Titusville
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Titusville clear sky chart from 2005-11-06 to 2024-03-28.

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	10% 5% 3 6% 6% 4 6% 6% 7% 9% 37%	79173
	Night	9% 5% 3 6% 6% 3 5% 6% 6% 9% 42%	80828
Transparency	Day	40% 10% 16% 17% 13% 4	78896
	Night	37% 10% 16% 20% 13% 5%	80624
Seeing	Day	9% 5% 19% 27% 22% 17%	14823
	Night	9% 4 17% 31% 29% 9%	25005

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	12% 7% 3 6% 5% 4 5% 4 5% 6% 43%	2836
	11th to 20th	Day	19% 8% 3 6% 6% 3 5% 5% 5% 7% 33%	2840
	21st to end	Day	13% 6% 3 6% 6% 4 4 5% 6% 7% 41%	3124
February	1st to 10th	Day	13% 5% 2 5% 5% 3 5% 5% 6% 8% 43%	1881
	11th to 20th	Day	7% 4 3 5% 6% 3 4 5% 5% 7% 51%	1859
	21st to end	Day	10% 4 3 4 5% 4 5% 4 5% 8% 49%	1727
March	1st to 10th	Day	6% 3 2 4 5% 4 5% 5% 6% 9% 51%	2090
	11th to 20th	Day	8% 4 2 5% 4 2 4 5% 6% 9% 51%	2090
	21st to end	Day	7% 4 1 4 5% 3 5% 5% 5% 8% 50%	2255
April	1st to 10th	Day	7% 3 2 5% 5% 3 5% 5% 7% 9% 48%	1980
	11th to 20th	Day	10% 4 2 5% 6% 4 5% 7% 8% 9% 39%	2047
	21st to end	Day	7% 3 2 3 5% 3 5% 6% 7% 10% 49%	2160
May	1st to 10th	Day	7% 4 1 3 4 2 4 4 5% 10% 55%	2200
	11th to 20th	Day	10% 5% 2 6% 6% 4 6% 6% 6% 10% 40%	2301
	21st to end	Day	9% 5% 3 7% 8% 4 7% 7% 8% 9% 34%	2531
June	1st to 10th	Day	15% 6% 2 7% 8% 5% 7% 7% 8% 9% 26%	2340
	11th to 20th	Day	6% 5% 3 7% 8% 5% 9% 8% 9% 11% 29%	2340
	21st to end	Day	10% 6% 4 7% 7% 4 7% 8% 8% 11% 29%	2340
July	1st to 10th	Day	10% 5% 3 8% 8% 6% 8% 8% 8% 10% 26%	2340
	11th to 20th	Day	10% 5% 4 7% 8% 5% 8% 7% 9% 11% 27%	2340
	21st to end	Day	9% 6% 3 7% 8% 5% 8% 7% 9% 12% 27%	2547
August	1st to 10th	Day	7% 4 3 6% 7% 6% 8% 8% 9% 14% 28%	2327
	11th to 20th	Day	8% 5% 3 7% 8% 5% 8% 9% 9% 12% 26%	2196
	21st to end	Day	11% 7% 4 7% 8% 4 7% 7% 7% 12% 26%	2240
September	1st to 10th	Day	10% 6% 3 7% 8% 6% 8% 9% 8% 10% 25%	1980
	11th to 20th	Day	10% 6% 3 7% 7% 5% 8% 8% 8% 12% 25%	1980
	21st to end	Day	13% 6% 3 7% 8% 5% 6% 7% 7% 9% 27%	1980
October	1st to 10th	Day	14% 6% 2 7% 7% 4 7% 6% 6% 8% 32%	1906
	11th to 20th	Day	8% 5% 3 6% 7% 3 5% 6% 6% 9% 42%	1800
	21st to end	Day	10% 4 2 4 5% 3 5% 6% 6% 8% 46%	1980
November	1st to 10th	Day	8% 4 2 6% 7% 4 6% 6% 7% 9% 40%	1857
	11th to 20th	Day	11% 5% 2 6% 6% 4 7% 5% 5% 8% 42%	1900
	21st to end	Day	11% 5% 3 6% 6% 3 6% 5% 7% 8% 40%	1872
December	1st to 10th	Day	8% 4 3 5% 6% 3 6% 5% 6% 8% 46%	1710
	11th to 20th	Day	14% 6% 2 5% 5% 4 5% 5% 4 8% 41%	2153
	21st to end	Day	13% 6% 3 6% 7% 5% 6% 6% 6% 7% 34%	3124
January	1st to 10th	Night	13% 6% 3 5% 5% 3 5% 5% 6% 7% 41%	4109
	11th to 20th	Night	18% 9% 3 7% 5% 4 5% 4 5% 8% 32%	4120
	21st to end	Night	12% 5% 2 6% 5% 4 5% 5% 7% 8% 42%	4532
February	1st to 10th	Night	11% 5% 2 5% 5% 3 4 5% 6% 8% 45%	2295
	11th to 20th	Night	11% 4 2 5% 4 3 4 4 6% 6% 51%	2204
	21st to end	Night	8% 3 2 3 4 3 4 4 4 8% 56%	1727
March	1st to 10th	Night	6% 3 1 3 4 3 4 4 5% 8% 57%	2090
	11th to 20th	Night	8% 3 2 3 3 2 4 4 6% 10% 53%	2090
	21st to end	Night	6% 3 2 5% 4 3 5% 5% 5% 8% 53%	2256
April	1st to 10th	Night	6% 3 2 4 4 2 4 4 5% 9% 57%	1980
	11th to 20th	Night	6% 5% 2 5% 6% 3 5% 5% 6% 10% 47%	1861
	21st to end	Night	6% 3 2 4 5% 2 5% 5% 5% 8% 54%	1800
May	1st to 10th	Night	5% 2 1 3 4 2 4 5% 5% 8% 60%	1773
	11th to 20th	Night	7% 6% 2 5% 4 4 6% 5% 7% 10% 45%	1592
	21st to end	Night	8% 4 3 6% 6% 3 5% 8% 8% 10% 39%	1744
June	1st to 10th	Night	11% 7% 3 7% 6% 3 6% 7% 7% 12% 31%	1620
	11th to 20th	Night	5% 6% 2 7% 7% 4 6% 8% 11% 11% 34%	1620
	21st to end	Night	8% 5% 3 7% 6% 4 5% 6% 7% 13% 36%	1620
July	1st to 10th	Night	8% 6% 3 7% 7% 4 7% 7% 9% 11% 32%	1620
	11th to 20th	Night	7% 6% 3 6% 6% 4 7% 8% 7% 11% 34%	1620
	21st to end	Night	6% 4 3 6% 7% 4 8% 7% 7% 12% 36%	1771
August	1st to 10th	Night	5% 4 2 6% 6% 4 7% 8% 7% 14% 37%	1611
	11th to 20th	Night	5% 4 3 5% 7% 5% 6% 7% 10% 12% 36%	1687
	21st to end	Night	10% 6% 3 6% 7% 5% 7% 7% 8% 11% 29%	2110
September	1st to 10th	Night	7% 6% 3 7% 7% 4 8% 8% 8% 11% 31%	1980
	11th to 20th	Night	9% 7% 4 7% 7% 5% 6% 7% 8% 12% 27%	1980
	21st to end	Night	11% 6% 3 7% 7% 4 6% 6% 8% 11% 31%	1980
October	1st to 10th	Night	11% 6% 2 7% 7% 4 5% 7% 6% 9% 38%	2052
	11th to 20th	Night	7% 5% 3 6% 6% 3 5% 5% 6% 8% 48%	2160
	21st to end	Night	9% 5% 2 6% 5% 3 5% 4 6% 8% 47%	2376
November	1st to 10th	Night	8% 5% 2 5% 5% 3 6% 6% 6% 8% 46%	2221
	11th to 20th	Night	9% 4 3 6% 6% 3 5% 5% 6% 9% 44%	2280
	21st to end	Night	11% 5% 3 6% 6% 5% 5% 5% 6% 9% 40%	2303
December	1st to 10th	Night	8% 4 2 4 5% 3 6% 5% 7% 9% 48%	2470
	11th to 20th	Night	14% 6% 3 5% 6% 3 4 4 5% 7% 42%	3042
	21st to end	Night	14% 6% 3 7% 6% 4 5% 6% 6% 7% 35%	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	40% 6% 9% 16% 22% 7%	2837
	11th to 20th	Day	49% 5% 6% 19% 17% 4	2840
	21st to end	Day	40% 7% 9% 18% 18% 8%	3124
February	1st to 10th	Day	37% 7% 13% 16% 20% 7%	1881
	11th to 20th	Day	30% 6% 12% 22% 22% 9%	1869
	21st to end	Day	33% 6% 12% 17% 25% 7%	1727
March	1st to 10th	Day	28% 8% 13% 25% 19% 6%	2090
	11th to 20th	Day	30% 6% 16% 26% 16% 6%	2090
	21st to end	Day	28% 7% 14% 24% 21% 6%	2255
April	1st to 10th	Day	30% 8% 16% 24% 17% 6%	1980
	11th to 20th	Day	37% 10% 13% 19% 17% 5%	2047
	21st to end	Day	28% 7% 14% 23% 21% 7%	2160
May	1st to 10th	Day	25% 7% 14% 23% 24% 7%	2200
	11th to 20th	Day	38% 10% 16% 20% 14% 2	2305
	21st to end	Day	41% 12% 14% 18% 14% 1	2531
June	1st to 10th	Day	50% 12% 19% 16% 3	2340
	11th to 20th	Day	43% 14% 23% 18% 2	2340
	21st to end	Day	45% 13% 23% 15% 3	2340
July	1st to 10th	Day	48% 17% 23% 11% 2	2275
	11th to 20th	Day	45% 17% 25% 12% 1	2271
	21st to end	Day	44% 16% 26% 13% 1	2405
August	1st to 10th	Day	39% 17% 30% 12% 1	2314
	11th to 20th	Day	43% 18% 28% 10% 1	2196
	21st to end	Day	48% 16% 24% 10% 2	2240
September	1st to 10th	Day	49% 18% 19% 10% 4	1980
	11th to 20th	Day	48% 15% 21% 13% 3	1980
	21st to end	Day	48% 12% 15% 13% 10% 2	1980
October	1st to 10th	Day	46% 10% 13% 14% 13% 4	1906
	11th to 20th	Day	37% 7% 11% 22% 18% 4	1800
	21st to end	Day	32% 8% 12% 19% 21% 9%	1980
November	1st to 10th	Day	37% 8% 12% 19% 19% 6%	1857
	11th to 20th	Day	40% 7% 11% 19% 18% 6%	1900
	21st to end	Day	39% 8% 11% 20% 17% 5%	1872
December	1st to 10th	Day	34% 7% 15% 26% 14% 4	1710
	11th to 20th	Day	41% 7% 11% 16% 17% 8%	2150
	21st to end	Day	45% 9% 12% 15% 12% 7%	3124
January	1st to 10th	Night	41% 7% 11% 18% 18% 6%	4109
	11th to 20th	Night	51% 5% 9% 19% 12% 4	4120
	21st to end	Night	38% 8% 11% 18% 15% 9%	4532
February	1st to 10th	Night	36% 6% 12% 19% 17% 10%	2295
	11th to 20th	Night	31% 6% 13% 21% 19% 10%	2205
	21st to end	Night	27% 5% 16% 21% 23% 7%	1727
March	1st to 10th	Night	25% 7% 14% 28% 20% 6%	2090
	11th to 20th	Night	26% 7% 18% 27% 15% 7%	2090
	21st to end	Night	27% 9% 13% 25% 19% 7%	2256
April	1st to 10th	Night	25% 7% 21% 24% 15% 8%	1980
	11th to 20th	Night	32% 9% 12% 24% 18% 4	1861
	21st to end	Night	27% 7% 13% 25% 22% 6%	1800
May	1st to 10th	Night	22% 8% 14% 25% 23% 8%	1773
	11th to 20th	Night	33% 10% 22% 21% 12% 2	1593
	21st to end	Night	36% 11% 15% 21% 16% 1	1745
June	1st to 10th	Night	44% 10% 23% 18% 4	1620
	11th to 20th	Night	37% 15% 23% 22% 3	1620
	21st to end	Night	39% 13% 25% 17% 5%	1620
July	1st to 10th	Night	42% 17% 27% 12% 1	1575
	11th to 20th	Night	40% 16% 29% 14% 1	1566
	21st to end	Night	36% 19% 28% 16% 1	1672
August	1st to 10th	Night	34% 17% 36% 12% 1	1600
	11th to 20th	Night	35% 18% 32% 13% 2	1687
	21st to end	Night	46% 15% 24% 13% 2	2110
September	1st to 10th	Night	42% 19% 20% 14% 5%	1980
	11th to 20th	Night	47% 16% 20% 16% 2	1980
	21st to end	Night	44% 14% 17% 14% 8% 3	1980
October	1st to 10th	Night	41% 10% 14% 20% 10% 5%	2052
	11th to 20th	Night	33% 8% 11% 26% 19% 4	2160
	21st to end	Night	33% 7% 13% 18% 19% 9%	2376
November	1st to 10th	Night	35% 8% 13% 19% 19% 7%	2221
	11th to 20th	Night	36% 8% 13% 20% 16% 7%	2280
	21st to end	Night	39% 8% 11% 20% 18% 4	2303
December	1st to 10th	Night	30% 7% 17% 29% 12% 5%	2470
	11th to 20th	Night	39% 7% 12% 17% 16% 9%	3044
	21st to end	Night	44% 10% 12% 17% 13% 5%	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	11% 13% 44% 24% 6% 2	270
	11th to 20th	Day	9% 9% 44% 24% 11% 3	270
	21st to end	Day	18% 14% 42% 22% 4	297
February	1st to 10th	Day	15% 12% 36% 21% 14% 1	270
	11th to 20th	Day	10% 7% 40% 29% 11% 3	281
	21st to end	Day	10% 7% 33% 31% 17% 2	382
March	1st to 10th	Day	5% 10% 38% 33% 12% 1	460
	11th to 20th	Day	8% 6% 34% 30% 19% 3	460
	21st to end	Day	7% 6% 34% 31% 18% 5%	490
April	1st to 10th	Day	7% 8% 34% 31% 15% 5%	420
	11th to 20th	Day	9% 9% 27% 30% 19% 7%	412
	21st to end	Day	6% 5% 23% 35% 20% 11%	420
May	1st to 10th	Day	6% 4 25% 30% 23% 11%	423
	11th to 20th	Day	11% 3 14% 32% 24% 17%	447
	21st to end	Day	8% 5% 8% 29% 27% 24%	485
June	1st to 10th	Day	16% 3 10% 27% 21% 22%	450
	11th to 20th	Day	4 2 7% 24% 30% 34%	450
	21st to end	Day	8% 2 4 16% 31% 40%	450
July	1st to 10th	Day	5% 3 3 12% 33% 45%	445
	11th to 20th	Day	5% 2 3 14% 35% 41%	444
	21st to end	Day	9% 2 3 16% 30% 39%	488
August	1st to 10th	Day	6% 1 4 17% 33% 39%	446
	11th to 20th	Day	5% 1 2 15% 29% 47%	439
	21st to end	Day	9% 1 5% 21% 29% 34%	495
September	1st to 10th	Day	9% 1 5% 15% 32% 37%	450
	11th to 20th	Day	9% 2 8% 25% 25% 31%	450
	21st to end	Day	9% 2 6% 28% 30% 25%	450
October	1st to 10th	Day	16% 2 17% 35% 21% 9%	450
	11th to 20th	Day	6% 4 16% 35% 28% 10%	450
	21st to end	Day	6% 3 22% 38% 24% 7%	495
November	1st to 10th	Day	8% 7% 20% 36% 22% 7%	455
	11th to 20th	Day	10% 8% 25% 35% 17% 5%	460
	21st to end	Day	11% 4 26% 39% 17% 2	432
December	1st to 10th	Day	7% 7% 36% 34% 13% 3	270
	11th to 20th	Day	15% 9% 31% 31% 13% 2	270
	21st to end	Day	6% 10% 28% 38% 15% 2	297
January	1st to 10th	Night	13% 8% 28% 34% 16% 2	760
	11th to 20th	Night	12% 8% 26% 37% 17% 2	760
	21st to end	Night	14% 9% 33% 35% 10%	836
February	1st to 10th	Night	11% 7% 27% 37% 17% 1	760
	11th to 20th	Night	11% 8% 30% 36% 14% 1	743
	21st to end	Night	9% 4 31% 41% 14%	628
March	1st to 10th	Night	4 7% 33% 42% 13% 1	760
	11th to 20th	Night	8% 4 27% 40% 18% 2	760
	21st to end	Night	6% 5% 31% 38% 19% 2	821
April	1st to 10th	Night	6% 5% 28% 41% 18% 2	720
	11th to 20th	Night	8% 5% 25% 39% 22% 2	711
	21st to end	Night	6% 4 23% 43% 22% 3	720
May	1st to 10th	Night	6% 3 17% 45% 27% 2	693
	11th to 20th	Night	8% 2 11% 36% 33% 9%	531
	21st to end	Night	7% 1 7% 29% 41% 14%	584
June	1st to 10th	Night	13% 2 6% 27% 40% 11%	540
	11th to 20th	Night	6% 2 5% 21% 45% 22%	540
	21st to end	Night	6% 2 3 18% 47% 24%	540
July	1st to 10th	Night	8% 2 2 11% 50% 27%	525
	11th to 20th	Night	7% 2 2 9% 48% 33%	522
	21st to end	Night	6% 2 2 9% 52% 29%	591
August	1st to 10th	Night	3 1 2 13% 53% 28%	537
	11th to 20th	Night	4 1 1 14% 48% 31%	623
	21st to end	Night	10% 2 4 19% 40% 25%	792
September	1st to 10th	Night	9% 3 4 17% 41% 26%	720
	11th to 20th	Night	10% 3 5% 20% 43% 20%	720
	21st to end	Night	11% 3 6% 22% 41% 18%	720
October	1st to 10th	Night	12% 3 12% 31% 34% 8%	720
	11th to 20th	Night	8% 4 10% 31% 39% 8%	720
	21st to end	Night	11% 3 16% 31% 34% 6%	792
November	1st to 10th	Night	9% 5% 20% 33% 28% 5%	740
	11th to 20th	Night	8% 5% 22% 37% 25% 3	760
	21st to end	Night	11% 4 23% 41% 20% 2	760
December	1st to 10th	Night	7% 4 23% 37% 26% 3	760
	11th to 20th	Night	10% 7% 22% 35% 22% 4	760
	21st to end	Night	11% 6% 26% 36% 20% 2	836

Page generated at 2024-03-24 23:37:05. Version ac07

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