19% 4	80529
Seeing	Day	15% 9% 27% 28% 17% 5%	14459
	Night	14% 9% 32% 31% 13% 1	24483

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% 11% 4 5% 5% 3 3 3 4 5% 43%	2847
	11th to 20th	Day	10% 10% 3 7% 6% 2 4 4 4 6% 44%	2850
	21st to end	Day	20% 12% 3 6% 3 2 3 3 3 5% 40%	3135
February	1st to 10th	Day	15% 12% 3 5% 6% 2 4 3 4 5% 40%	1701
	11th to 20th	Day	13% 7% 5% 7% 5% 2 4 3 5% 5% 43%	1574
	21st to end	Day	16% 10% 3 6% 4 3 4 3 5% 6% 38%	1583
March	1st to 10th	Day	12% 9% 4 5% 4 2 4 4 4 5% 45%	1980
	11th to 20th	Day	21% 10% 4 6% 4 3 3 5% 4 5% 38%	1980
	21st to end	Day	20% 11% 4 6% 5% 3 4 3 5% 6% 32%	2178
April	1st to 10th	Day	12% 6% 3 5% 5% 3 4 5% 5% 8% 45%	2080
	11th to 20th	Day	16% 8% 2 5% 4 4 4 5% 5% 7% 40%	2134
	21st to end	Day	21% 7% 3 6% 5% 3 4 4 4 5% 38%	2201
May	1st to 10th	Day	20% 7% 3 5% 5% 3 4 5% 5% 6% 38%	2340
	11th to 20th	Day	14% 6% 3 6% 5% 4 5% 5% 6% 8% 39%	2302
	21st to end	Day	11% 6% 3 6% 7% 4 5% 6% 6% 9% 35%	2531
June	1st to 10th	Day	8% 4 2 4 4 3 5% 5% 6% 10% 48%	2343
	11th to 20th	Day	7% 4 2 5% 5% 3 5% 5% 6% 10% 48%	2432
	21st to end	Day	5% 2 1 3 4 3 4 6% 6% 10% 57%	2340
July	1st to 10th	Day	9% 4 3 5% 5% 4 6% 6% 7% 11% 41%	2340
	11th to 20th	Day	4 3 1 4 5% 3 5% 5% 7% 10% 54%	2340
	21st to end	Day	9% 4 3 4 5% 3 5% 5% 8% 9% 44%	2546
August	1st to 10th	Day	7% 4 2 5% 5% 3 5% 6% 7% 11% 46%	2328
	11th to 20th	Day	8% 5% 1 5% 6% 3 6% 6% 6% 8% 46%	2301
	21st to end	Day	6% 5% 2 4 5% 3 4 5% 5% 8% 53%	2376
September	1st to 10th	Day	11% 5% 2 5% 4 2 3 4 5% 6% 51%	2160
	11th to 20th	Day	10% 5% 2 6% 5% 2 5% 4 5% 7% 47%	2010
	21st to end	Day	8% 4 2 4 3 3 4 5% 5% 7% 55%	1958
October	1st to 10th	Day	12% 4 2 4 4 3 5% 3 5% 6% 54%	1800
	11th to 20th	Day	14% 5% 2 4 3 2 3 3 4 7% 54%	1800
	21st to end	Day	19% 6% 2 4 2 2 3 3 4 4 49%	1980
November	1st to 10th	Day	11% 4 2 4 3 2 2 3 4 7% 57%	1858
	11th to 20th	Day	13% 7% 2 3 3 3 3 3 4 5% 53%	1805
	21st to end	Day	15% 8% 3 5% 3 2 3 3 3 7% 50%	1535
December	1st to 10th	Day	13% 8% 3 5% 5% 2 4 3 4 6% 47%	1520
	11th to 20th	Day	12% 11% 3 6% 6% 3 3 3 3 6% 44%	1918
	21st to end	Day	16% 18% 6% 7% 5% 3 4 4 4 5% 28%	3117
January	1st to 10th	Night	11% 10% 4 8% 5% 2 3 3 4 5% 45%	4108
	11th to 20th	Night	10% 6% 2 7% 8% 3 4 4 4 5% 45%	4120
	21st to end	Night	22% 10% 4 6% 3 2 2 2 3 4 41%	4532
February	1st to 10th	Night	15% 10% 3 5% 4 2 3 4 4 6% 43%	2464
	11th to 20th	Night	14% 8% 4 6% 4 3 4 3 4 5% 45%	2273
	21st to end	Night	14% 8% 3 6% 5% 3 3 4 3 5% 45%	1686
March	1st to 10th	Night	14% 7% 3 5% 4 2 4 3 5% 7% 47%	1980
	11th to 20th	Night	17% 9% 2 5% 4 2 4 4 4 6% 42%	1980
	21st to end	Night	17% 7% 3 5% 5% 3 4 3 4 8% 39%	2178
April	1st to 10th	Night	10% 6% 2 4 4 2 4 4 5% 8% 52%	1878
	11th to 20th	Night	14% 7% 2 5% 4 2 4 4 4 7% 48%	1775
	21st to end	Night	18% 6% 3 5% 4 3 3 5% 5% 7% 42%	1756
May	1st to 10th	Night	14% 6% 2 5% 4 3 5% 4 5% 7% 45%	1620
	11th to 20th	Night	14% 6% 2 6% 4 2 4 3 4 8% 47%	1593
	21st to end	Night	10% 5% 3 5% 6% 3 4 5% 6% 10% 42%	1745
June	1st to 10th	Night	6% 3 2 4 4 3 4 4 6% 9% 54%	1590
	11th to 20th	Night	5% 2 2 3 4 2 4 5% 8% 10% 56%	1500
	21st to end	Night	3 2 1 4 3 2 4 5% 6% 10% 61%	1620
July	1st to 10th	Night	6% 3 2 4 5% 2 5% 7% 6% 11% 50%	1620
	11th to 20th	Night	4 2 1 3 4 2 5% 5% 5% 9% 61%	1620
	21st to end	Night	6% 4 2 3 5% 3 4 6% 6% 11% 49%	1772
August	1st to 10th	Night	6% 3 1 4 4 3 5% 5% 6% 10% 53%	1611
	11th to 20th	Night	6% 3 2 4 4 2 3 4 5% 10% 56%	1600
	21st to end	Night	3 3 2 4 5% 3 5% 4 7% 9% 57%	1980
September	1st to 10th	Night	9% 5% 2 4 3 2 4 3 4 7% 56%	1800
	11th to 20th	Night	9% 4 2 5% 5% 2 3 4 5% 8% 52%	1946
	21st to end	Night	7% 4 2 4 5% 2 3 4 5% 6% 58%	1984
October	1st to 10th	Night	8% 4 1 3 4 2 3 4 4 8% 61%	2160
	11th to 20th	Night	14% 4 2 3 3 2 3 4 4 6% 55%	2160
	21st to end	Night	15% 7% 3 4 4 2 3 3 4 4 52%	2376
November	1st to 10th	Night	11% 5% 2 3 2 2 3 3 3 5% 62%	2220
	11th to 20th	Night	12% 6% 2 4 4 3 4 3 4 5% 54%	2373
	21st to end	Night	16% 6% 2 3 4 2 3 3 3 6% 51%	2641
December	1st to 10th	Night	14% 7% 4 5% 4 2 3 5% 4 7% 46%	2660
	11th to 20th	Night	14% 8% 4 6% 5% 3 4 3 4 5% 44%	3279
	21st to end	Night	16% 16% 5% 7% 5% 3 4 3 4 5% 34%	4532

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 8% 25% 18% 1	2848
	11th to 20th	Day	41% 3 14% 26% 11% 5%	2850
	21st to end	Day	48% 4 8% 20% 16% 3	3135
February	1st to 10th	Day	47% 5% 10% 23% 12% 2	1701
	11th to 20th	Day	44% 4 10% 23% 15% 4	1583
	21st to end	Day	47% 4 7% 21% 14% 7%	1583
March	1st to 10th	Day	42% 4 9% 21% 19% 6%	1980
	11th to 20th	Day	49% 5% 10% 19% 14% 3	1980
	21st to end	Day	53% 5% 11% 20% 9% 1	2178
April	1st to 10th	Day	37% 7% 12% 25% 17% 2	2080
	11th to 20th	Day	44% 6% 13% 19% 15% 3	2134
	21st to end	Day	48% 6% 10% 23% 12% 1	2201
May	1st to 10th	Day	47% 6% 11% 22% 13% 1	2340
	11th to 20th	Day	43% 8% 13% 25% 12% 1	2306
	21st to end	Day	43% 10% 14% 22% 10%	2531
June	1st to 10th	Day	30% 9% 17% 27% 16% 2	2343
	11th to 20th	Day	31% 8% 15% 29% 15% 2	2432
	21st to end	Day	22% 8% 16% 31% 19% 4	2340
July	1st to 10th	Day	34% 9% 18% 24% 13% 2	2276
	11th to 20th	Day	24% 9% 15% 30% 20% 3	2271
	21st to end	Day	32% 8% 17% 30% 12% 1	2405
August	1st to 10th	Day	30% 11% 16% 26% 16% 1	2314
	11th to 20th	Day	33% 10% 10% 28% 18% 1	2301
	21st to end	Day	29% 7% 12% 26% 19% 6%	2376
September	1st to 10th	Day	33% 6% 12% 26% 16% 7%	2160
	11th to 20th	Day	36% 6% 10% 22% 24% 3	2010
	21st to end	Day	28% 7% 10% 26% 24% 5%	1958
October	1st to 10th	Day	31% 5% 12% 23% 24% 5%	1800
	11th to 20th	Day	32% 3 9% 27% 23% 7%	1800
	21st to end	Day	39% 4 8% 25% 17% 6%	1980
November	1st to 10th	Day	29% 3 11% 28% 23% 6%	1858
	11th to 20th	Day	34% 5% 8% 23% 24% 7%	1805
	21st to end	Day	38% 4 10% 22% 24% 2	1535
December	1st to 10th	Day	40% 5% 8% 31% 15% 1	1520
	11th to 20th	Day	45% 3 8% 19% 23% 2	1915
	21st to end	Day	57% 4 9% 17% 10% 1	3117
January	1st to 10th	Night	43% 4 9% 27% 16% 2	4108
	11th to 20th	Night	42% 4 12% 25% 16% 1	4120
	21st to end	Night	49% 3 11% 18% 16% 3	4532
February	1st to 10th	Night	43% 5% 12% 22% 15% 4	2464
	11th to 20th	Night	42% 4 9% 25% 17% 3	2274
	21st to end	Night	42% 4 8% 20% 19% 6%	1686
March	1st to 10th	Night	38% 5% 10% 19% 20% 8%	1980
	11th to 20th	Night	45% 6% 9% 18% 19% 3	1980
	21st to end	Night	45% 5% 11% 23% 13% 2	2178
April	1st to 10th	Night	32% 5% 12% 24% 21% 5%	1878
	11th to 20th	Night	38% 5% 10% 23% 20% 5%	1775
	21st to end	Night	42% 6% 11% 22% 18% 1	1756
May	1st to 10th	Night	38% 8% 12% 23% 17% 2	1620
	11th to 20th	Night	36% 8% 13% 24% 17% 1	1594
	21st to end	Night	37% 8% 16% 28% 11% 1	1746
June	1st to 10th	Night	26% 8% 16% 31% 16% 3	1590
	11th to 20th	Night	21% 8% 16% 31% 21% 3	1500
	21st to end	Night	19% 5% 17% 33% 21% 5%	1620
July	1st to 10th	Night	24% 9% 16% 30% 19% 3	1575
	11th to 20th	Night	20% 7% 12% 32% 25% 3	1566
	21st to end	Night	26% 8% 14% 34% 17% 1	1673
August	1st to 10th	Night	25% 9% 16% 32% 16% 2	1601
	11th to 20th	Night	23% 7% 13% 29% 26% 2	1600
	21st to end	Night	24% 7% 13% 26% 23% 7%	1980
September	1st to 10th	Night	28% 5% 12% 27% 21% 8%	1800
	11th to 20th	Night	31% 5% 9% 23% 26% 6%	1946
	21st to end	Night	26% 5% 9% 26% 29% 5%	1984
October	1st to 10th	Night	24% 5% 11% 26% 27% 7%	2160
	11th to 20th	Night	32% 4 7% 25% 25% 8%	2160
	21st to end	Night	37% 4 7% 22% 24% 6%	2376
November	1st to 10th	Night	27% 3 9% 27% 26% 8%	2220
	11th to 20th	Night	33% 4 6% 26% 25% 6%	2373
	21st to end	Night	36% 3 8% 23% 25% 4	2641
December	1st to 10th	Night	39% 4 11% 25% 19% 2	2660
	11th to 20th	Night	44% 3 7% 22% 21% 2	3281
	21st to end	Night	54% 5% 9% 19% 11% 3	4532

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% 37% 23% 4	270
	11th to 20th	Day	27% 16% 40% 15% 1	270
	21st to end	Day	18% 15% 47% 15% 5%	297
February	1st to 10th	Day	23% 19% 38% 17% 3	267
	11th to 20th	Day	20% 24% 39% 13% 4	240
	21st to end	Day	31% 20% 35% 13% 2	198
March	1st to 10th	Day	19% 20% 35% 22% 3	240
	11th to 20th	Day	30% 15% 30% 23% 3	240
	21st to end	Day	29% 19% 38% 11% 3	264
April	1st to 10th	Day	16% 19% 38% 22% 4 1	340
	11th to 20th	Day	22% 17% 36% 19% 6%	412
	21st to end	Day	24% 15% 32% 23% 6% 1	461
May	1st to 10th	Day	20% 13% 35% 23% 8% 1	603
	11th to 20th	Day	16% 9% 32% 27% 13% 3	625
	21st to end	Day	15% 7% 29% 26% 17% 6%	679
June	1st to 10th	Day	8% 4 19% 35% 25% 9%	630
	11th to 20th	Day	7% 4 22% 39% 22% 6%	630
	21st to end	Day	5% 3 27% 38% 22% 5%	630
July	1st to 10th	Day	10% 2 13% 31% 32% 12%	621
	11th to 20th	Day	4 2 15% 36% 33% 10%	618
	21st to end	Day	9% 1 12% 34% 32% 12%	684
August	1st to 10th	Day	9% 2 12% 42% 29% 5%	626
	11th to 20th	Day	8% 2 16% 34% 33% 6%	615
	21st to end	Day	9% 2 11% 29% 38% 12%	495
September	1st to 10th	Day	11% 2 10% 35% 32% 9%	450
	11th to 20th	Day	6% 1 17% 38% 27% 11%	300
	21st to end	Day	11% 4 20% 36% 21% 7%	270
October	1st to 10th	Day	12% 7% 26% 31% 17% 7%	270
	11th to 20th	Day	15% 12% 40% 25% 8%	270
	21st to end	Day	29% 12% 29% 24% 4 2	297
November	1st to 10th	Day	16% 10% 39% 24% 11% 2	270
	11th to 20th	Day	16% 17% 37% 20% 8% 2	270
	21st to end	Day	24% 14% 35% 22% 6%	270
December	1st to 10th	Day	17% 15% 43% 16% 8% 2	270
	11th to 20th	Day	21% 14% 40% 17% 7% 1	270
	21st to end	Day	21% 21% 38% 18% 2	297
January	1st to 10th	Night	16% 16% 39% 24% 5%	950
	11th to 20th	Night	18% 17% 40% 21% 4	950
	21st to end	Night	17% 15% 40% 25% 3	1045
February	1st to 10th	Night	21% 14% 40% 21% 3	948
	11th to 20th	Night	19% 16% 43% 19% 3	879
	21st to end	Night	21% 20% 35% 22% 2	502
March	1st to 10th	Night	17% 14% 40% 24% 4	540
	11th to 20th	Night	23% 12% 39% 23% 4	540
	21st to end	Night	21% 13% 40% 21% 5% 1	594
April	1st to 10th	Night	14% 13% 39% 30% 4	540
	11th to 20th	Night	17% 12% 33% 31% 6%	533
	21st to end	Night	20% 10% 40% 22% 7%	540
May	1st to 10th	Night	14% 7% 37% 35% 7%	540
	11th to 20th	Night	16% 5% 29% 33% 17% 1	531
	21st to end	Night	10% 5% 32% 34% 18% 1	584
June	1st to 10th	Night	7% 3 16% 45% 27% 1	540
	11th to 20th	Night	5% 2 24% 45% 22% 1	540
	21st to end	Night	2 2 24% 50% 21% 1	540
July	1st to 10th	Night	6% 1 12% 39% 38% 3	525
	11th to 20th	Night	4 1 11% 44% 34% 5%	522
	21st to end	Night	7% 1 11% 43% 34% 3	591
August	1st to 10th	Night	6% 2 14% 44% 34% 1	537
	11th to 20th	Night	6% 2 12% 50% 27% 3	534
	21st to end	Night	4 1 14% 39% 39% 4	594
September	1st to 10th	Night	11% 2 13% 42% 30% 2	540
	11th to 20th	Night	10% 3 14% 44% 26% 4	540
	21st to end	Night	10% 3 20% 43% 21% 3	544
October	1st to 10th	Night	9% 3 28% 37% 20% 3	720
	11th to 20th	Night	15% 7% 38% 30% 9% 1	720
	21st to end	Night	20% 10% 32% 28% 9% 1	792
November	1st to 10th	Night	13% 9% 42% 26% 9% 1	740
	11th to 20th	Night	15% 14% 37% 27% 7%	853
	21st to end	Night	21% 11% 37% 24% 7%	950
December	1st to 10th	Night	18% 13% 37% 26% 5%	950
	11th to 20th	Night	20% 13% 36% 27% 4	950
	21st to end	Night	18% 15% 40% 23% 3	1045

Page generated at 2024-02-07 05:11:58. Version ac07

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