Indian Foothills Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Indian Foothills Park clear sky chart from 2005-11-06 to 2024-11-02.

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% 8% 3 6% 4 4 4 3 5% 7% 44%	101185
	Night	12% 8% 3 6% 4 4 4 3 5% 6% 45%	97841
Transparency	Day	39% 6% 13% 26% 15% 2	100992
	Night	39% 5% 12% 25% 17% 3	97706
Seeing	Day	14% 9% 27% 28% 17% 5%	15673
	Night	15% 9% 31% 32% 13% 1	25481

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	13% 11% 4 10% 4 4 4 5% 5% 6% 32%	2723
	11th to 20th	Day	11% 12% 4 10% 5% 6% 7% 3 3 4 35%	2850
	21st to end	Day	16% 17% 5% 10% 5% 3 3 3 4 5% 29%	3135
February	1st to 10th	Day	16% 10% 4 8% 6% 4 4 3 4 6% 34%	1710
	11th to 20th	Day	14% 10% 3 8% 5% 3 3 3 4 6% 41%	1664
	21st to end	Day	13% 10% 4 6% 5% 3 4 4 6% 5% 40%	1593
March	1st to 10th	Day	16% 11% 3 5% 3 3 3 2 4 5% 46%	3436
	11th to 20th	Day	12% 7% 3 5% 3 3 3 3 5% 7% 49%	3480
	21st to end	Day	18% 14% 3 7% 5% 4 4 3 4 6% 31%	3814
April	1st to 10th	Day	15% 7% 2 7% 4 4 3 3 5% 6% 43%	2270
	11th to 20th	Day	15% 10% 3 6% 4 3 3 3 5% 6% 41%	2254
	21st to end	Day	21% 6% 3 7% 5% 4 5% 3 6% 6% 34%	2299
May	1st to 10th	Day	13% 7% 3 7% 5% 4 5% 5% 7% 9% 35%	4082
	11th to 20th	Day	16% 8% 3 7% 5% 4 4 3 6% 6% 38%	4145
	21st to end	Day	12% 6% 2 6% 4 4 5% 4 5% 7% 45%	4824
June	1st to 10th	Day	7% 5% 2 5% 4 4 4 5% 7% 10% 47%	2660
	11th to 20th	Day	8% 4 2 7% 4 4 5% 4 6% 9% 47%	2660
	21st to end	Day	7% 4 2 6% 4 4 5% 4 7% 8% 48%	2660
July	1st to 10th	Day	12% 6% 2 6% 4 4 5% 4 6% 8% 42%	4440
	11th to 20th	Day	5% 5% 2 5% 4 4 5% 4 6% 9% 53%	4136
	21st to end	Day	7% 5% 2 6% 4 5% 5% 4 7% 10% 45%	4465
August	1st to 10th	Day	5% 3 2 4 4 4 5% 4 7% 11% 52%	4104
	11th to 20th	Day	11% 5% 2 6% 4 3 5% 4 6% 8% 46%	3991
	21st to end	Day	6% 4 2 4 4 4 4 4 5% 9% 53%	4180
September	1st to 10th	Day	11% 4 2 5% 4 3 3 3 5% 7% 54%	2280
	11th to 20th	Day	10% 5% 1 5% 3 4 3 3 5% 8% 52%	2237
	21st to end	Day	8% 6% 2 5% 4 3 4 3 4 6% 54%	2005
October	1st to 10th	Day	12% 4 2 5% 4 3 4 3 4 5% 54%	1900
	11th to 20th	Day	14% 7% 2 5% 3 2 3 3 4 4 54%	1900
	21st to end	Day	16% 8% 3 6% 3 3 3 3 4 5% 47%	2090
November	1st to 10th	Day	11% 7% 1 5% 3 3 3 3 4 6% 54%	1840
	11th to 20th	Day	14% 7% 2 6% 4 3 3 2 6% 5% 48%	1617
	21st to end	Day	16% 10% 3 7% 3 3 3 2 4 5% 44%	1520
December	1st to 10th	Day	10% 11% 4 7% 4 5% 3 3 4 7% 42%	1520
	11th to 20th	Day	12% 10% 4 8% 4 4 5% 3 4 5% 42%	1918
	21st to end	Day	17% 15% 7% 11% 5% 5% 4 3 4 5% 25%	2783
January	1st to 10th	Night	10% 10% 4 14% 5% 4 4 3 4 4 36%	4230
	11th to 20th	Night	13% 10% 5% 9% 5% 7% 5% 5% 5% 4 32%	4120
	21st to end	Night	18% 14% 6% 10% 4 4 4 3 4 4 32%	4532
February	1st to 10th	Night	14% 11% 4 8% 5% 5% 4 3 5% 5% 36%	2470
	11th to 20th	Night	14% 9% 3 6% 4 3 4 3 5% 6% 42%	2403
	21st to end	Night	14% 8% 4 7% 4 3 4 3 5% 5% 43%	1874
March	1st to 10th	Night	16% 11% 3 6% 3 3 3 2 4 4 45%	3419
	11th to 20th	Night	12% 6% 2 5% 4 3 3 3 4 6% 53%	3480
	21st to end	Night	17% 11% 5% 8% 5% 4 4 4 4 6% 31%	3817
April	1st to 10th	Night	11% 7% 3 5% 4 3 3 3 5% 7% 49%	1910
	11th to 20th	Night	14% 7% 2 7% 4 4 4 2 5% 6% 46%	1875
	21st to end	Night	16% 7% 3 7% 4 3 4 3 5% 6% 41%	1876
May	1st to 10th	Night	14% 8% 2 7% 4 5% 5% 4 6% 7% 37%	2823
	11th to 20th	Night	12% 8% 3 6% 5% 3 4 3 5% 9% 40%	2742
	21st to end	Night	10% 5% 2 5% 4 3 4 3 5% 8% 50%	2743
June	1st to 10th	Night	7% 3 1 4 4 3 5% 4 6% 9% 53%	1520
	11th to 20th	Night	5% 3 2 5% 5% 4 5% 3 7% 10% 51%	1520
	21st to end	Night	4 4 1 4 4 4 4 3 7% 8% 57%	1520
July	1st to 10th	Night	13% 6% 3 5% 3 3 4 3 6% 8% 45%	2530
	11th to 20th	Night	3 2 2 4 4 4 4 4 6% 9% 58%	2815
	21st to end	Night	5% 3 2 5% 5% 4 5% 5% 8% 9% 48%	3098
August	1st to 10th	Night	3 2 1 3 3 3 4 3 6% 11% 61%	2836
	11th to 20th	Night	11% 7% 2 5% 3 3 4 3 5% 7% 51%	2846
	21st to end	Night	4 3 1 5% 3 4 5% 4 6% 8% 57%	3476
September	1st to 10th	Night	10% 4 2 4 3 3 3 4 4 6% 58%	1900
	11th to 20th	Night	9% 4 1 5% 3 4 4 3 6% 6% 54%	1940
	21st to end	Night	8% 4 2 5% 3 4 4 3 4 6% 56%	2156
October	1st to 10th	Night	10% 4 1 4 3 3 3 3 5% 6% 58%	2280
	11th to 20th	Night	14% 5% 2 5% 3 3 3 2 4 5% 55%	2280
	21st to end	Night	16% 7% 2 4 3 3 3 2 5% 4 50%	2508
November	1st to 10th	Night	10% 5% 1 4 3 2 3 3 4 7% 58%	2259
	11th to 20th	Night	11% 7% 3 5% 3 3 4 3 4 6% 52%	2560
	21st to end	Night	18% 9% 2 5% 3 4 3 3 3 4 47%	2660
December	1st to 10th	Night	13% 8% 4 6% 4 4 4 3 4 7% 43%	2660
	11th to 20th	Night	14% 9% 3 7% 4 4 4 2 5% 6% 42%	3279
	21st to end	Night	20% 16% 6% 10% 5% 4 3 3 3 4 27%	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	50% 5% 12% 23% 9% 1	2724
	11th to 20th	Day	54% 3 12% 22% 9%	2850
	21st to end	Day	57% 4 10% 16% 10% 1	3135
February	1st to 10th	Day	51% 5% 12% 21% 11% 1	1710
	11th to 20th	Day	46% 5% 11% 21% 14% 3	1673
	21st to end	Day	45% 5% 10% 22% 15% 3	1593
March	1st to 10th	Day	43% 3 8% 25% 19% 2	3436
	11th to 20th	Day	34% 6% 12% 28% 16% 4	3480
	21st to end	Day	52% 7% 16% 19% 5%	3814
April	1st to 10th	Day	41% 5% 11% 26% 15% 1	2270
	11th to 20th	Day	44% 5% 12% 24% 13% 2	2254
	21st to end	Day	49% 6% 11% 21% 11% 1	2299
May	1st to 10th	Day	42% 10% 13% 23% 12% 1	4120
	11th to 20th	Day	45% 8% 12% 24% 11%	4149
	21st to end	Day	37% 8% 10% 29% 15% 1	4837
June	1st to 10th	Day	30% 8% 16% 30% 14% 1	2660
	11th to 20th	Day	32% 8% 15% 27% 16% 2	2660
	21st to end	Day	29% 7% 17% 28% 14% 4	2660
July	1st to 10th	Day	38% 7% 12% 24% 16% 3	4371
	11th to 20th	Day	27% 7% 13% 33% 17% 2	4066
	21st to end	Day	31% 8% 19% 30% 11% 1	4325
August	1st to 10th	Day	24% 8% 17% 32% 17% 1	4090
	11th to 20th	Day	36% 6% 14% 28% 15% 1	4030
	21st to end	Day	26% 7% 15% 34% 14% 4	4179
September	1st to 10th	Day	30% 5% 13% 26% 20% 6%	2280
	11th to 20th	Day	30% 5% 11% 26% 24% 3	2237
	21st to end	Day	31% 5% 10% 28% 23% 3	2005
October	1st to 10th	Day	32% 4 10% 25% 25% 4	1900
	11th to 20th	Day	34% 3 8% 27% 24% 5%	1900
	21st to end	Day	41% 3 10% 22% 19% 4	2090
November	1st to 10th	Day	33% 4 13% 25% 20% 5%	1840
	11th to 20th	Day	37% 4 10% 25% 20% 3	1617
	21st to end	Day	44% 3 10% 28% 16%	1520
December	1st to 10th	Day	42% 6% 12% 28% 12% 1	1520
	11th to 20th	Day	46% 4 15% 25% 9% 2	1915
	21st to end	Day	62% 5% 10% 14% 8% 1	2783
January	1st to 10th	Night	51% 5% 11% 22% 11% 1	4230
	11th to 20th	Night	53% 5% 11% 19% 10% 1	4120
	21st to end	Night	57% 4 11% 19% 9% 1	4532
February	1st to 10th	Night	49% 5% 11% 20% 13% 3	2470
	11th to 20th	Night	44% 4 11% 21% 17% 2	2404
	21st to end	Night	41% 5% 10% 20% 19% 4	1874
March	1st to 10th	Night	43% 5% 8% 22% 18% 3	3419
	11th to 20th	Night	32% 5% 9% 26% 23% 4	3480
	21st to end	Night	52% 7% 13% 23% 5% 1	3817
April	1st to 10th	Night	35% 6% 9% 27% 19% 4	1910
	11th to 20th	Night	38% 5% 9% 27% 17% 4	1875
	21st to end	Night	43% 6% 10% 23% 17% 1	1876
May	1st to 10th	Night	41% 10% 13% 19% 15% 1	2850
	11th to 20th	Night	40% 8% 13% 28% 11% 1	2743
	21st to end	Night	31% 8% 12% 23% 24% 2	2751
June	1st to 10th	Night	25% 8% 16% 31% 18% 4	1520
	11th to 20th	Night	26% 8% 13% 28% 21% 4	1520
	21st to end	Night	23% 6% 16% 30% 20% 6%	1520
July	1st to 10th	Night	36% 6% 11% 26% 18% 3	2490
	11th to 20th	Night	21% 6% 15% 36% 20% 2	2763
	21st to end	Night	27% 7% 21% 32% 12% 1	2999
August	1st to 10th	Night	18% 6% 22% 29% 24% 2	2826
	11th to 20th	Night	33% 5% 11% 28% 21% 1	2873
	21st to end	Night	24% 6% 16% 34% 16% 4	3476
September	1st to 10th	Night	28% 4 12% 23% 26% 7%	1900
	11th to 20th	Night	29% 5% 10% 26% 24% 5%	1940
	21st to end	Night	29% 5% 9% 27% 27% 4	2156
October	1st to 10th	Night	27% 4 10% 25% 28% 6%	2280
	11th to 20th	Night	33% 4 6% 27% 22% 8%	2280
	21st to end	Night	37% 5% 8% 23% 23% 4	2508
November	1st to 10th	Night	28% 5% 13% 26% 22% 6%	2259
	11th to 20th	Night	35% 4 8% 26% 24% 4	2560
	21st to end	Night	42% 4 9% 26% 17% 2	2660
December	1st to 10th	Night	42% 5% 12% 26% 14% 1	2660
	11th to 20th	Night	43% 4 12% 28% 13% 1	3281
	21st to end	Night	62% 5% 9% 15% 8% 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	19% 16% 37% 23% 6%	270
	11th to 20th	Day	31% 15% 36% 16% 1	270
	21st to end	Day	16% 16% 43% 20% 5%	297
February	1st to 10th	Day	24% 15% 41% 17% 3	270
	11th to 20th	Day	19% 19% 39% 16% 7%	270
	21st to end	Day	18% 21% 41% 16% 3	225
March	1st to 10th	Day	17% 15% 50% 16% 3	270
	11th to 20th	Day	26% 13% 33% 24% 4	270
	21st to end	Day	33% 21% 29% 14% 3	297
April	1st to 10th	Day	18% 17% 33% 24% 6% 1	450
	11th to 20th	Day	19% 16% 35% 24% 6% 1	452
	21st to end	Day	22% 12% 33% 23% 8% 1	479
May	1st to 10th	Day	17% 13% 34% 26% 9% 1	653
	11th to 20th	Day	18% 10% 26% 29% 14% 3	675
	21st to end	Day	15% 7% 28% 28% 17% 5%	734
June	1st to 10th	Day	7% 3 20% 34% 26% 9%	680
	11th to 20th	Day	10% 2 23% 36% 24% 5%	680
	21st to end	Day	6% 5% 31% 36% 18% 4	680
July	1st to 10th	Day	10% 4 15% 25% 33% 13%	671
	11th to 20th	Day	6% 2 19% 33% 31% 9%	668
	21st to end	Day	8% 3 15% 32% 32% 10%	739
August	1st to 10th	Day	7% 1 16% 39% 30% 7%	676
	11th to 20th	Day	9% 3 18% 37% 26% 8%	641
	21st to end	Day	9% 2 12% 28% 37% 12%	539
September	1st to 10th	Day	11% 3 15% 34% 27% 10%	490
	11th to 20th	Day	8% 2 16% 34% 30% 10%	447
	21st to end	Day	9% 7% 25% 31% 20% 8%	300
October	1st to 10th	Day	15% 7% 27% 27% 17% 8%	300
	11th to 20th	Day	12% 17% 38% 22% 11% 1	300
	21st to end	Day	25% 16% 33% 19% 6%	330
November	1st to 10th	Day	15% 8% 37% 25% 11% 4	273
	11th to 20th	Day	16% 16% 32% 23% 10% 2	270
	21st to end	Day	23% 16% 27% 27% 6%	270
December	1st to 10th	Day	11% 17% 36% 25% 9% 2	270
	11th to 20th	Day	17% 17% 36% 24% 6%	270
	21st to end	Day	21% 22% 39% 16% 1	297
January	1st to 10th	Night	15% 13% 40% 25% 7%	950
	11th to 20th	Night	17% 14% 40% 23% 5% 1	950
	21st to end	Night	16% 13% 39% 28% 4	1045
February	1st to 10th	Night	18% 13% 40% 26% 3	950
	11th to 20th	Night	17% 14% 38% 28% 3	929
	21st to end	Night	19% 14% 43% 20% 3	618
March	1st to 10th	Night	18% 13% 39% 27% 3	570
	11th to 20th	Night	19% 10% 35% 30% 5% 1	570
	21st to end	Night	26% 12% 35% 23% 4	627
April	1st to 10th	Night	15% 12% 38% 31% 5%	570
	11th to 20th	Night	17% 13% 32% 30% 8%	563
	21st to end	Night	18% 9% 38% 28% 8%	570
May	1st to 10th	Night	15% 7% 33% 35% 8% 1	570
	11th to 20th	Night	16% 4 27% 36% 15% 1	561
	21st to end	Night	13% 5% 27% 33% 20% 2	617
June	1st to 10th	Night	7% 3 19% 46% 22% 3	570
	11th to 20th	Night	5% 2 24% 46% 22% 2	570
	21st to end	Night	3 3 27% 45% 21% 1	570
July	1st to 10th	Night	10% 3 10% 41% 32% 4	555
	11th to 20th	Night	5% 1 14% 43% 34% 2	552
	21st to end	Night	7% 2 12% 43% 35% 2	624
August	1st to 10th	Night	4 3 14% 46% 32% 2	567
	11th to 20th	Night	7% 3 13% 41% 33% 3	564
	21st to end	Night	6% 1 11% 40% 40% 3	627
September	1st to 10th	Night	11% 2 15% 39% 28% 4	570
	11th to 20th	Night	12% 2 17% 37% 28% 5%	570
	21st to end	Night	9% 5% 23% 38% 23% 3	636
October	1st to 10th	Night	11% 5% 27% 33% 21% 3	760
	11th to 20th	Night	16% 9% 34% 33% 8%	760
	21st to end	Night	20% 11% 33% 28% 8%	836
November	1st to 10th	Night	13% 8% 32% 36% 10%	745
	11th to 20th	Night	14% 12% 37% 29% 8%	850
	21st to end	Night	20% 9% 37% 29% 5%	950
December	1st to 10th	Night	17% 10% 40% 26% 6% 1	950
	11th to 20th	Night	20% 10% 33% 31% 5%	950
	21st to end	Night	21% 14% 37% 25% 3	1045

Page generated at 2024-10-30 00:22:53. Version ac07

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