Loveland
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Loveland clear sky chart from 2005-11-06 to 2025-11-18.

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% 9% 3 8% 5% 4 5% 4 5% 7% 36%	127174
	Night	15% 10% 3 8% 5% 4 4 3 5% 7% 36%	123157
Transparency	Day	45% 6% 11% 22% 14% 1	130827
	Night	46% 5% 10% 22% 14% 2	127574
Seeing	Day	18% 12% 27% 22% 15% 6%	16701
	Night	18% 9% 27% 29% 15% 2	26275

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% 18% 9% 12% 4 3 3 3 4 4 25%	3656
	11th to 20th	Day	14% 15% 5% 14% 6% 7% 5% 3 3 4 25%	4060
	21st to end	Day	22% 12% 7% 9% 5% 5% 4 3 4 4 24%	4466
February	1st to 10th	Day	19% 14% 5% 9% 5% 4 3 3 4 5% 29%	1890
	11th to 20th	Day	17% 11% 4 11% 6% 5% 4 3 4 5% 30%	1948
	21st to end	Day	18% 14% 4 9% 5% 4 3 3 4 5% 30%	1650
March	1st to 10th	Day	18% 16% 6% 9% 5% 4 4 2 4 4 31%	4541
	11th to 20th	Day	13% 9% 3 7% 4 4 4 3 5% 7% 40%	4980
	21st to end	Day	18% 10% 3 7% 4 4 5% 4 5% 7% 33%	5465
April	1st to 10th	Day	16% 10% 3 7% 4 4 4 4 5% 7% 34%	2345
	11th to 20th	Day	15% 9% 3 8% 5% 4 3 3 4 7% 38%	2439
	21st to end	Day	17% 8% 3 8% 4 5% 4 4 5% 7% 36%	2600
May	1st to 10th	Day	19% 9% 3 8% 5% 5% 5% 4 6% 7% 28%	5862
	11th to 20th	Day	19% 8% 3 7% 4 4 4 4 5% 7% 34%	5861
	21st to end	Day	14% 6% 2 7% 5% 5% 6% 5% 7% 9% 32%	6433
June	1st to 10th	Day	12% 6% 2 6% 5% 5% 6% 5% 6% 8% 40%	2600
	11th to 20th	Day	10% 6% 2 7% 4 4 5% 4 7% 9% 43%	2769
	21st to end	Day	8% 6% 3 7% 5% 5% 5% 4 7% 10% 40%	2800
July	1st to 10th	Day	10% 6% 3 7% 5% 5% 4 4 7% 10% 41%	6360
	11th to 20th	Day	10% 6% 3 6% 5% 5% 6% 4 7% 11% 37%	6068
	21st to end	Day	10% 7% 3 8% 6% 6% 7% 6% 7% 9% 31%	6424
August	1st to 10th	Day	9% 5% 2 5% 4 4 5% 4 7% 10% 44%	4234
	11th to 20th	Day	7% 6% 3 6% 5% 4 5% 5% 7% 10% 42%	4174
	21st to end	Day	6% 4 1 5% 4 3 4 3 5% 8% 55%	4363
September	1st to 10th	Day	11% 6% 2 5% 3 4 4 3 6% 6% 50%	2268
	11th to 20th	Day	9% 4 2 5% 4 4 4 4 7% 8% 49%	2200
	21st to end	Day	16% 5% 2 7% 4 3 3 3 4 6% 46%	2200
October	1st to 10th	Day	10% 5% 2 6% 4 4 5% 4 5% 6% 50%	2200
	11th to 20th	Day	13% 7% 2 6% 4 4 4 3 5% 6% 47%	2020
	21st to end	Day	19% 9% 2 6% 4 3 4 3 4 7% 38%	2060
November	1st to 10th	Day	10% 6% 2 6% 4 3 3 3 4 6% 51%	1852
	11th to 20th	Day	14% 12% 4 7% 4 4 4 3 6% 6% 36%	1863
	21st to end	Day	18% 11% 4 8% 5% 4 3 3 4 6% 35%	1800
December	1st to 10th	Day	18% 9% 4 8% 5% 4 3 3 4 5% 37%	2930
	11th to 20th	Day	18% 15% 5% 9% 5% 5% 5% 3 4 5% 26%	3373
	21st to end	Day	21% 20% 4 10% 5% 5% 4 3 4 5% 18%	4420
January	1st to 10th	Night	16% 16% 7% 15% 7% 4 4 3 4 5% 19%	6278
	11th to 20th	Night	14% 17% 6% 13% 7% 5% 6% 3 4 5% 21%	5900
	21st to end	Night	21% 13% 4 9% 5% 4 3 2 3 5% 30%	6490
February	1st to 10th	Night	21% 12% 4 9% 4 4 4 4 5% 5% 28%	2505
	11th to 20th	Night	18% 12% 4 9% 5% 4 5% 3 6% 5% 30%	2338
	21st to end	Night	20% 14% 5% 7% 3 4 3 3 4 5% 31%	1980
March	1st to 10th	Night	19% 13% 3 6% 4 4 3 3 4 5% 37%	5310
	11th to 20th	Night	12% 7% 2 7% 4 4 5% 4 5% 7% 43%	4980
	21st to end	Night	17% 10% 3 8% 5% 4 4 4 5% 6% 34%	5467
April	1st to 10th	Night	17% 9% 3 6% 4 4 4 4 5% 7% 37%	2070
	11th to 20th	Night	14% 9% 2 6% 4 4 4 4 7% 7% 41%	1908
	21st to end	Night	16% 7% 2 7% 5% 5% 3 3 6% 8% 37%	1800
May	1st to 10th	Night	21% 11% 3 7% 5% 5% 5% 4 6% 7% 27%	4033
	11th to 20th	Night	16% 7% 3 6% 4 4 5% 4 7% 9% 34%	4032
	21st to end	Night	13% 7% 2 7% 5% 5% 4 4 6% 9% 38%	4421
June	1st to 10th	Night	8% 6% 2 5% 4 5% 4 4 5% 8% 49%	1800
	11th to 20th	Night	9% 5% 1 5% 4 3 4 4 7% 11% 46%	1625
	21st to end	Night	6% 4 3 4 5% 5% 5% 5% 7% 10% 47%	1600
July	1st to 10th	Night	9% 5% 2 6% 4 4 4 3 6% 8% 48%	3618
	11th to 20th	Night	8% 6% 2 6% 5% 5% 4 5% 7% 10% 42%	3879
	21st to end	Night	9% 6% 2 7% 5% 5% 5% 4 7% 10% 39%	4427
August	1st to 10th	Night	8% 6% 2 7% 5% 4 5% 4 7% 8% 45%	2915
	11th to 20th	Night	7% 7% 3 6% 5% 4 4 4 6% 9% 45%	2875
	21st to end	Night	4 3 1 4 3 4 3 4 6% 9% 59%	3518
September	1st to 10th	Night	11% 5% 2 5% 3 4 4 2 5% 6% 53%	2111
	11th to 20th	Night	8% 5% 2 5% 4 3 4 3 4 7% 55%	2200
	21st to end	Night	15% 6% 2 6% 3 3 4 2 4 5% 49%	2200
October	1st to 10th	Night	8% 4 2 6% 4 4 3 3 5% 6% 55%	2200
	11th to 20th	Night	13% 7% 2 6% 4 3 4 3 5% 7% 46%	2378
	21st to end	Night	19% 8% 3 6% 4 3 4 3 5% 6% 41%	2775
November	1st to 10th	Night	13% 7% 2 6% 4 3 3 3 5% 6% 47%	2666
	11th to 20th	Night	16% 9% 3 6% 4 3 4 3 4 6% 41%	2692
	21st to end	Night	19% 12% 3 8% 5% 4 4 3 5% 6% 31%	2600
December	1st to 10th	Night	17% 11% 4 8% 4 4 3 2 4 5% 37%	4250
	11th to 20th	Night	19% 15% 6% 9% 5% 4 3 3 4 5% 26%	4822
	21st to end	Night	22% 19% 6% 11% 6% 5% 4 3 4 5% 17%	6494

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	63% 3 10% 16% 7%	3657
	11th to 20th	Day	63% 4 9% 13% 9% 2	4060
	21st to end	Day	64% 3 9% 15% 7% 1	4466
February	1st to 10th	Day	59% 4 10% 17% 9% 1	1890
	11th to 20th	Day	58% 3 10% 17% 10% 1	1958
	21st to end	Day	56% 5% 9% 20% 9% 1	1650
March	1st to 10th	Day	57% 4 7% 19% 11% 2	4541
	11th to 20th	Day	42% 5% 9% 28% 15% 1	4980
	21st to end	Day	49% 5% 12% 21% 11% 2	5465
April	1st to 10th	Day	48% 6% 10% 22% 12% 1	2345
	11th to 20th	Day	46% 6% 10% 22% 14% 3	2439
	21st to end	Day	48% 6% 10% 23% 11% 2	2600
May	1st to 10th	Day	52% 8% 12% 18% 10% 1	5897
	11th to 20th	Day	49% 7% 11% 23% 10%	5865
	21st to end	Day	43% 9% 13% 22% 12% 1	6447
June	1st to 10th	Day	40% 9% 11% 22% 17% 2	2600
	11th to 20th	Day	36% 8% 14% 23% 18% 1	2769
	21st to end	Day	38% 8% 15% 21% 14% 4	2800
July	1st to 10th	Day	37% 7% 12% 26% 18% 1	6291
	11th to 20th	Day	39% 8% 14% 26% 13% 1	5995
	21st to end	Day	45% 8% 13% 19% 13% 2	6240
August	1st to 10th	Day	33% 8% 16% 31% 11% 1	4221
	11th to 20th	Day	35% 7% 11% 32% 15% 1	4213
	21st to end	Day	26% 6% 15% 30% 20% 3	4362
September	1st to 10th	Day	34% 6% 11% 25% 20% 5%	2268
	11th to 20th	Day	31% 6% 12% 25% 23% 3	2200
	21st to end	Day	40% 4 10% 23% 22% 2	2200
October	1st to 10th	Day	23% 4 9% 31% 31% 2	3590
	11th to 20th	Day	30% 3 9% 30% 26% 2	3273
	21st to end	Day	36% 3 11% 24% 24% 2	3310
November	1st to 10th	Day	35% 5% 10% 28% 20% 2	1852
	11th to 20th	Day	48% 4 9% 21% 15% 3	1863
	21st to end	Day	51% 3 10% 22% 13% 1	1800
December	1st to 10th	Day	51% 3 11% 26% 9%	2930
	11th to 20th	Day	62% 5% 8% 18% 7%	3370
	21st to end	Day	68% 4 10% 12% 5%	4420
January	1st to 10th	Night	67% 5% 7% 13% 7%	6278
	11th to 20th	Night	66% 5% 8% 11% 8% 2	5900
	21st to end	Night	58% 3 9% 20% 9% 1	6490
February	1st to 10th	Night	58% 4 10% 19% 7% 1	2505
	11th to 20th	Night	56% 5% 9% 18% 11% 1	2339
	21st to end	Night	56% 4 11% 17% 10% 2	1980
March	1st to 10th	Night	50% 4 6% 27% 11% 2	5310
	11th to 20th	Night	39% 6% 11% 28% 16% 1	4980
	21st to end	Night	51% 4 8% 24% 11% 2	5467
April	1st to 10th	Night	46% 6% 11% 23% 12% 2	2070
	11th to 20th	Night	41% 5% 11% 19% 18% 5%	1908
	21st to end	Night	45% 5% 12% 22% 14% 3	1800
May	1st to 10th	Night	54% 9% 9% 17% 8% 3	4060
	11th to 20th	Night	44% 9% 14% 23% 10% 1	4033
	21st to end	Night	39% 8% 16% 23% 11% 3	4429
June	1st to 10th	Night	32% 7% 11% 27% 21% 2	1800
	11th to 20th	Night	30% 8% 16% 22% 20% 4	1625
	21st to end	Night	30% 10% 17% 22% 17% 5%	1600
July	1st to 10th	Night	34% 7% 11% 24% 20% 4	3580
	11th to 20th	Night	35% 8% 15% 26% 14% 1	3833
	21st to end	Night	38% 8% 13% 24% 15% 3	4297
August	1st to 10th	Night	34% 8% 14% 31% 12% 1	2904
	11th to 20th	Night	35% 7% 11% 28% 18% 1	2902
	21st to end	Night	21% 7% 15% 32% 22% 3	3518
September	1st to 10th	Night	31% 6% 12% 25% 20% 7%	2111
	11th to 20th	Night	28% 6% 10% 23% 29% 3	2200
	21st to end	Night	37% 5% 9% 21% 26% 2	2200
October	1st to 10th	Night	22% 3 8% 27% 37% 2	3590
	11th to 20th	Night	28% 4 10% 25% 31% 3	3864
	21st to end	Night	33% 4 8% 23% 27% 5%	4475
November	1st to 10th	Night	38% 4 11% 21% 22% 3	2666
	11th to 20th	Night	44% 4 9% 23% 17% 3	2692
	21st to end	Night	54% 4 10% 20% 10% 1	2600
December	1st to 10th	Night	50% 4 12% 24% 10%	4250
	11th to 20th	Night	60% 5% 10% 18% 7% 1	4824
	21st to end	Night	70% 5% 9% 14% 3	6494

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	26% 22% 34% 14% 4	300
	11th to 20th	Day	26% 25% 36% 10% 3	300
	21st to end	Day	30% 22% 32% 15% 2	330
February	1st to 10th	Day	29% 23% 32% 13% 2	300
	11th to 20th	Day	30% 25% 34% 10% 1	300
	21st to end	Day	28% 20% 44% 7% 1	249
March	1st to 10th	Day	25% 26% 35% 12% 2	322
	11th to 20th	Day	25% 18% 34% 18% 5%	500
	21st to end	Day	32% 18% 29% 16% 5%	550
April	1st to 10th	Day	22% 19% 30% 20% 8% 1	500
	11th to 20th	Day	22% 20% 27% 18% 10% 3	492
	21st to end	Day	22% 15% 34% 17% 9% 2	500
May	1st to 10th	Day	24% 14% 33% 18% 8% 4	503
	11th to 20th	Day	20% 11% 26% 23% 14% 5%	527
	21st to end	Day	14% 8% 27% 27% 16% 9%	573
June	1st to 10th	Day	12% 8% 22% 30% 21% 7%	530
	11th to 20th	Day	12% 5% 22% 31% 23% 6%	699
	21st to end	Day	9% 5% 25% 32% 20% 9%	730
July	1st to 10th	Day	12% 4 17% 25% 24% 18%	721
	11th to 20th	Day	9% 4 22% 28% 26% 11%	597
	21st to end	Day	11% 3 17% 30% 24% 14%	576
August	1st to 10th	Day	11% 3 14% 27% 29% 15%	526
	11th to 20th	Day	10% 5% 19% 28% 26% 12%	519
	21st to end	Day	9% 4 15% 30% 28% 14%	583
September	1st to 10th	Day	11% 5% 18% 26% 30% 11%	530
	11th to 20th	Day	10% 3 15% 24% 33% 15%	530
	21st to end	Day	19% 8% 21% 24% 20% 9%	530
October	1st to 10th	Day	9% 6% 24% 32% 21% 8%	530
	11th to 20th	Day	16% 13% 31% 23% 14% 3	530
	21st to end	Day	23% 14% 36% 21% 6%	443
November	1st to 10th	Day	15% 15% 34% 23% 10% 3	330
	11th to 20th	Day	23% 21% 30% 18% 6% 2	321
	21st to end	Day	22% 19% 40% 16% 3	300
December	1st to 10th	Day	22% 21% 36% 16% 5%	300
	11th to 20th	Day	21% 22% 39% 13% 5%	300
	21st to end	Day	29% 20% 34% 15% 2	330
January	1st to 10th	Night	22% 18% 34% 21% 4	969
	11th to 20th	Night	28% 17% 33% 20% 3	800
	21st to end	Night	23% 16% 36% 23% 3	880
February	1st to 10th	Night	28% 12% 34% 24% 2	800
	11th to 20th	Night	25% 16% 36% 21% 2	783
	21st to end	Night	28% 14% 36% 21% 2	660
March	1st to 10th	Night	21% 15% 35% 24% 5%	800
	11th to 20th	Night	23% 13% 35% 23% 6% 1	800
	21st to end	Night	24% 11% 34% 25% 6%	880
April	1st to 10th	Night	20% 13% 33% 26% 7%	670
	11th to 20th	Night	19% 11% 32% 26% 10% 1	593
	21st to end	Night	18% 9% 38% 27% 7% 1	600
May	1st to 10th	Night	22% 8% 31% 28% 11% 1	600
	11th to 20th	Night	18% 5% 24% 34% 18% 2	591
	21st to end	Night	10% 2 24% 36% 23% 4	650
June	1st to 10th	Night	10% 3 20% 42% 24% 1	600
	11th to 20th	Night	11% 3 16% 43% 26% 2	600
	21st to end	Night	7% 2 20% 42% 26% 3	600
July	1st to 10th	Night	11% 2 12% 35% 32% 8%	585
	11th to 20th	Night	7% 2 15% 37% 35% 4	582
	21st to end	Night	10% 3 11% 38% 33% 4	657
August	1st to 10th	Night	8% 3 11% 40% 35% 3	597
	11th to 20th	Night	10% 1 13% 41% 30% 5%	594
	21st to end	Night	7% 1 13% 36% 36% 7%	660
September	1st to 10th	Night	13% 2 14% 35% 32% 4	711
	11th to 20th	Night	9% 2 15% 35% 33% 6%	800
	21st to end	Night	16% 6% 22% 31% 24% 2	800
October	1st to 10th	Night	11% 4 23% 35% 24% 4	800
	11th to 20th	Night	17% 8% 27% 33% 14% 1	800
	21st to end	Night	22% 9% 33% 25% 10%	880
November	1st to 10th	Night	17% 8% 31% 29% 14% 1	820
	11th to 20th	Night	19% 16% 30% 25% 9% 1	829
	21st to end	Night	25% 12% 27% 28% 7% 1	800
December	1st to 10th	Night	26% 12% 33% 23% 5%	800
	11th to 20th	Night	25% 12% 34% 23% 6% 1	800
	21st to end	Night	29% 15% 32% 22% 3	884

Page generated at 2025-11-15 00:55:56. Version ac07

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