Terre Haute
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Terre Haute clear sky chart from 2005-11-06 to 2024-08-30.

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	14% 8% 3 7% 4 4 4 4 6% 7% 38%	95615
	Night	16% 9% 3 7% 4 4 4 3 5% 6% 39%	93441
Transparency	Day	44% 6% 12% 23% 13% 2	95369
	Night	45% 5% 11% 22% 15% 2	93294
Seeing	Day	16% 9% 25% 25% 17% 7%	15369
	Night	18% 8% 27% 31% 15% 1	25162

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% 15% 7% 11% 5% 4 3 3 5% 5% 26%	2527
	11th to 20th	Day	16% 12% 5% 12% 6% 8% 7% 6% 5% 5% 19%	2530
	21st to end	Day	28% 19% 5% 7% 3 3 2 2 4 5% 22%	2940
February	1st to 10th	Day	17% 13% 5% 9% 6% 3 3 3 5% 6% 31%	1883
	11th to 20th	Day	17% 10% 4 11% 5% 5% 4 3 5% 6% 32%	1848
	21st to end	Day	18% 12% 3 8% 5% 4 4 4 4 6% 34%	1570
March	1st to 10th	Day	20% 17% 3 8% 4 3 3 2 3 3 33%	3120
	11th to 20th	Day	13% 9% 3 5% 4 3 4 3 4 7% 44%	3256
	21st to end	Day	15% 9% 4 8% 5% 5% 5% 4 6% 7% 31%	4148
April	1st to 10th	Day	16% 11% 2 6% 4 3 4 3 5% 8% 37%	2280
	11th to 20th	Day	17% 8% 2 6% 4 4 4 4 6% 5% 40%	2254
	21st to end	Day	20% 8% 3 7% 5% 4 4 3 5% 7% 36%	2363
May	1st to 10th	Day	18% 8% 3 8% 5% 4 5% 4 6% 9% 30%	4082
	11th to 20th	Day	19% 7% 2 6% 4 4 4 4 4 7% 38%	4081
	21st to end	Day	10% 6% 2 7% 4 5% 5% 5% 7% 8% 42%	4730
June	1st to 10th	Day	11% 5% 2 6% 4 3 4 5% 6% 9% 44%	2660
	11th to 20th	Day	8% 4 2 4 4 4 5% 5% 6% 9% 48%	2660
	21st to end	Day	10% 5% 2 6% 4 5% 5% 4 7% 9% 43%	2660
July	1st to 10th	Day	13% 6% 2 6% 4 4 5% 4 6% 10% 40%	4440
	11th to 20th	Day	6% 4 2 6% 4 5% 5% 5% 8% 10% 45%	4440
	21st to end	Day	11% 6% 2 7% 5% 5% 6% 5% 8% 10% 35%	4813
August	1st to 10th	Day	8% 4 2 6% 4 4 4 4 6% 10% 47%	2432
	11th to 20th	Day	10% 5% 1 6% 5% 5% 5% 4 8% 9% 42%	2245
	21st to end	Day	5% 5% 1 5% 4 5% 4 4 6% 9% 51%	2485
September	1st to 10th	Day	11% 5% 3 5% 5% 4 5% 4 5% 7% 46%	2160
	11th to 20th	Day	10% 4 2 5% 4 4 5% 5% 6% 8% 47%	2004
	21st to end	Day	11% 4 1 5% 4 4 4 3 5% 7% 52%	1980
October	1st to 10th	Day	13% 4 2 5% 4 4 3 3 5% 6% 51%	1980
	11th to 20th	Day	16% 5% 2 7% 4 4 4 3 5% 6% 44%	1825
	21st to end	Day	20% 7% 2 7% 5% 4 4 3 4 5% 39%	1782
November	1st to 10th	Day	11% 5% 2 5% 4 4 4 3 4 7% 52%	1672
	11th to 20th	Day	18% 9% 2 7% 4 3 3 3 4 6% 41%	1710
	21st to end	Day	19% 9% 3 7% 4 5% 3 3 4 5% 39%	1710
December	1st to 10th	Day	19% 12% 4 8% 5% 4 4 2 4 5% 32%	1644
	11th to 20th	Day	17% 13% 6% 8% 4 3 4 3 4 6% 31%	1918
	21st to end	Day	25% 18% 7% 10% 5% 4 4 3 4 4 18%	2783
January	1st to 10th	Night	19% 14% 7% 10% 4 3 4 3 4 6% 28%	4428
	11th to 20th	Night	16% 18% 5% 10% 6% 6% 4 3 3 4 23%	4440
	21st to end	Night	27% 16% 5% 8% 3 3 3 3 4 6% 23%	4724
February	1st to 10th	Night	20% 12% 4 9% 5% 4 3 4 4 5% 31%	2295
	11th to 20th	Night	15% 10% 3 9% 5% 4 4 3 5% 6% 35%	2218
	21st to end	Night	20% 11% 4 7% 4 3 3 3 5% 5% 35%	1884
March	1st to 10th	Night	21% 16% 3 6% 4 3 3 3 4 5% 33%	3733
	11th to 20th	Night	14% 7% 2 5% 4 4 3 3 4 6% 48%	3690
	21st to end	Night	18% 7% 3 8% 5% 4 3 4 5% 6% 37%	3512
April	1st to 10th	Night	15% 8% 3 6% 4 4 5% 3 5% 7% 41%	1900
	11th to 20th	Night	17% 7% 3 5% 3 3 4 3 4 7% 43%	1875
	21st to end	Night	17% 8% 2 7% 5% 5% 5% 5% 6% 5% 36%	1815
May	1st to 10th	Night	17% 10% 3 7% 5% 5% 4 3 6% 8% 32%	2813
	11th to 20th	Night	18% 6% 2 6% 4 4 4 3 5% 7% 42%	2812
	21st to end	Night	11% 5% 2 6% 4 5% 5% 4 6% 9% 43%	2818
June	1st to 10th	Night	10% 6% 3 5% 4 4 4 3 5% 7% 50%	1520
	11th to 20th	Night	8% 5% 2 5% 4 4 5% 2 6% 8% 52%	1520
	21st to end	Night	7% 5% 2 5% 4 4 4 4 8% 11% 45%	1520
July	1st to 10th	Night	11% 5% 2 6% 3 3 4 2 6% 9% 49%	2530
	11th to 20th	Night	5% 3 2 4 3 3 5% 4 7% 9% 54%	2530
	21st to end	Night	8% 7% 3 8% 5% 4 5% 4 5% 11% 40%	2750
August	1st to 10th	Night	7% 4 2 4 4 3 5% 4 5% 11% 50%	1719
	11th to 20th	Night	6% 4 2 5% 4 4 4 5% 6% 9% 50%	1876
	21st to end	Night	7% 4 1 3 3 4 4 3 6% 8% 57%	2080
September	1st to 10th	Night	12% 5% 2 5% 4 3 4 3 6% 7% 50%	1800
	11th to 20th	Night	7% 4 2 4 4 3 3 3 5% 8% 58%	1936
	21st to end	Night	12% 5% 2 5% 4 3 3 3 5% 7% 50%	1980
October	1st to 10th	Night	9% 4 2 6% 3 3 4 4 5% 6% 56%	1980
	11th to 20th	Night	17% 6% 2 4 2 3 3 3 4 6% 49%	2129
	21st to end	Night	18% 8% 2 5% 4 4 4 3 5% 6% 40%	2574
November	1st to 10th	Night	11% 6% 2 5% 4 4 4 3 4 5% 51%	2406
	11th to 20th	Night	13% 9% 3 6% 4 3 4 3 4 7% 44%	2470
	21st to end	Night	21% 9% 4 6% 4 4 3 2 4 6% 37%	2470
December	1st to 10th	Night	18% 12% 4 8% 5% 3 3 3 5% 5% 33%	2531
	11th to 20th	Night	18% 12% 3 8% 4 4 3 3 4 5% 35%	3279
	21st to end	Night	27% 16% 5% 9% 4 4 3 3 3 4 20%	4884

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	59% 5% 7% 21% 7%	2528
	11th to 20th	Day	66% 4 13% 12% 5%	2530
	21st to end	Day	68% 3 8% 17% 3 1	2940
February	1st to 10th	Day	54% 4 11% 19% 9% 2	1883
	11th to 20th	Day	52% 5% 11% 22% 9% 1	1858
	21st to end	Day	53% 5% 9% 22% 9% 2	1570
March	1st to 10th	Day	56% 4 7% 18% 12% 2	3120
	11th to 20th	Day	39% 5% 12% 28% 15% 1	3256
	21st to end	Day	49% 8% 13% 24% 6% 1	4148
April	1st to 10th	Day	45% 6% 12% 22% 14% 1	2280
	11th to 20th	Day	44% 6% 9% 25% 12% 4	2254
	21st to end	Day	48% 5% 11% 22% 10% 3	2363
May	1st to 10th	Day	47% 9% 14% 23% 7%	4120
	11th to 20th	Day	45% 6% 11% 27% 10%	4085
	21st to end	Day	37% 8% 12% 20% 20% 3	4743
June	1st to 10th	Day	34% 8% 13% 25% 16% 4	2660
	11th to 20th	Day	31% 8% 13% 23% 22% 4	2660
	21st to end	Day	35% 9% 16% 20% 17% 4	2660
July	1st to 10th	Day	40% 5% 11% 27% 14% 2	4371
	11th to 20th	Day	32% 6% 13% 30% 17% 1	4365
	21st to end	Day	42% 5% 17% 20% 14% 2	4662
August	1st to 10th	Day	32% 8% 15% 28% 15% 2	2418
	11th to 20th	Day	35% 9% 14% 27% 14% 2	2245
	21st to end	Day	28% 7% 14% 27% 17% 7%	2485
September	1st to 10th	Day	37% 7% 11% 25% 17% 4	2160
	11th to 20th	Day	31% 9% 11% 25% 21% 3	2004
	21st to end	Day	31% 6% 10% 25% 25% 3	1980
October	1st to 10th	Day	34% 5% 11% 26% 21% 3	1980
	11th to 20th	Day	40% 5% 10% 22% 22% 1	1825
	21st to end	Day	48% 4 9% 25% 14% 1	1782
November	1st to 10th	Day	33% 4 13% 27% 16% 5%	1672
	11th to 20th	Day	45% 4 9% 23% 16% 4	1710
	21st to end	Day	49% 4 9% 22% 15% 1	1710
December	1st to 10th	Day	55% 5% 10% 19% 10% 1	1644
	11th to 20th	Day	56% 4 8% 25% 6% 1	1915
	21st to end	Day	70% 5% 10% 11% 5%	2783
January	1st to 10th	Night	58% 5% 12% 18% 7%	4428
	11th to 20th	Night	66% 4 9% 14% 7%	4440
	21st to end	Night	64% 4 9% 16% 7%	4724
February	1st to 10th	Night	56% 5% 12% 17% 8% 1	2295
	11th to 20th	Night	50% 4 11% 20% 13% 2	2219
	21st to end	Night	52% 4 10% 21% 11% 2	1884
March	1st to 10th	Night	54% 4 8% 22% 10% 1	3733
	11th to 20th	Night	36% 5% 10% 25% 22% 1	3690
	21st to end	Night	46% 6% 11% 28% 7% 1	3512
April	1st to 10th	Night	42% 6% 10% 25% 15% 2	1900
	11th to 20th	Night	41% 5% 9% 22% 17% 5%	1875
	21st to end	Night	47% 7% 10% 20% 13% 3	1815
May	1st to 10th	Night	48% 8% 14% 22% 7%	2840
	11th to 20th	Night	42% 6% 13% 26% 12% 1	2813
	21st to end	Night	36% 9% 12% 20% 18% 4	2826
June	1st to 10th	Night	34% 6% 10% 25% 22% 4	1520
	11th to 20th	Night	31% 6% 11% 24% 22% 6%	1520
	21st to end	Night	29% 8% 17% 21% 20% 6%	1520
July	1st to 10th	Night	34% 6% 11% 25% 20% 4	2490
	11th to 20th	Night	26% 4 13% 31% 24% 2	2482
	21st to end	Night	41% 4 17% 21% 15% 3	2662
August	1st to 10th	Night	28% 8% 15% 29% 18% 3	1709
	11th to 20th	Night	28% 7% 14% 27% 20% 3	1876
	21st to end	Night	24% 6% 14% 27% 22% 7%	2080
September	1st to 10th	Night	33% 6% 11% 26% 19% 6%	1800
	11th to 20th	Night	26% 4 11% 28% 26% 5%	1936
	21st to end	Night	32% 6% 10% 23% 24% 5%	1980
October	1st to 10th	Night	29% 6% 11% 25% 25% 4	1980
	11th to 20th	Night	36% 4 8% 25% 23% 4	2129
	21st to end	Night	45% 5% 9% 22% 17% 3	2574
November	1st to 10th	Night	35% 5% 9% 26% 21% 5%	2406
	11th to 20th	Night	40% 4 10% 24% 19% 3	2470
	21st to end	Night	50% 3 10% 23% 13% 1	2470
December	1st to 10th	Night	53% 5% 11% 19% 11% 1	2531
	11th to 20th	Night	52% 4 11% 20% 13%	3281
	21st to end	Night	69% 5% 8% 11% 6% 1	4884

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	25% 19% 30% 18% 7% 1	270
	11th to 20th	Day	27% 14% 36% 18% 4	270
	21st to end	Day	25% 21% 32% 19% 4	297
February	1st to 10th	Day	27% 17% 33% 18% 4	270
	11th to 20th	Day	25% 20% 34% 15% 5% 1	270
	21st to end	Day	30% 13% 40% 14% 3	225
March	1st to 10th	Day	21% 21% 38% 16% 4	270
	11th to 20th	Day	28% 18% 34% 16% 5%	327
	21st to end	Day	28% 16% 32% 17% 7%	506
April	1st to 10th	Day	20% 17% 32% 23% 7% 1	460
	11th to 20th	Day	19% 17% 27% 23% 12% 2	452
	21st to end	Day	22% 15% 34% 18% 9% 2	460
May	1st to 10th	Day	20% 12% 30% 25% 10% 3	463
	11th to 20th	Day	19% 8% 28% 25% 15% 6%	487
	21st to end	Day	10% 5% 29% 26% 20% 10%	679
June	1st to 10th	Day	12% 5% 22% 32% 23% 6%	680
	11th to 20th	Day	10% 5% 22% 33% 23% 7%	680
	21st to end	Day	12% 5% 28% 27% 21% 8%	680
July	1st to 10th	Day	11% 4 14% 27% 24% 19%	671
	11th to 20th	Day	6% 3 18% 32% 28% 13%	668
	21st to end	Day	11% 2 14% 30% 32% 11%	739
August	1st to 10th	Day	10% 1 13% 29% 31% 16%	488
	11th to 20th	Day	15% 2 15% 32% 27% 10%	479
	21st to end	Day	5% 2 11% 32% 35% 15%	532
September	1st to 10th	Day	11% 4 15% 28% 31% 11%	450
	11th to 20th	Day	9% 2 11% 30% 29% 18%	450
	21st to end	Day	12% 7% 23% 23% 23% 13%	450
October	1st to 10th	Day	12% 4 26% 32% 19% 7%	450
	11th to 20th	Day	16% 15% 32% 22% 13% 2	302
	21st to end	Day	25% 19% 32% 19% 6%	297
November	1st to 10th	Day	13% 13% 34% 24% 14% 3	270
	11th to 20th	Day	21% 16% 30% 20% 10% 2	270
	21st to end	Day	21% 13% 34% 22% 9%	270
December	1st to 10th	Day	17% 21% 36% 18% 7% 2	270
	11th to 20th	Day	23% 13% 36% 20% 6% 1	270
	21st to end	Day	34% 14% 32% 14% 5%	297
January	1st to 10th	Night	22% 13% 33% 27% 5%	950
	11th to 20th	Night	26% 13% 35% 21% 4	950
	21st to end	Night	23% 13% 36% 25% 3	1045
February	1st to 10th	Night	26% 11% 35% 26% 2	775
	11th to 20th	Night	22% 14% 37% 24% 3	743
	21st to end	Night	26% 11% 37% 23% 3	628
March	1st to 10th	Night	22% 14% 35% 26% 4	760
	11th to 20th	Night	21% 12% 35% 26% 5%	760
	21st to end	Night	25% 7% 32% 30% 6%	660
April	1st to 10th	Night	17% 12% 33% 33% 5%	570
	11th to 20th	Night	20% 12% 27% 29% 12%	563
	21st to end	Night	19% 9% 36% 28% 6% 1	570
May	1st to 10th	Night	18% 7% 31% 33% 11%	570
	11th to 20th	Night	15% 5% 26% 35% 18% 1	561
	21st to end	Night	10% 3 22% 39% 24% 2	617
June	1st to 10th	Night	10% 5% 19% 43% 22% 1	570
	11th to 20th	Night	10% 2 21% 44% 23% 1	570
	21st to end	Night	8% 1 22% 41% 27% 1	570
July	1st to 10th	Night	9% 2 12% 32% 38% 7%	555
	11th to 20th	Night	6% 3 14% 39% 34% 4	552
	21st to end	Night	6% 2 13% 44% 32% 3	624
August	1st to 10th	Night	9% 2 9% 40% 38% 3	567
	11th to 20th	Night	7% 2 12% 41% 34% 4	564
	21st to end	Night	8% 1 12% 33% 41% 5%	624
September	1st to 10th	Night	12% 3 14% 37% 30% 4	540
	11th to 20th	Night	8% 3 16% 34% 36% 4	676
	21st to end	Night	13% 6% 19% 33% 25% 4	720
October	1st to 10th	Night	9% 6% 22% 37% 21% 4	720
	11th to 20th	Night	19% 9% 28% 28% 14% 1	720
	21st to end	Night	23% 10% 32% 28% 7%	792
November	1st to 10th	Night	15% 7% 33% 32% 13%	740
	11th to 20th	Night	16% 12% 32% 30% 9%	760
	21st to end	Night	24% 10% 31% 27% 8%	760
December	1st to 10th	Night	23% 10% 37% 25% 5%	821
	11th to 20th	Night	25% 9% 33% 26% 7% 1	950
	21st to end	Night	30% 14% 30% 22% 3	1045

Page generated at 2024-08-27 09:49:43. Version ac07

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