Lovelady
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lovelady clear sky chart from 2005-11-06 to 2024-12-06.

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% 6% 2 6% 4 4 4 4 6% 8% 43%	101405
	Night	13% 6% 2 5% 4 3 4 3 5% 7% 49%	98396
Transparency	Day	37% 7% 12% 20% 18% 7%	105093
	Night	33% 6% 11% 20% 20% 10%	102835
Seeing	Day	12% 6% 20% 26% 25% 10%	15073
	Night	14% 6% 24% 34% 20% 2	24944

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	17% 9% 2 4 3 3 3 3 5% 6% 45%	2847
	11th to 20th	Day	19% 7% 1 4 3 2 2 2 3 5% 50%	2850
	21st to end	Day	23% 10% 2 6% 3 2 2 2 4 6% 40%	3135
February	1st to 10th	Day	22% 8% 3 6% 5% 3 3 2 4 5% 39%	1762
	11th to 20th	Day	21% 9% 3 6% 4 3 3 2 4 4 40%	1849
	21st to end	Day	21% 8% 2 5% 4 3 3 2 3 6% 42%	1718
March	1st to 10th	Day	17% 13% 4 8% 5% 4 4 3 5% 5% 31%	3436
	11th to 20th	Day	20% 7% 2 7% 4 5% 4 4 6% 7% 32%	3480
	21st to end	Day	16% 9% 3 7% 5% 4 4 4 5% 6% 38%	3814
April	1st to 10th	Day	14% 8% 3 7% 5% 4 4 3 5% 7% 40%	2090
	11th to 20th	Day	14% 8% 3 7% 5% 5% 4 4 5% 7% 39%	2225
	21st to end	Day	11% 6% 2 6% 4 5% 6% 4 5% 6% 45%	2280
May	1st to 10th	Day	18% 8% 4 8% 6% 5% 5% 4 6% 8% 29%	3947
	11th to 20th	Day	14% 6% 2 6% 4 4 5% 4 5% 7% 42%	4082
	21st to end	Day	10% 6% 3 7% 6% 6% 6% 5% 8% 10% 33%	4477
June	1st to 10th	Day	6% 4 2 7% 6% 6% 6% 5% 7% 11% 41%	2470
	11th to 20th	Day	4 4 2 5% 5% 5% 6% 5% 7% 10% 47%	2470
	21st to end	Day	6% 5% 2 7% 6% 6% 6% 5% 8% 11% 39%	2470
July	1st to 10th	Day	9% 4 2 5% 4 5% 6% 5% 8% 12% 41%	4120
	11th to 20th	Day	6% 5% 2 7% 5% 6% 5% 5% 8% 10% 42%	4120
	21st to end	Day	15% 7% 2 7% 6% 6% 5% 5% 6% 9% 33%	4465
August	1st to 10th	Day	3 1 1 2 3 3 3 3 5% 9% 67%	4104
	11th to 20th	Day	3 2 1 4 3 3 4 4 7% 12% 56%	3927
	21st to end	Day	6% 4 2 5% 5% 5% 6% 5% 8% 11% 42%	4154
September	1st to 10th	Day	6% 5% 2 6% 5% 5% 6% 5% 7% 8% 44%	2090
	11th to 20th	Day	11% 5% 3 7% 5% 4 6% 5% 6% 7% 42%	2090
	21st to end	Day	6% 4 1 5% 4 4 6% 4 6% 8% 53%	2090
October	1st to 10th	Day	6% 3 1 4 3 4 4 4 4 6% 61%	1969
	11th to 20th	Day	11% 5% 2 4 3 3 3 3 4 5% 56%	1900
	21st to end	Day	14% 5% 2 4 3 3 3 2 3 6% 57%	2090
November	1st to 10th	Day	12% 6% 2 6% 5% 4 4 3 4 6% 48%	1958
	11th to 20th	Day	11% 7% 2 6% 4 4 3 3 4 6% 53%	2000
	21st to end	Day	16% 7% 2 6% 4 3 3 3 4 5% 45%	1875
December	1st to 10th	Day	15% 8% 2 6% 3 3 4 3 4 6% 46%	1755
	11th to 20th	Day	17% 8% 2 5% 4 4 4 3 5% 5% 42%	2161
	21st to end	Day	16% 9% 3 7% 4 3 4 3 4 4 43%	3135
January	1st to 10th	Night	17% 6% 2 5% 3 3 3 2 4 5% 51%	4108
	11th to 20th	Night	18% 6% 1 4 3 2 3 2 3 4 53%	4120
	21st to end	Night	22% 11% 2 5% 3 2 3 2 4 6% 41%	4532
February	1st to 10th	Night	17% 9% 2 6% 4 4 3 2 4 5% 43%	2432
	11th to 20th	Night	20% 7% 2 5% 3 4 3 2 3 5% 45%	2218
	21st to end	Night	19% 7% 2 6% 3 3 3 2 3 6% 45%	1733
March	1st to 10th	Night	23% 10% 3 6% 4 3 4 3 4 5% 36%	3419
	11th to 20th	Night	20% 8% 3 7% 4 4 4 4 5% 6% 34%	3480
	21st to end	Night	14% 7% 3 7% 5% 4 4 3 4 4 44%	3817
April	1st to 10th	Night	12% 6% 3 6% 4 3 4 4 6% 7% 46%	2090
	11th to 20th	Night	13% 6% 3 6% 4 4 4 3 6% 7% 45%	1902
	21st to end	Night	12% 7% 2 6% 4 3 3 3 5% 7% 50%	1900
May	1st to 10th	Night	17% 9% 3 7% 5% 3 4 3 5% 9% 35%	2949
	11th to 20th	Night	12% 6% 3 7% 4 4 4 4 5% 6% 44%	2823
	21st to end	Night	11% 6% 2 6% 4 4 5% 4 7% 10% 42%	3090
June	1st to 10th	Night	4 4 2 5% 3 3 4 4 6% 11% 55%	1710
	11th to 20th	Night	3 2 1 3 3 4 3 4 5% 10% 62%	1710
	21st to end	Night	5% 5% 2 5% 4 4 5% 5% 8% 10% 49%	1710
July	1st to 10th	Night	7% 4 2 5% 4 4 5% 5% 7% 12% 46%	2850
	11th to 20th	Night	3 3 2 4 4 4 6% 5% 7% 10% 52%	2850
	21st to end	Night	12% 8% 2 6% 5% 4 5% 3 7% 9% 39%	3098
August	1st to 10th	Night	2 1 1 1 1 2 2 5% 9% 76%	2836
	11th to 20th	Night	3 2 1 2 3 3 4 4 7% 12% 59%	2905
	21st to end	Night	5% 4 1 5% 5% 4 6% 4 8% 10% 49%	3496
September	1st to 10th	Night	5% 6% 3 6% 4 4 4 4 6% 8% 50%	2090
	11th to 20th	Night	9% 6% 2 7% 4 4 4 4 5% 6% 48%	2090
	21st to end	Night	7% 4 2 3 3 3 3 3 5% 9% 58%	2090
October	1st to 10th	Night	4 3 2 4 4 2 3 3 5% 7% 63%	2190
	11th to 20th	Night	11% 4 1 3 2 2 3 3 4 5% 61%	2280
	21st to end	Night	13% 5% 2 3 2 2 2 3 3 4 61%	2508
November	1st to 10th	Night	13% 5% 1 4 3 3 2 3 5% 6% 55%	2340
	11th to 20th	Night	10% 6% 2 5% 4 3 3 3 4 7% 53%	2400
	21st to end	Night	15% 7% 2 5% 4 3 3 3 4 5% 47%	2520
December	1st to 10th	Night	17% 7% 2 5% 3 3 4 3 5% 6% 46%	2542
	11th to 20th	Night	16% 9% 3 6% 3 3 3 3 4 5% 45%	3036
	21st to end	Night	16% 7% 2 5% 4 3 3 3 3 5% 50%	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	38% 6% 7% 18% 26% 6%	2848
	11th to 20th	Day	37% 3 5% 21% 28% 5%	2850
	21st to end	Day	46% 4 4 18% 18% 10%	3135
February	1st to 10th	Day	48% 4 6% 14% 19% 9%	1762
	11th to 20th	Day	49% 4 6% 14% 18% 9%	1859
	21st to end	Day	44% 5% 7% 15% 17% 11%	1718
March	1st to 10th	Day	52% 7% 8% 11% 18% 4	3436
	11th to 20th	Day	47% 8% 10% 16% 15% 4	3480
	21st to end	Day	44% 7% 10% 16% 20% 3	3814
April	1st to 10th	Day	44% 6% 8% 17% 15% 8%	2090
	11th to 20th	Day	43% 7% 10% 15% 16% 9%	2225
	21st to end	Day	37% 7% 8% 19% 23% 5%	2280
May	1st to 10th	Day	50% 9% 13% 16% 9% 4	3982
	11th to 20th	Day	39% 8% 11% 16% 25% 2	4086
	21st to end	Day	40% 11% 15% 22% 12% 1	4489
June	1st to 10th	Day	34% 9% 16% 25% 14% 1	2470
	11th to 20th	Day	30% 9% 15% 27% 15% 3	2470
	21st to end	Day	36% 10% 16% 23% 13% 1	2470
July	1st to 10th	Day	33% 10% 26% 26% 5%	4056
	11th to 20th	Day	34% 9% 16% 28% 12%	4051
	21st to end	Day	46% 9% 16% 22% 7%	4325
August	1st to 10th	Day	14% 5% 15% 37% 27% 2	4090
	11th to 20th	Day	19% 7% 24% 39% 9% 1	3966
	21st to end	Day	32% 12% 19% 22% 13% 2	4153
September	1st to 10th	Day	34% 10% 14% 19% 16% 8%	2090
	11th to 20th	Day	39% 9% 12% 17% 16% 7%	2090
	21st to end	Day	28% 7% 11% 21% 19% 13%	2090
October	1st to 10th	Day	15% 3 6% 13% 22% 41%	3268
	11th to 20th	Day	19% 3 4 20% 33% 21%	3140
	21st to end	Day	25% 4 4 17% 37% 13%	3428
November	1st to 10th	Day	36% 6% 9% 18% 22% 9%	1958
	11th to 20th	Day	34% 4 8% 18% 23% 13%	2000
	21st to end	Day	41% 5% 8% 18% 19% 9%	1875
December	1st to 10th	Day	40% 5% 11% 17% 19% 8%	1755
	11th to 20th	Day	43% 5% 6% 15% 21% 9%	2159
	21st to end	Day	44% 5% 6% 13% 24% 8%	3135
January	1st to 10th	Night	36% 4 7% 18% 24% 11%	4108
	11th to 20th	Night	35% 5% 6% 16% 29% 10%	4120
	21st to end	Night	46% 4 5% 15% 19% 11%	4532
February	1st to 10th	Night	44% 4 5% 15% 17% 15%	2432
	11th to 20th	Night	43% 5% 6% 15% 20% 12%	2218
	21st to end	Night	43% 4 9% 13% 16% 16%	1733
March	1st to 10th	Night	50% 6% 8% 13% 16% 7%	3419
	11th to 20th	Night	48% 8% 9% 14% 16% 5%	3480
	21st to end	Night	40% 7% 10% 14% 22% 7%	3817
April	1st to 10th	Night	37% 7% 10% 18% 16% 12%	2090
	11th to 20th	Night	37% 6% 10% 19% 16% 12%	1902
	21st to end	Night	35% 6% 10% 19% 24% 7%	1900
May	1st to 10th	Night	44% 9% 12% 20% 12% 4	2979
	11th to 20th	Night	37% 9% 10% 18% 23% 3	2824
	21st to end	Night	33% 12% 16% 26% 12% 1	3099
June	1st to 10th	Night	23% 9% 20% 30% 17% 1	1710
	11th to 20th	Night	18% 7% 19% 33% 18% 5%	1710
	21st to end	Night	27% 9% 16% 30% 16% 2	1710
July	1st to 10th	Night	30% 9% 30% 27% 5%	2805
	11th to 20th	Night	25% 9% 21% 32% 12%	2796
	21st to end	Night	41% 9% 21% 22% 7%	2999
August	1st to 10th	Night	8% 5% 17% 36% 33% 2	2826
	11th to 20th	Night	17% 6% 25% 41% 10% 1	2932
	21st to end	Night	28% 11% 20% 25% 13% 2	3496
September	1st to 10th	Night	30% 9% 17% 20% 15% 9%	2090
	11th to 20th	Night	36% 8% 15% 18% 16% 7%	2090
	21st to end	Night	24% 7% 13% 20% 24% 13%	2090
October	1st to 10th	Night	14% 3 6% 15% 19% 43%	3658
	11th to 20th	Night	15% 3 4 20% 32% 26%	3779
	21st to end	Night	23% 3 4 15% 37% 17%	4120
November	1st to 10th	Night	30% 6% 10% 19% 23% 11%	2340
	11th to 20th	Night	32% 5% 9% 18% 23% 14%	2400
	21st to end	Night	39% 4 9% 15% 21% 11%	2520
December	1st to 10th	Night	39% 5% 9% 19% 19% 9%	2542
	11th to 20th	Night	43% 4 7% 12% 22% 13%	3037
	21st to end	Night	38% 4 6% 15% 28% 9%	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	26% 9% 36% 21% 6% 2	270
	11th to 20th	Day	24% 10% 34% 22% 8% 1	270
	21st to end	Day	21% 13% 37% 21% 7%	297
February	1st to 10th	Day	26% 14% 33% 21% 6%	270
	11th to 20th	Day	31% 15% 30% 19% 4	270
	21st to end	Day	27% 16% 42% 12% 3	225
March	1st to 10th	Day	24% 14% 37% 20% 6%	270
	11th to 20th	Day	15% 16% 45% 17% 6% 1	270
	21st to end	Day	16% 17% 38% 22% 6% 1	297
April	1st to 10th	Day	19% 15% 39% 24% 3	270
	11th to 20th	Day	20% 14% 30% 22% 13% 2	423
	21st to end	Day	15% 8% 33% 33% 10% 2	460
May	1st to 10th	Day	14% 11% 34% 29% 11% 1	567
	11th to 20th	Day	14% 5% 23% 34% 20% 3	675
	21st to end	Day	9% 5% 25% 35% 22% 5%	734
June	1st to 10th	Day	5% 3 11% 34% 35% 12%	680
	11th to 20th	Day	5% 2 11% 37% 35% 10%	680
	21st to end	Day	8% 2 11% 29% 35% 16%	680
July	1st to 10th	Day	7% 2 5% 29% 39% 19%	671
	11th to 20th	Day	3 1 5% 27% 43% 21%	668
	21st to end	Day	6% 1 6% 21% 46% 20%	739
August	1st to 10th	Day	4 3 22% 49% 22%	676
	11th to 20th	Day	7% 1 2 18% 48% 24%	603
	21st to end	Day	10% 2 4 17% 38% 29%	526
September	1st to 10th	Day	4 8% 25% 36% 26%	300
	11th to 20th	Day	7% 1 9% 24% 39% 20%	300
	21st to end	Day	9% 3 9% 25% 35% 19%	300
October	1st to 10th	Day	5% 1 17% 35% 29% 13%	300
	11th to 20th	Day	8% 7% 22% 38% 16% 9%	300
	21st to end	Day	21% 10% 24% 21% 18% 6%	330
November	1st to 10th	Day	14% 8% 22% 33% 17% 5%	300
	11th to 20th	Day	17% 8% 26% 36% 12% 2	300
	21st to end	Day	17% 17% 31% 20% 13% 1	300
December	1st to 10th	Day	18% 7% 34% 23% 13% 5%	285
	11th to 20th	Day	26% 13% 29% 24% 7% 1	270
	21st to end	Day	23% 10% 38% 20% 7% 1	297
January	1st to 10th	Night	20% 9% 31% 33% 8%	950
	11th to 20th	Night	21% 10% 31% 29% 8%	950
	21st to end	Night	20% 10% 30% 35% 5%	1045
February	1st to 10th	Night	21% 11% 33% 29% 5%	912
	11th to 20th	Night	24% 8% 36% 28% 4	744
	21st to end	Night	21% 14% 40% 23% 2	477
March	1st to 10th	Night	20% 10% 35% 29% 5%	570
	11th to 20th	Night	18% 10% 37% 29% 6%	570
	21st to end	Night	16% 8% 40% 31% 5%	627
April	1st to 10th	Night	14% 9% 40% 31% 6%	570
	11th to 20th	Night	15% 10% 36% 29% 11%	563
	21st to end	Night	15% 9% 36% 28% 11% 1	570
May	1st to 10th	Night	11% 9% 40% 32% 8% 1	570
	11th to 20th	Night	12% 5% 29% 37% 16% 1	561
	21st to end	Night	6% 5% 24% 42% 21% 2	617
June	1st to 10th	Night	5% 2 12% 41% 36% 4	570
	11th to 20th	Night	2 2 15% 48% 31% 2	570
	21st to end	Night	6% 1 8% 42% 38% 5%	570
July	1st to 10th	Night	4 1 6% 40% 42% 7%	555
	11th to 20th	Night	4 1 6% 40% 43% 5%	552
	21st to end	Night	4 1 7% 37% 45% 5%	624
August	1st to 10th	Night	3 3 39% 50% 6%	567
	11th to 20th	Night	5% 1 4 38% 45% 6%	564
	21st to end	Night	6% 5% 31% 50% 8%	627
September	1st to 10th	Night	7% 1 7% 33% 44% 7%	570
	11th to 20th	Night	11% 1 7% 32% 43% 5%	570
	21st to end	Night	9% 2 11% 32% 41% 5%	570
October	1st to 10th	Night	5% 2 13% 41% 33% 6%	670
	11th to 20th	Night	11% 4 20% 42% 21% 3	760
	21st to end	Night	15% 6% 24% 34% 20% 2	836
November	1st to 10th	Night	14% 3 20% 39% 22% 1	780
	11th to 20th	Night	13% 8% 26% 39% 14%	800
	21st to end	Night	18% 10% 27% 30% 14% 1	920
December	1st to 10th	Night	19% 7% 29% 33% 11% 1	978
	11th to 20th	Night	24% 8% 30% 33% 6%	950
	21st to end	Night	20% 8% 31% 33% 8%	1045

Page generated at 2024-12-03 05:45:10. Version ac07

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